PT4820 Series 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 Features • Triple Outputs (Independently Regulated) • Input Voltage Range: 36V to 75V, 80V Surge • 1500VDC Isolation • Dual Logic On/Off Control • Short-Circuit Protection (All Outputs) • Fixed Frequency Operation • Over-Temperature Shutdown • Under-Voltage Lockout • Space Saving Package: 1.3 sq. in. PCB Area (suffix N) • Solderable Copper Case • Safety Approvals: UL60950 CSA 22.2 950 VDE EN60950 Ordering Information Description The PT4820 Excalibur™ power modules are a series of isolated tripleoutput DC/DC converters that operate from a standard (–48V) central office supply. Rated for up to 35W, these regulators are ideal for powering many mixed logic applications. The triple-output voltage combination allows for a compact multiple-output power supply in a single low-profile DC/DC module. The available output voltage options include a low-voltage power bus for a DSP or ASIC core, and two additional standard logic supply voltages. The PT4820 series incorporates many features to simplify system integration. These include a flexible On/Off enable control, an input under-voltage lock-out, and overtemperature protection. All outputs have short-circuit protection and are internally sequenced to meet the power-up and power-down requirements of popular DSP ICs. The PT4820 series is housed in a space-saving solderable case. The module requires no external heat sink and can occupy as little as 1.3 in2 of PCB area. PT4821o PT4822o PT4823o PT4824o PT4825o PT4826o PT4827o PT4828o PT4829o PT4831o PT4832o * PT4833o = = = = = = = = = = = = +3.3/+2.5/+1.5V +3.3/+1.8/+1.5V +3.3/+2.5/+1.2V +3.3/+1.8/+1.2V +3.3/+1.5/+1.2V +5.0/+3.3/+1.8V +3.3/+2.5/+1.8V +5.0/+2.5/+1.5V +5.0/+1.8/+1.5V +5.0/+3.3/+1.5V +5.0/+3.3/+2.5V +3.3/+2.0/+1.5V * The PT4833 is not included in the VDE safety certification. PT Series Suffix (PT1234 x ) Case/Pin Configuration Vertical Horizontal SMD Order Suffix Package Code N A C (ENM) (ENN) (ENP) (Reference the applicable package code drawing for the dimensions and PC layout) Typical Application PT4820 +Vo 1 +VIN 3 +V IN V1 Adj I/O 12,13 11 + Co 1 COM 9,10 +Vo 2 + CIN 1 V2 Adj Logic 16,17 15 + DSL, DSP, or ASIC Chipset Co 2 EN 1 COM 14 2 –VIN Cin Co1 , Co2, Co 3 EN1 & EN2 pins: = Optional = Optional; See specifications EN 2 +Vo 3 4 –V IN V3 Adj Core 20,21 19 + Co 3 COM 18 See On/Off Enable Logic For technical support and more information, see inside back cover or visit www.ti.com 1 PT4820 Series 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 Environmental Specifications Characteristics Symbols Ambient Temperature Range Case Temperature ShutdownTemperature Solder Reflow Temperature Storage Temperature Mechanical Shock Ta Tc OTP Treflow Ts Conditions Mechanical Vibration Weight Flammability — — Min Typ Max Units Over Vin Range Measured at center of case –40 — Surface temperature of module pins or case — Per Mil-STD-883D, Method 2002.3 1 msec, ½ Sine, mounted Mil-STD-883D, Method 2007.2 Suffix A, C 20-2000 Hz Vertical/Horizontal Meets UL 94V-O — –40 — — 115 — — +85 (i) +100 125 215 (ii) +125 °C °C °C °C °C — — 500 20 (iii) — — G’s — 50 — grams G’s Notes: (i) See SOA curves or consult factory for appropriate derating. (ii) During solder reflow of SMD package version, do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051). (iii) The case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing. Pin Configuration On/Off Enable Logic Pin Function Pin Function Pin 1 1 EN 1 12 Vo1 2 EN 2 13 Vo1 3 +Vin 14 COM 4 –Vin 15 Vo2 adjust 5 Do Not Connect 16 +Vo2 6 Pin Not Present 17 +Vo2 7 Pin Not Present 18 COM 8 Pin Not Present 19 Vo3 adjust 9 COM 20 +Vo3 10 COM 21 +Vo3 11 Vo1 Adjust Pin 2 Output Status × 1 Off 1 0 On 0 × Off Notes: Logic 1 =Open collector Logic 0 = –Vin (pin 2) potential For positive Enable function, connect pin 2 to pin 4 and use pin 1. For negative Enable function, leave pin 1 open and use pin 2. For automatice power-up connect pin 2 to pin 4 and leave pin 1 open. Note: Shaded functions indicates those pins that are at primary-side potential. All other pins are referenced to the secondary. Pin Descriptions +Vin: The positive input supply for the module with respect to –Vin. When powering the module from a –48V telecom central office supply, this input is connected to the primary system ground. –Vin: The negative input supply for the module, and the 0VDC reference for the EN 1, and EN 2 inputs. When powering the module from a +48V supply, this input is connected to the 48V(Return). EN 1: The positive logic input that activates the module output. If not used, this pin should be left open circuit. Connecting this input to –Vin disables the module’s outputs. EN 2: The negative logic input that activates the module output. This pin must be connected to –Vin to enable the module’s outputs. A high impedance disables the module’s outputs. Vo 1: The highest regulated output voltage, which is referenced to the COM node. Vo 2: The regulated output that is designed to power logic circuitry. It is referenced to the COM node. Vo 3: The low-voltage regulated output that provides power for a µ-processor or DSP core, and is referenced to the COM node. COM: The secondary return reference for the module’s three regulated output voltages. It is DC isolated from the input supply pins. Vo1 Adjust: Using a single resistor, this pin allows Vo1 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. Vo2 Adjust: Using a single resistor, this pin allows Vo2 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. Vo3 Adjust: Using a single resistor, this pin allows Vo3 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. For technical support and more information, see inside back cover or visit www.ti.com 2 PT4821—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4821 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) PT4821 Typ Max — — — — — — 3.3 2.5 1.5 ±0.5 ±0.5 ±0.1 ±0.1 — — 87 40 35 25 200 3 ±10 14 400 8 (2) 6 (2) 6 (2) 12 (2) 75 80 3.36 2.55 1.53 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 — — 35.5 34 — — V — 140 (4) — ms 4 –0.2 — — 15 0.8 Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =6A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 3.24 2.45 1.47 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing Turn-On Time ton Vin =48V step Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Min Io1 (3.3V) Io2 (2.5V) Io3 (1.5V) Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation Units µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo1, Vo2, and Vo3 not to exceed 12ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 3 Typical Characteristics PT4821—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4821 Performance Characteristics PT4821 Thermal Performance (See Notes A, B) (See Note C) (Io1 + Io2 + Io3 =12A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Load 8 90 80 VIN Pd - Watts Efficiency - % 6 VIN 36V 48V 75V 70 75V 48V 36V 4 2 60 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) Safe Operating Area @Vin =48V 90 Ambient Temperature (°C) 80 Efficiency - % 90 VIN 80 36V 48V 75V 70 60 200LFM 60 120LFM 60LFM Nat conv 50 40 30 20 50 0 20 40 60 80 0% 100 20% 40% 60% 80% 100% Output Load (%) Output Load (%) 100 Airflow 70 Output Ripple vs Output Power; Vin =48V (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 2.5V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 2.5V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 4 PT4822—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4822 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo PT4822 Typ Max — — — — — — 3.3 1.8 1.5 ±0.5 ±0.5 ±0.1 ±0.1 — — 86 40 25 25 200 3 ±10 14 400 8 (2) 6 (2) 6 (2) 12 (2) 75 80 3.36 1.84 1.53 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 Units Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =6A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 (1) 0.1 (1) 0.1 (1) — 36 — 3.24 1.76 1.47 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing — — 35.5 34 — — V Turn-On Time ton Vin =48V step — 140 (4) — ms 4 –0.2 — — 15 0.8 Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Io1 (3.3V) Io2 (1.8V) Io3 (1.5V) Min Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation A µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 5 Typical Characteristics PT4822—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4822 Performance Characteristics PT4822 Thermal Performance (See Note A, B) (See Note C) (Io1 + Io2 + Io3 =12A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Load 8 90 80 VIN Pd - Watts Efficiency - % 6 VIN 36V 48V 75V 70 75V 48V 36V 4 2 60 0 50 0 20 40 60 80 0 100 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) Safe Operating Area @Vin =48V 90 80 Ambient Temperature (°C) Efficiency - % 90 VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 50 20 0 20 40 60 80 100 0% Output Load (%) 100 20% 40% 60% 80% 100% Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 1.8V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 1.8V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 6 PT4823—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4823 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Min Max — — — — — — 3.3 2.5 1.2 ±0.5 ±0.5 ±0.1 ±0.1 — — 85.6 35 25 25 200 3 ±10 14 400 8 (2) 6 (2) 6 (2) 12 (2) 75 80 3.36 2.55 1.23 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 Units Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =6A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 3.24 2.45 1.17 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing — — 35.5 34 — — V Turn-On Time ton Vin =48V step — 140 (4) — ms 4 –0.2 — — 15 0.8 Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Io1 (3.3V) Io2 (2.5V) Io3 (1.2V) PT4823 Typ Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation A µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 7 Typical Characteristics PT4823—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4823 Performance Characteristics (See Notes A, B) PT4823 Thermal Performance (See Note C) (Io1 + Io2 + Io3 =12A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =8A, Io 2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Load 8 90 80 VIN Pd - Watts Efficiency - % 6 VIN 36V 48V 75V 70 75V 48V 36V 4 2 60 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =4A, Io 2 =4A, Io3 =4A represents 100% Load) Safe Operating Area @Vin =48V 90 80 Ambient Temperature (°C) Efficiency - % 90 VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 50 20 0 20 40 60 80 100 0% Output Load (%) 100 20% 40% 60% 80% 100% Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =8A, Io 2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 2.5V 3.3V 1.2V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =4A, Io 2 =4A, Io3 =4A represents 100% Load) 80 Ripple - mV VOUT 60 2.5V 3.3V 1.2V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 8 PT4824—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4824 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Min Max — — — — — — 3.3 1.8 1.2 ±0.5 ±0.5 ±0.1 ±0.1 — — 85 30 25 25 200 3 ±10 14 400 8 (2) 6 (2) 6 (2) 12 (2) 75 80 3.36 1.84 1.23 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 Units Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =6A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 3.24 1.76 1.17 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing — — 35.5 34 — — V Turn-On Time ton Vin =48V step — 140 (4) — ms 4 –0.2 — — 15 0.8 Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Io1 (3.3V) Io2 (1.8V) Io3 (1.2V) PT4824 Typ Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation A µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 9 Typical Characteristics PT4824—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4824 Performance Characteristics PT4824 Thermal Performance (See Notes A, B) (See Note C) (Io1 + Io2 + Io3 =12A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Load 8 90 6 80 VIN Pd - Watts Efficiency - % VIN 36V 48V 75V 70 36V 48V 75V 4 2 60 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) Safe Operating Area @Vin =48V 90 80 Ambient Temperature (°C) 90 Efficiency - % VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 50 20 0 20 40 60 80 100 0% Output Load (%) 100 20% 40% 60% 80% 100% Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 1.8V 1.2V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 1.8V 1.2V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 10 PT4825—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4825 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Min Max — — — — — — 3.3 1.5 1.2 ±0.5 ±0.5 ±0.1 ±0.1 — — 86 35 25 25 200 3 ±10 14 400 8 (2) 6 (2) 6 (2) 12 (2) 75 80 3.36 1.53 1.23 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 Units Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =6A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 3.24 1.47 1.17 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing — — 35.5 34 — — V Turn-On Time ton Vin =48V step — 140 (4) — ms 4 –0.2 — — 15 0.8 Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Io1 (3.3V) Io2 (1.5V) Io3 (1.2V) PT4825 Typ Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation A µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo1, Vo2, and Vo3 not to exceed 12ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 11 Typical Characteristics PT4825—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4825 Performance Characteristics (See Notes A, B) PT4825 Thermal Performance (See Note C) (Io1 + Io2 + Io3 =12A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Load 10 8 VIN 80 VIN Pd - Watts Efficiency - % 90 36V 48V 75V 70 60 6 36V 48V 75V 4 2 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) Safe Operating Area @Vin =48V 90 80 Ambient Temperature (°C) Efficiency - % 90 VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 50 20 0 20 40 60 80 100 0% Output Load (%) 100 20% 40% 60% 80% 100% Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 1.2V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 1.2V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 12 PT4826—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4826 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) PT4826 Typ Max — — — — — — 5.0 3.3 1.8 ±0.5 ±0.5 ±0.1 ±0.1 — — 87 40 35 25 200 5 ±10 11 400 5.0 (2) 5.5 (2) 5.5 (2) 9 (2) 75 80 5.1 3.36 1.84 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 — — 35.5 34 — — V — 140 (4) — ms 4 –0.2 — — 15 0.8 Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =5A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 4.9 3.24 1.76 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing Turn-On Time ton Vin =48V step Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Min Io1 (5.0V) Io2 (3.3V) Io3 (1.8V) Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation Units µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 9ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 13 Typical Characteristics PT4826—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4826 Performance Characteristics (See Notes A, B) PT4826 Thermal Performance (See Note C) (Io1 + Io2 + Io3 =9A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Load 10 90 8 80 VIN Pd - Watts Efficiency - % VIN 36V 48V 75V 70 60 6 75V 48V 36V 4 2 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load) Safe Operating Area @Vin =48V 90 80 Ambient Temperature (°C) 90 Efficiency - % VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 50 20 0 20 40 60 80 100 0% Output Load (%) 100 20% 40% 60% 80% 100% Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 1.8V 5V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 1.8V 5.0V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 14 PT4827—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4827 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Min Max — — — — — — 3.3 2.5 1.8 ±0.5 ±0.5 ±0.1 ±0.1 — — 86 40 35 25 200 3 ±10 14 400 8 (2) 6 (2) 6 (2) 12 (2) 75 80 3.36 2.55 1.84 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 Units Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =6A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 3.24 2.45 1.76 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing — — 35.5 34 — — V Turn-On Time ton Vin =48V step — 140 (4) — ms 4 –0.2 — — 15 0.8 Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Io1 (3.3V) Io2 (2.5V) Io3 (1.8V) PT4827 Typ Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation A µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 15 Typical Characteristics PT4827—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4827 Performance Characteristics PT4827 Thermal Performance (See Notes A, B) (See Note C) (Io1 + Io2 + Io3 =12A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Load 8 7 90 6 80 Pd - Watts Efficiency - % VIN 36V 48V 75V 70 5 75V 48V 36V 4 3 2 60 1 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) Safe Operating Area @Vin =48V 90 80 Ambient Temperature (°C) Efficiency - % 90 VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 50 20 0 20 40 60 80 100 0% Output Load (%) 100 20% 40% 60% 80% 100% Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 2.5V 1.8V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 2.5V 1.8V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 16 PT4828—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4828 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) PT4828 Typ Max — — — — — — 5.0 2.5 1.5 ±0.5 ±0.5 ±0.1 ±0.1 — — 86.5 30 30 25 200 5 ±10 11 400 5.0 (2) 5.5 (2) 5.5 (2) 9 (2) 75 80 5.1 2.55 1.53 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 — — 35.5 34 — — V — 140 (4) — ms 4 –0.2 — — 15 0.8 Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =5A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 4.9 2.45 1.47 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing Turn-On Time ton Vin =48V step Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Min Io1 (5.0V) Io2 (2.5V) Io3 (1.5V) Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation Units µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo2, and Vo3 cannot exceed 9ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 17 Typical Characteristics PT4828—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4828 Performance Characteristics (See Notes A, B) PT4828 Thermal Performance (See Note C) (Io1 + Io2 + Io3 =9A ,represents 100% Load) 100 Efficiency vs Output Power (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Load 10 90 8 80 VIN Pd - Watts Efficiency - % VIN 36V 48V 75V 70 60 6 75V 48V 36V 4 2 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io 1 =2A, Io2 =2A, Io3 =5A represents 100% Load) Safe Operating Area @Vin =48V 90 Ambient Temperature (°C) 80 90 Efficiency - % VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 20 50 0 20 40 60 80 0% 100 100 20% 40% 60% 80% 100% Output Load (%) Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 5.0V 2.5V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load) 80 Ripple - mV VOUT 60 5.0V 2.5V 1.5V 40 20 0 0 20 40 60 80 100 Iout (A) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 18 PT4829—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4829 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Min Max — — — — — — 5.0 1.8 1.5 ±0.5 ±0.5 ±0.1 ±0.1 — — 86.2 35 25 25 200 5 ±10 11 400 5.0 (2) 5.5 (2) 5.5 (2) 9 (2) 75 80 5.1 1.84 1.53 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 Units Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =5A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 4.9 1.76 1.47 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing — — 35.5 34 — — V Turn-On Time ton Vin =48V step — 140 (4) — ms 4 –0.2 — — 15 0.8 Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Io1 (5.0V) Io2 (1.8V) Io3 (1.5V) PT4829 Typ Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation A µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo2, and Vo3 cannot exceed 9ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 19 Typical Characteristics PT4829—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4829 Performance Characteristics (See Notes A, B) PT4829 Thermal Performance (See Note C) (Io1 + Io2 + Io3 =9A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Power 10 90 8 80 VIN Pd - Watts Efficiency - % VIN 36V 48V 75V 70 60 6 75V 48V 36V 4 2 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load) Safe Operating Area @Vin =48V 90 80 Ambient Temperature (°C) 90 Efficiency - % VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 50 20 0 20 40 60 80 100 0% Output Load (%) 100 20% 40% 60% 80% 100% Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 5.0V 1.5V 1.8V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load) 80 Ripple - mV VOUT 60 5.0V 1.5V 1.8V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 20 PT4831—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4831 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Min Max — — — — — — 5.0 3.3 1.5 ±0.5 ±0.5 ±0.1 ±0.1 — — 87 40 35 25 200 5 ±10 11 400 5.0 (2) 5.5 (2) 5.5 (2) 9 (2) 75 80 5.1 3.36 1.53 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 Units Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =5A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 4.9 3.24 1.47 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing — — 35.5 34 — — V Turn-On Time ton Vin =48V step — 140 (4) — ms 4 –0.2 — — 15 0.8 Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Io1 (5.0V) Io2 (3.3V) Io3 (1.5V) PT4831 Typ Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation A µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 9ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 21 Typical Characteristics PT4831—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4831 Performance Characteristics (See Notes A, B) PT4831 Thermal Performance (See Note C) (Io1 + Io2 + Io3 =9A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Power 10 8 VIN 80 VIN Pd - Watts Efficiency - % 90 36V 48V 75V 70 60 6 75V 48V 36V 4 2 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Power (%) Efficiency vs Output Power (Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load) Safe Operating Area @Vin =48V 90 Ambient Temperature (°C) 80 Efficiency - % 90 VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 20 50 0 20 40 60 80 0% 100 100 20% 40% 60% 80% 100% Output Load (%) Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 5.0V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 5.0V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 22 PT4832—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4832 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) PT4832 Typ Max — — — — — — 5.0 3.3 2.5 ±0.5 ±0.5 ±0.1 ±0.1 — — 86.7 30 25 25 200 5 ±10 11 400 5.0 (2) 5.5 (2) 5.5 (2) 9 (2) 75 80 5.1 3.36 2.55 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 — — 35.5 34 — — V — 140 (4) — ms 4 –0.2 — — 15 0.8 Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =5A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 0.1 0.1 — 36 — 4.9 3.24 2.45 — — — — — — — — — — — — — — 350 Under Voltage Lockout Von Voff Vin increasing Vin decreasing Turn-On Time ton Vin =48V step Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Min Io1 (5.0V) Io2 (3.3V) Io3 (2.5V) Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 (1) (1) (1) A A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation Units µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo2, and Vo3 cannot exceed 9ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 23 Typical Characteristics PT4832—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4832 Performance Characteristics PT4832 Thermal Performance (See Notes A, B) (See Note C) (Io1 + Io2 + Io3 =9A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Power 8 90 80 VIN Pd - Watts Efficiency - % 6 VIN 36V 48V 75V 70 36V 48V 75V 4 2 60 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load) Safe Operating Area @Vin =48V 90 80 Ambient Temperature (°C) Efficiency - % 90 VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 50 20 0 20 40 60 80 100 0% Output Load (%) 100 20% 40% 60% 80% 100% Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 5.0V 3.3V 2.5V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load) 80 Ripple - mV VOUT 60 5.0V 3.3V 2.5V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 24 PT4833—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4833 Electrical Specifications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax) Min PT4833 Typ Max 0.1A/µs load step, 50% to 75% Iomax Vo over/undershoot Vo1/Vo2/Vo3 Total, all outputs. Reset with auto-recovery Over Vin and Io ranges 0.25 (1) 0.1 (1) 0.1 (1) — 36 — 3.24 1.96 1.47 — — — — — — — — — — — — — — 350 — — — — — — 3.3 2.0 1.5 ±0.5 ±0.5 ±0.1 ±0.1 — — 86 40 25 25 200 3 ±10 14 400 8 (2) 6 (2) 6 (2) 12 (2) 75 80 3.36 2.04 1.53 — — ±0.5 ±0.5 ±3 (3) ±3 (3) — — — — — — — — 450 Von Voff Vin increasing Vin decreasing — — 35.5 34 — — V ton Vin =48V step — 140 (4) — ms 4 –0.2 — — 15 0.8 Characteristics Symbols Conditions Output Current Io Each output Input Voltage Range Vin Total (Io1 + Io2 + Io3) Continuous Surge (1 minute) Set-Point Voltage Vo Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Line Regulation Load Regulation Total Output Voltage Variation Regline Regload ∆Vo tol Efficiency Vo Ripple/Noise (0 to 20MHz bandwidth) η Vn All outputs, Over Vin range All outputs, 0≤Io≤Iomax Includes set-point, line, load, –40°C ≤Ta ≤+85°C Io1 =6A, Io2 =2A, Io3 =2A Transient Response ttr Vos Voadj ITRIP ƒs Under Voltage Lockout Turn-On Time Output Adjust Range Over-Current Threshold Switching Frequency Enable Control (pins 1 & 2) High-Level Input Voltage Low-Level Input Voltage Low-Level Input Current Standby Input Current Io1 (3.3V) Io2 (2.0V) Io3 (1.5V) Vo1 Vo2 Vo3 Vo1 Vo2/Vo3 Vo1 Vo2/Vo3 Vo1 Vo2 Vo3 A A V V %Vo %Vo %Vo %Vo % mVpp µSec %Vo %Vo A kHz Referenced to –Vin (pin 4) VIH VIL IIL Iin standby pins 1 & 2 open circuit (5) V — 1 2 mA — 1 5 mA Internal Input Capacitance Cint — 1.14 — External Output Capacitance Co1 Co2 Co3 V iso C iso R iso 0 0 0 1500 — 10 220 220 220 — 2,200 — 1,000 1,000 1,000 — — — Primary/Secondary Isolation Units µF (6) (6) µF (6) V pF MΩ Notes: (1) (2) (3) (4) (5) The converter will operate down to no load with reduced specifications. The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC. Limits are specified by design. Measured from the application of the input voltage to the instance that all outputs are in regulation. The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. For technical support and more information, see inside back cover or visit www.ti.com 25 Typical Characteristics PT4833—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4833 Performance Characteristics (See Note A, B) PT4833 Thermal Performance (See Note C) (Io1 + Io2 + Io3 =12A, represents 100% Load) 100 Efficiency vs Output Power (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) Power Dissipation vs Output Load 10 8 VIN 80 VIN Pd - Watts Efficiency - % 90 36V 48V 75V 70 60 6 75V 48V 36V 4 2 50 0 0 20 40 60 80 100 0 20 Output Load (%) 100 40 60 80 100 Output Load (%) Efficiency vs Output Power (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) Safe Operating Area @Vin =48V 90 Ambient Temperature (°C) 80 Efficiency - % 90 VIN 80 36V 48V 75V 70 60 Airflow 70 200LFM 120LFM 60LFM Nat Conv 60 50 40 30 20 50 0 20 40 60 80 0% 100 100 20% 40% 60% 80% 100% Output Power (%) Output Load (%) Output Ripple vs Output Power; Vin =48V (Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 2.0V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) 100 Output Ripple vs Output Power; Vin =48V (Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load) 80 Ripple - mV VOUT 60 3.3V 2.0V 1.5V 40 20 0 0 20 40 60 80 100 Output Load (%) Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition. Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com 26 Application Notes PT4820 Series Operating Features of the PT4820 Triple-Output DC/DC Converters Short-Circuit Protection Figure 1-1; Vo1, Vo2, Vo3 Power-Up Sequence To protect against load faults the PT4820 series of tripleoutput DC/DC converters incorporate output short-circuit protection. When the combined output current from all three outputs exceeds the over-current threshold (see data sheet specifications), the PT4820 shuts down after a short period of typically 15ms. This forces the output voltage at all three regulated outputs to simultaneously fall to zero. Following shutdown, the module automatically attempts to recover by executing a soft-start power-up. This occurs at intervals of approximately 65ms. If the load fault persists, the module will continually cycle through successive overcurrent trips and restarts. Vo1 (0.5V/Div) Vo2 (0.5V/Div) Vo3 (0.5V/Div) Over-Temperature Protection The PT4820 DC/DC converter series have an internal temperature sensor, which monitors the temperature of the module’s metal case. If the case temperature exceeds a nominal 110°C the converter will shut down. The converter will automatically restart when the sensed temperature returns to about 100°C. Under-Voltage Lock-Out The Under-Voltage Lock-Out (UVLO) circuit prevents operation of the converter whenever the input voltage to the module is insufficient to maintain output regulation. The UVLO has approximately 2V of hysterisis. This is to prevent oscillation with a slowly changing input voltage. Below the UVLO threshold the module is off and the enable control inputs, EN1 and EN2 are inoperative. On/Off Output Voltage Sequencing The power-up characteristic of the PT4820 series of DC/DC converters meets the requirements of microprocessor and DSP chipsets. All three outputs are internally sequenced to power-up in unison. Figure 1-1 shows the PT4820 output voltage rise times and characteristic shapes after either power is applied to the input of the converter, or the converter is enabled using one of the enable control inputs. All three output voltages rise simultaneously and monotonically until each reaches its respective output voltage. There is no turn-on overshoot and the output voltages are proportional to each other during power on. HORIZ. SCALE: 2ms/Div Primary-Secondary Isolation The PT4820 series of DC/DC converters incorporate electrical isolation between the input terminals (primary) and the output terminals (secondary). All converters are production tested to a withstand voltage of 1500VDC. The isolation complies with UL60950 and EN60950, and the requirements for operational isolation. This allows the converter to be configured for either a positive or negative input voltage source. The regulation control circuitry for these modules is located on the secondary (output) side of the isolation barrier. Control signals are passed between the primary and secondary sides of the converter. The data sheet ‘Pin Descriptions’ and ‘Pin-Out Information’ provides guidance as to which reference, primary or secondary, each pin is associated. Input Current Limiting The converter is not internally fused. For safety and overall system protection, the maximum input current to the converter must be limited. Active or passive current limiting can be used. Passive current limiting can be a fast acting fuse. A 125-V fuse, rated no more than 5A, is recommended. Active current limiting can be implemented with a current limited “Hot-Swap” controller. Turn-On Time The turn-on on time varies with the input voltage. The typical turn-on time (measured from the application of a valid input voltage to instance all outputs are in regulation) is typically 140 milliseconds at Vin =48V. The rise time of the output voltage is between 10 and 15 milliseconds. For technical support and more information, see inside back cover or visit www.ti.com 27 Application Notes PT4820 Series Using the On/Off Enable Controls on the PT4820 Series of Triple Output DC/DC Converters The PT4820 (48V input) series of triple-output DC/DC converters incorporate two output enable controls. EN1 (pin 1) is the Positive Enable input, and EN2 (pin 2) is the Negative Enable input. Both inputs are electrically referenced to -Vin (pin 4) on the primary or input side of the converter. The Enable pins are ideally controlled with an open-collector (or open-drain) discrete transistor. A pullup resistor is not required. If a pull-up resistor is added, the pull-up voltage must be limited to 15V. Negative Output Enable (Positive Inhibit) Automatic (UVLO) Power-Up Figure 2-2; Negative Enable Configuration Connecting EN2 (pin 2) to -Vin (pin 4) and leaving EN1 (pin 1) open-circuit configures the converter for automatic power up. (See data sheet “Typical Application”). The converter control circuitry incorporates an “Under Voltage Lockout” (UVLO) function, which disables the converter until the minimum specified input voltage is present at ±Vin. (See data sheet Specifications). The UVLO circuitry ensures a clean transition during power-up and power-down, allowing the converter to tolerate a slowrising input voltage. For most applications EN1 and EN2, can be configured for automatic power-up. To configure the converter for a negative enable function, EN1 (pin 1) is left open circuit, and the system On/Off control signal is applied to EN2 (pin 2). Applying less than 0.8V (with respect to -Vin potential) to pin 2, enables the converter outputs. An example using a buffer transistor is again detailed in Figure 2-2. Note: The converter will only produce and output voltage if a valid input voltage is applied to ±Vin. DC/DC Module 1 2 EN 1 EN 2 BSS138 1 =Outputs On –VIN 4 –Vin Positive Output Enable (Negative Inhibit) To configure the converter for a positive enable function, connect EN2 (pin 2) to -Vin (pin 4), and apply the system On/Off control signal to EN1 (pin 1). In this configuration, applying less than 0.8V (with respect to -Vin potential) to pin 1 disables the converter outputs. Figure 2-1 is an example of this implemention using a buffer transistor. Figure 2-1; Positive Enable Configuration On/Off Enable Turn-On Time When the On/Off enable inputs, EN1 or EN2 are used to enable the PT4820's output voltages, the turn-on delay time (measured from the transition of the enable signal to the instance the outputs begin to rise) will vary with the input voltage and the module’s internal timing. At an input voltage of 48V, the total turn-on time is between 20 and 60 milliseconds. This turn-on time reduces as the input voltage is increased. The rise time of the output voltages is between 10 and 15 milliseconds. DC/DC Module 1 2 BSS138 EN 1 EN 2 1 =Outputs Off –VIN 4 –Vin For technical support and more information, see inside back cover or visit www.ti.com 28 Application Notes PT4820 Series Adjusting the Output Voltages of the PT4820 Triple-Output DC/DC Converters The output voltages of the PT4820 series of triple-output DC/DC converters, Vo1, Vo2 and Vo3 are independently adjustable. The adjustment method uses a single external resistor, 1 which may be used to adjust a selected output by up to a nominal ±10% from the factory preset value. The value of the resistor determines the magnitude of adjustment, and the placement of the resistor determines the direction of adjustment (up or down). Resistor values can be calculated using the appropriate formula (see below) and the constants provided in Table 3-2. Alternatively the value may be selected directly from Table 3-3. The placement of each resistor is detailed as follows. Table 3-1; Adjust Resistor Pin Connections To Adjust Up Connect R1 from to Vox Adj To Adjust Down Connect (R2) from to Vox Adj Vox Vo1 11 COM 10 11 12 Vo2 15 14 15 16 Vo3 19 18 19 20 Calculation of Adjust Values Adjust Up: To increase a specific output, add a resistor R1 between the appropriate Vox Adj (Vo1 Adj, Vo2 Adj, or Vo3 Adj) and the output common (COM). See Figure 3-1(a) and Table 3-1 for the resistor placement and pin connections. The adjust resistor values may be calculated. Use the applicable formula and select the appropriate constants from Table 2 for the output and model being adjusted. R1 [Adjust Up] 3 = Ro · Vr Va – Vo – Rs kΩ (R2) [Adjust Down] 3 = Ro (Va – Vr ) Vo – Va – Rs kΩ Figure 3-1a PT4820 +Vo x # +Vox (Adjusted Up) +Vx Adj Where: Vo Va Vr Ro Rs # R1 COM 9,10,14,18 Output Common = = = = = Original output voltage Adjusted output voltage The reference voltage from Table 3-2 The resistance value in Table 3-2 The series resistance from Table 3-2 # - See Table 3-1 for pin connections, where Vo x equals Vo 1, Vo 2, or Vo 3 Adjust Down: Add a resistor (R2), between the appropriate Vox Adj (Vo1, Vo2, or Vo3) and the output being adjusted. See Figure 3-1(b) and Table 1 for the resistor placement and pin connections. Figure 3-1b Notes: 1. Use only a single 1% (or better) tolerance resistor in either the R1 or (R2) location to adjust a specific output. Place the resistor as close to the ISR as possible. 2. Never connect capacitors to any of the ‘Vox Adj’ pins. Any capacitance added to these control pins will affect the stability of the respective regulated output. 3. Adjustments made to any output must also comply with the following limitations. PT4820 +Vo x # Vo1 Vo1 +Vox ≥ (Vo2 + 0.5V), and ≥ (Vo3 + 0.5V) (Adjusted Down) (R 2) +Vx Adj COM # 9,10,14,18 Output Common # - See Table 3-1 for pin connections, where Vo x equals Vo 1, Vo 2, or Vo 3 For technical support and more information, see inside back cover or visit www.ti.com 29 Application Notes continued PT4820 Series Table 3-2 Vo1, Vo2, & Vo3 OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS Vo (nom) Va (min) Va (max) Vr Ω) Ro (kΩ Ω) Rs (kΩ 5.0V 4.5V 5.5V 1.225V 15.4 33.2 3.3V 2.97V 3.63V 1.225V 11.0 40.2 2.5V 2.25V 2.75V 1.225V 10.2 40.2 2.0V 1.8V 2.2V 1.225 10.2 24.9 1.8V 1.62V 1.98V 1.225V 12.1 22.1 1.5V 1.35V 1.65V 1.225V 7.5 5.36 1.2V 1.08V 1.32V 1.003V 9.76 3.65 Table 3-3 Vo1, Vo2, & Vo3 OUTPUT VOLTAGE ADJUST RESISTOR VALUES (See Note 3 for adjustment limitations) Vo (nom) Va (req’d) 5.0V 3.3V 2.5 Vo (nom) Va (req’d) 2.0V 1.8V 1.5V 1.2V 2.25 (1.6)kΩ 1.080 2.3 (14.6)kΩ 1.100 (5.8)kΩ 2.35 (36.3)kΩ 1.120 (10.6)kΩ 2.4 (79.6)kΩ 1.140 (18.6)kΩ 2.45 (210.0)kΩ 1.160 (34.7)kΩ 1.180 (82.7)kΩ 2.5 2.55 (2.6)kΩ 210.0kΩ 1.200 2.6 84.7kΩ 1.220 486.0kΩ 2.65 43.1kΩ 1.240 241.0kΩ 2.7 22.3kΩ 1.260 160.0kΩ 2.75 9.8kΩ 1.280 119.0kΩ 94.2kΩ 2.97 (18.0)kΩ 1.300 3.0 (24.9)kΩ 1.320 3.05 (40.1)kΩ 1.350 (0.9)kΩ 3.1 (62.9)kΩ 1.375 (3.6)kΩ 3.15 (101.0)kΩ 1.400 (7.8)kΩ 3.2 (177.0)kΩ 1.425 (14.6)kΩ 3.25 (405.0)kΩ 1.450 (28.4)kΩ 1.475 (69.6)kΩ 3.3 3.35 77.9kΩ 229.0kΩ 1.500 3.4 94.5kΩ 1.525 362.0kΩ 3.45 49.6kΩ 1.550 178.0kΩ 3.5 27.2kΩ 1.575 117.0kΩ 3.55 13.7kΩ 1.600 3.6 4.7kΩ 1.620 (4.5)kΩ 71.2kΩ 3.63 0.6kΩ 1.650 (12.2)kΩ 55.9kΩ 1.700 (35.4)kΩ • 86.5kΩ 4.5 (67.7)kΩ 1.750 4.6 (96.7)kΩ 1.800 (4.4)kΩ 4.7 (145.0)kΩ 1.850 (17.6)kΩ 274.0kΩ 4.8 (242.0)kΩ 1.900 (43.9)kΩ 126.0kΩ 4.9 (533.0)kΩ 1.950 (123.0)kΩ 76.7kΩ 5.0 (105.0)kΩ 2.000 5.1 155.0kΩ 2.050 225.0kΩ 5.2 61.1kΩ 2.100 100.0kΩ 5.3 29.7kΩ 2.150 58.4kΩ 5.4 14.0kΩ 2.200 37.6kΩ 5.5 4.5kΩ R1 = (Blue) R2 = Black For technical support and more information, see inside back cover or visit www.ti.com 30 Application Notes PT4820 Series VDE Approved Installation Instructions (Installationsanleitung) Nennspannnug (Rated Voltage): PT4820 36 to 72 Vdc, Transient to 80Vdc Nennaufnahme (Rated Input): PT4820 Nennleistung (Rated Power): 40 Watts Maximum Ausgangsspannung (Sec. Voltage): PT4820 Series PT4821, +3.3/ +2.5/ +1.5 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc PT4822, +3.3/ +1.8/ +1.5 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc PT4823, +3.3/ +2.5/ +1.2 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc PT4824, +3.3/ +1.8/ +1.2 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc PT4825, +3.3/ +1.5/ +1.2 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc PT4826, +5.0/ +3.3/ +1.8 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc PT4827, +3.3/ +2.5/ +1.8 Vdc; 8.0/ 6.0 /6.0 Adc; Max total is 12Adc PT4828, +5.0/ +2.5/ +1.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc PT4829, +5.0/ +1.8/ +1.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc PT4831, +5.0/ +3.3/ +1.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc PT4832, +5.0/ +3.3/ +2.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc Ausgangsstrom (Sec. Current): oder (or) Ausgangsleistung (Sec. Power): 1.5 Adc Angabe der Umgebungstemperatur (Information on ambient temperature): +85 °C maximum as tested Besondere Hinweise (Special Instructions): Es ist vorzusehen, daß die Spannungsversorgung in einer Endanwendung über eine isolierte Sekundaerschaltung bereit gestellt wird. Die Eingangspannung der Spannungsversorgungsmodule muss eine verstaerkte Isolierung von der Wechselstromquelle aufweisen. Die Spannungsversorgung muss gemaess den Gehaeuse-, Montage-, Kriech- und Luftstrecken-, Markierungs- und Trennanforderungen der Endanwendung installiert werden. (The power supply is intended to be supplied by isolated secondary circuitry in an end use application. The input power to these power supplies shall have reinforced insulation from the AC mains. The power supply shall be installed in compliance with the enclosure, mounting, creepage, clearance, casualty, markings, and segregation requirements of the end-use application. Offenbach, VDE Prüf- und Zertifizierungsinstitut Abteilung / Department TD Ort / Place: Datum / Date: Nov 6, 2002 (Stempel und Unterschrift des Herstellers / Stamp and signature of the manufacturer) (Jürgen Bärwinkel) For technical support and more information, see inside back cover or visit www.ti.com 31 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. 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