PT4486—48V 100-W 8.5-A Programmable Isolated DC/DC Converter SLTS121C – SEPTEMBER 2000 – REVISED OCTOBER 2004 Features • 36 V to 75 V Input Voltage Range • Programmable Output Voltage Range: 6.5 V to 17.5 V • -40° to +85°C Operating Temp • 1500 VDC Isolation • 89% Efficiency • On/Off Inhibit • Differential Remote Sense • 17 A Output with PT4497 • • • • • • Over-Current Protection Over-Temperature Protection Over-Voltage Protection Space-Saving Package Solderable Copper Case Safety Approvals: UL 60950 CSA 22.2 950 VDE EN60950 Description Ordering Information Pin-Out Information The PT4486 Excalibur™ DC/DC converter module combines state-of-theart power conversion technology with un-paralleled flexibility. Incorporating high efficiency and ultra-fast transient response, these modules provide up to 8.5 A of output current over the programmable voltage range of 6.5 V to 17.5 V. The modules include a number of inbuilt features to facilitate system integration. These include a foldback output current limit, over-temperature protection, and an inhibit on/off control. A differential remote sense is also provided to compensate for voltage drop between the converter and load. For additional output current, one PT4486 may be operated with up to two PT4497 compatible booster modules. Each PT4497 adds an additional 8.5A of output current capability. PT4486❏ ❏ = 6.5 to 17.5 Volts ❏ = 8.5-A Booster PT4497❏ Pin PT Series Suffix (PT1234 x ) Case/Pin Configuration Order Suffix Package Code * N A C Vertical Horizontal SMD (EKD) (EKA) (EKC) * Previously known as package styles 1200, 1210, and 1215. (Reference the applicable package code drawing for the dimensions and PC board layout) Function Pin Function 1 +Vin 14 –Vout 2 –Vin 15 –Vout 3 Inhibit 16 –Vout 4 Vr † 17 –Vout 5 Va † 18 –Vout 6 Do not connect 19 –Vout 7 (+)Remote Sense 20 (–)Remote Sense 8 +Vout 21 VID0 9 +Vout 22 VID1 10 +Vout 23 VID2 11 +Vout 24 VID3 12 +Vout 25 VID4 13 +Vout 26 DRV † † Pins 4, 5, & 26 are used for booster applications. For stand-alone operation, leave open circuit. • Shaded functions indicate those pins that are referenced to primary-side potential. Standard Application +VIN 1 + C1 +Vin 2 –Vin C2 Inhibit 3 +VOUT 7 +Vsns +Vout 8-13 PT4486 -Vout VID0 - VID4 -Vsns 21 22 23 24 25 • Co = Optional 33-µF electrolytic capacitor 14-19 L O A D + Co 20 –VIN –VOUT PROGRAMMING PINS For technical support and further information, visit http://power.ti.com • C1 = Optional 33-µF, 100-V electrolytic capacitor • C2 = Optional 1-µF, 100-V ceramic capacitor • Programming pins, VID0–VID4, are shown configured for Vo =12 V • For normal operation, pin 3 (Inhibit) must be connected to –Vin. PT4486—48V 100-W 8.5-A Programmable Isolated DC/DC Converter SLTS121C – SEPTEMBER 2000 – REVISED OCTOBER 2004 Programming Information VID3 VID2 VID1 VID0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 PT4480 Series Comparison VID4=1 Vout VID4=0 Vout 10.0 V 10.5 V 11.0 V 11.5 V 12.0 V 12.5 V 13.0 V 13.5 V 14.0 V 14.5 V 15.0 V 15.5 V 16.0 V 16.5 V 17.0 V 17.5 V 6.50 V 6.75 V 7.00 V 7.25 V 7.50 V 7.75 V 8.00 V 8.25 V 8.50 V 8.75 V 9.00 V 9.25 V 9.50 V 9.75 V 10.00 V 10.25 V Logic 0 = Connect to (–)Remote Sense, pin 20 Logic 1 = Open circuit (no pull-up resistors) VID3 & VID4 must not be changed while the unit is operating. Specifications Functionality Output Voltage Program Range Configuration for Current Sharing PT4481 Regulator 1.3 V– 3.5 V N+1 with other PT4481s PT4482 Regulator 1.3 V– 3.5 V With PT4499 boosters PT4499 PT4482 Booster N/A Used only with PT4482 PT4483 Regulator 4.6 V–5.7 V N+1 with other PT4483s PT4484 Regulator 4.6 V–5.7 V With PT4498 boosters PT4498 PT4484 Booster N/A Used only with PT4484 N+1 with other PT4485s PT4485 Regulator 6.5 V– 17.5 V # PT4486 Regulator 6.5 V–17.5 V With PT4497 boosters # PT4497 PT4486 Booster N/A Used only with PT4486 # This specification covers only the PT4486 regulator and PT4497 current booster. (Unless otherwise stated, T a =25°C, Vin =48 V, V o =12 V, C o =0 µF, and I o =Iomax) Characteristic Symbol Conditions Min PT4486 Typ Max Units Output Current Input Voltage Range Set Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Voltage Variation Io Vin Vo tol Regtemp Regline Regload ∆Votot Over Vin range Over Io Range 0.1 (1) 36 — — — — — 48 ±1 ±0.5 ±0.1 ±0.5 8.5 (2) 75 ±1.5 — ±1 ±1 A VDC %Vo %Vo %Vo %Vo — ±2 ±3 %Vo Efficiency Vo Ripple (pk-pk) Transient Response η Vr ttr ∆Vtr — — — — — 89 120 N/A 1 200 ±5 — 150 — — — — % mVpp µs %Vo µs %Vo Current Limit Ilim — 10 — A Current Share Tolerance Over-Voltage Protection Switching Frequency Under-Voltage Lockout Inhibit (Pin 3) Input High Voltage Input Low Voltage Input Low Current Ishr tol OVP ƒs UVLO — — 270 — ±10 125 300 34.5 — — 350 — % %Vo kHz V 2.5 –0.5 — — — 0 1500 — 10 -40 — -40 — — –0.2 4 3 — — 1100 — — 110 — Open (3) +0.8 — 10 — 10,000 — — — +100 (4) — +125 V mA mA µF µF V pF MΩ °C °C °C 1.7 — — 106 Hrs — 500 — G’s — 20 (5) — G’s — 90 — grams Standby Input Current Internal Input Capacitance External Output Capacitance Isolation Voltage Capacitance Resistance Operating Temperature Range Over-Temperature Shutdown Storage Temperature Reliability VIH VIL IIL Iin standby Cin Cout Tc OTP Ts MTBF Mechanical Shock — Mechanical Vibration — Weight Flammability — — –40° ≤Tcase ≤ +100°C, Io =0 Over Vin range Over Io range Includes set-point, line, load, –40° ≤Tcase ≤ +100°C Io =5 A 20 MHz bandwidth 0.1 A/µs load step, 50% to 75% Iomax Vo over/undershoot 1 A/µs load step, 50% to 100% Iomax Vo over/undershoot Vin =36 V, ∆Vo = –1% foldback continuous limit with PT4497 booster Shutdown and latch off Over Vin range Referenced to –Vin (pin 2) pins 3 & 2 connected Between +Vo and –Vo Input–output/input–case Input to output Input to output Case temperature, over Vin range Case temperature, auto reset — Per Bellcore TR-332 50% stress, Ta =40°C, ground benign Per Mil-Std-883D, method 2002.3, 1mS, half-sine, mounted to a fixture Mil-Std-883D, Method 2007.2 Horizontal 20-2000 Hz, pcb mounted — Materials meet UL 94V-0 Notes: (1) The converter requires a 100 mA load to ensure proper operation. (2) The maximum output current is limited to 8.5 A or 100/VOUT, whichever is less. (3) The Inhibit (pin 3) has an internal pull-up, and must be pulled to –Vin potential to enable the output. If it is left open circuit the converter output will be disabled. The open-circuit voltage is limited to 6.5 V. Refer to the application notes for other interface considerations. (4) See Safe Operating Area curves or contact the factory for the appropriate derating. (5) The case pins on through-hole pin configuration (suffix A) must be soldered. For more information see the applicable package outline drawing. For technical support and further information, visit http://power.ti.com Typical Characteristics PT4486—48V 100-W 8.5-A Programmable Isolated DC/DC Converter SLTS121C – SEPTEMBER 2000 – REVISED OCTOBER 2004 Performance Characteristics, Vo =12 V (See Note A) Performance Characteristics, Vo =15 V Efficiency vs Output Current Efficiency vs Output Current 95 95 90 90 85 85 VIN 36 V 48 V 60 V 75 V 80 75 Efficiency - % Efficiency - % (See Note A) 36 V 48 V 60 V 75 V 80 75 70 70 65 65 60 VIN 60 0 1 2 3 4 5 6 7 8 0 1 2 Iout (A) 3 4 5 6 Iout (A) Power Dissipation vs Output Current Power Dissipation vs Output Current 14 18 16 12 14 75 V 60 V 48 V 36 V 10 8 Pd - Watts Pd - Watts 10 VIN 12 6 VIN 75 V 60 V 48 V 36 V 8 6 4 4 2 2 0 0 0 1 2 3 4 5 6 7 0 8 1 2 Safe Operating Area, VO =12 V ( See Note B) 4 5 6 Safe Operating Area, VO =15 V ( See Note B) 90 90 80 Airflow 70 Nat conv 100LFM 200LFM 300LFM 400LFM 500LFM 60 50 40 Ambient Temperature (°C) 80 Ambient Temperature (°C) 3 Iout (A) Iout (A) Airflow 70 500LFM 400LFM 300LFM 200LFM 100LFM Nat conv 60 50 40 30 30 20 20 0 1 2 3 4 5 6 7 8 Iout (A) 0 1 2 3 4 5 6 Iout (A) Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter. Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures For technical support and further information, visit http://power.ti.com Application Notes PT4486, PT4497 Increasing the Output Current of the PT4486 with the PT4497 Compatible Current Booster Notes: 1. Refer to the PT4486 specification table for the performance of the regulator/booster combination. The PT4497 is a 8.5-A “Current Booster” module designed specifically for the PT4486 programmable DC/DC converter. The booster is controlled directly by the regulator, and effectively adds an additional output stage that operates in parallel. This allows the system to run sychronously, providing a low noise solution. Up to two booster modules can be connected to a PT4486 converter. Each booster module increases the available output current by 8.5 A. A combination of one PT4486 converter and two PT4497 booster modules can supply up to 25.5 A of output current; enough power to supply a moderately sized rack-mounted system. Figure 1-1 shows the connection schematic for the regulator and current booster combination. 2. The pin-out of the current booster modules include a number pins identified, “Do not connect” (see Table 1-1). These pins are not connected internally to the module but must be soldered to a pad to preserve the unit’s mechanical integrity. 3. A minimum of 33 µF of output capacitance is required across the output of each PT4497 booster for proper operation. A value greater than 33 µF will further reduce transients due to large and/or fast load steps. 4. The converter and all boosters must be located on the same printed circuit board. A similar footprint and trace layout for each module will also facilitate current sharing. Table 1-1; Booster Pin-Out Information A current booster is not a stand-alone product, and can only operate with a regulator. It is housed in the same package as its compatible regulator, and shares the same mechanical outline. Except for an increase in output current, the overall performance of a converter/booster combination is identical to that of a stand-alone converter. Pin Function Pin Function Pin Function 10 +Vout 11 +Vout 19 –Vout 20 (–)Vsense Do not connect 12 +Vout 21 Do not connect Vr 13 +Vout 22 Do not connect 5 6 Va Do not connect 14 –Vout 15 –Vout 23 Do not connect 24 Do not connect 7 Do not connect 16 –Vout 25 Do not connect 8 +V out 17 –Vout 26 DRV 9 +V out 18 –Vout 1 2 +Vin –V in 3 4 Figure 1-1; Current Booster Application Schematic PROGRAMMING PINS VID0 VID1 VID2 VID3 VID4 REMOTE SENSE (+) 25 +VIN Inhibit 1 CIN 33µF Optional + 24 23 22 7 21 PT4486 2 3 4 5 26 20 +VOUT 8 - 13 14-19 COUT 33µF Optional + LOAD -VOUT –VIN REMOTE SENSE (-) 4 5 26 1 CIN 33µF Optional + 20 PT4497 2 8 - 13 COUT 33µF Required 3 14 - 19 + For technical support and further information, visit http://power.ti.com Application Notes PT4470, PT4480 Series Operating Features of the PT4470 and PT4480 Series of Isolated DC/DC Converters Under-Voltage Lockout An Under-Voltage Lock-Out (UVLO) inhibits the operation of the converter until the input voltage is above the UVLO threshold (see the applicable data sheet specification). Below this voltage, the module’s output is held off, irrespective of the state of the Inhibit control (pin 3). If the Inhibit control is connected to –Vin (pin 2), the module will automatically power up when the input voltage rises above the UVLO threshold. The UVLO allows the module to produce a clean transition during both power-up and power-down, even when the input voltage is rising or falling slowly. It also reduces the high start-up current during normal power-up of the converter, and minimizes the current drain from the input source during low-input voltage conditions. The UVLO threshold includes about 2 V of hysteresis. Once operational, the converter will conform to its operating specifications when the minimum specified input voltage is reached. Over-Current Protection To protect against load faults, the PT4470/80 series of DC/DC converters incorporate an output current limit. Once the load current drawn from the module reaches the current limit threshold, any attempt by the load to draw additional current will result in a significant drop in the module’s regulated output voltage. The current limit circuitry incorporates a limited amount of foldback. This has the effect of slightly reducing the output current from the module when supplying an absolute short circuit. Upon removal of the load fault, the output voltage from the converter will automatically recover to its programmed regulation voltage. Output Over-Voltage Protection The PT4470/80 series of DC/DC converters incorporate circuitry that continually senses the output for an overvoltage (OV) condition. The OV threshold automatically tracks the VID output voltage program setting to a level 25% higher than that programmed at the control pins, VID0 through VID4. If the converter output voltage exceeds the OV threshold, the converter is immediately shut down and remains in a latched-off state. To resume normal operation the converter must be actively reset. This is accomplished by either cycling the status of the Inhibit control (pin 3) from “On” to “Off” and then back “On” again, or by momentarily removing the input power to the converter. For failsafe operation and redundancy, the OV protection uses circuitry that is independent of the converter’s internal feedback loop. For technical support and further information, visit http://power.ti.com Over-Temperature Protection Over-temperature protection is provided by an internal temperature sensor, which closely monitors the temperature of the converter’s metal case. If the case temperature exceeds the specified limit (see applicable data sheet), the converter will shut down. The converter will then automatically restart when the sensed temperature drops by about 10°C. When operated outside its recommended thermal derating envelope (see data sheet SOA curves), the converter will typcially cycle on and off at intervals from a few seconds to one or two minutes. This is to ensure that the internal components are not permanently damaged from excessive thermal stress. Primary-Secondary Isolation Electrical isolation is provided between the input terminals (primary) and the output terminals (secondary). All converters are production tested to a primary-secondary withstand voltage of 1500VDC. This specification complies with UL60950 and EN60950 and the requirements for operational isolation. Operational isolation allows these converters to be configured for either a positive or negative input voltage source. The data sheet ‘Pin-Out Information’ uses shading to indicate which pins are associated with the primary. They include pins 1 through 5, inclusive. Fuse Recommendations If desired, an input fuse may be added to protect against the application of a reverse input voltage. Thermal Considerations Airflow may be necessary to ensure that the module can supply the desired load current in environments with elevated ambient temperatures. The required airflow rate may be determined from the Safe Operating Area (SOA) thermal derating chart (see converter specifications). The recommended direction for airflow is into the longest side of the module’s metal case. See Figure 1. Figure 1 Recommended direction for airflow is into (perpendicular to) the longest side. Application Notes PT4470, PT4480 Series Using the Inhibit Function on the PT4470 & PT4480 Series of Isolated DC/DC Converters The PT4470/44480 series of DC/DC converters incorporate an On/Off Inhibit function. This function may be used in applications that demand battery conservation, power-up/shutdown sequencing, and/or to coordinate power-up for active in-rush current control. The On/Off feature is provided by the Inhibit control, pin 3. The Inhibit pin of the PT4470/4480 series of converters is an active low enable. The pin must be either connected, or actively pulled low, to –Vin (pin 2) to enable the converter output (see standard application schematic). When pins 2 & 3 are connected, the converter provides a regulated output whenever a valid source voltage3 is applied between +Vin (pin 1), and –Vin (pin 2). If pin 3 is disconnected, or allowed to become high impedance, the regulator output will be disabled. 5 Table 2-1 provides details of the interface requirements for the Inhibit pin. Figure 2-1 shows how a discrete MOSFET (Q1) 4, may be referenced to –Vin and used to control the input. Table 2-1 Inhibit Control Requirements Parameter Min Max Enable (VIH) Disable (VIL) –0.5 V 2.5 V 0.8 V (Open Circuit) Notes: 1. The Inhibit control uses –Vin (pin 2), on the primary side of the converter, as its ground reference. All voltages specified are with respect to –Vin. 6. Keep the on/off transition to less than 1ms. This prevents erratic operation of the ISR, whereby the output voltage may drift un-regulated between 0 V and the rated output during power-up. Figure 2-1 +VIN 1 + +V in 2 –V in C1 1 =Enable 7 +V sns +V out 8-13 Inhibit 3 PT4472 VID0 - VID4 21 22 23 24 25 +2.5V -Vout 14-19 -Vsns 20 0V Q1 BSS138 PROGRAMMING PINS –VIN Turn-On Time: With input power applied, the converter typically produces a fully regulated output voltage within 25 ms after applying a low-voltage signal to the Inhibit control pin. The actual turn-on time will vary with the input voltage, output load, and the total amount of capacitance connected to the output. Using the circuit of Figure 2-1, Figure 2-2 shows the typical output voltage and input current waveforms of a PT4472 after Q 1 is turned on. The turn on of Q1 correlates to the fall in Vinh. The output voltage was set to 2.5 V. The waveform was measured with a 48-Vdc input voltage, and 15-A load current. Figure 2-2 2. The internal circuitry is simple pull-up resistor. The open-circuit voltage may be as high as 6.5 Vdc. 3. These converters incorporate an “Under-Voltage Lockout” (UVLO) function. This function automatically disables the converter output until there is sufficient input voltage to produce a regulated output. Table 2 gives the applicable UVLO thresholds. Table 2-2 UVLO Thresholds 1 Series UVLO Threshold PT4470 PT4480 17 V Typical 34.5 V Typical Vout (1V/Div) Iin (2A/Div) Vin Range 18 – 36 V 36 – 75 V 4. The Inhibit input must be controlled with an opencollector (or open-drain) discrete transistor or MOSFET. Do not use a pull-up resistor. Vinh (5V/Div) HORIZ SCALE: 5ms/Div 5. When the converter output is disabled, the current drawn from the input supply is typically reduced to 4 mA (10 mA maximum). For technical support and further information, visit http://power.ti.com Application Notes PT4470 & PT4480 Series VDE Approved Installation Instructions (Installationsanleitung) Nennspannnug (Rated Voltage): PT4450, 70, and 93-95 series PT4460, 80, and 97-99 series 18-36Vdc 36-75Vdc Nennaufnahme (Rated Input): PT4450, 70, and 93-95 series PT4460, 80, and 97-99 series 6.8Adc 3.4Adc Nennleistung (Rated Power): PT4450, 60, 80, and 90 series 100W max Ausgangsspannung (Sec. Voltage): PT4451, 52, 61, 62, 71, 72, 81, 82, 99 3.3V/30A/100W PT4453, 54, 63, 64, 73,74, 83, 84, 94, 98 5.7V/20A/100W PT4455, 56, 65, 66, 75, 76, 85, 86, 93, 97 17.5V/8.3A/100W Ausgangsstrom (Sec. Current): oder (or) Ausgangsleistung (Sec. Power): Angabe der Umgebungstemperatur (Information on ambient temperature): +85 °C maximum 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. Bei Einsatz eines TNV-3Einganges muss die SELV-Schaltung ordnungsgemaess geerdet 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. When the input is TNV-3, the SELV circuitry must be reliably grounded.) Offenbach, 8.8.02 VDE Prüf- und Zertifizierungsinstitut Abteilung / Department TD (Jürgen Bärwinkel) For technical support and further information, visit http://power.ti.com Ort / Place: Datum / Date: 5/29/02 (Stempel und Unterschrift des Herstellers / Stamp and signature of the manufacturer) PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2005 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing PT4486C NRND SIP MOD ULE EKC Pins Package Eco Plan (2) Qty 26 6 TBD Lead/Ball Finish MSL Peak Temp (3) Call TI Level-3-215C-168HRS (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. 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