PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 50-W, 48-V INPUT, 12-V OUTPUT, ISOLATED DC/DC CONVERTER FEATURES • • • • • • • • • • • • • DESCRIPTION 50-W Output Input Voltage Range: 36 V to 75 V 91% Efficiency 2000 VDC Isolation On/Off Control Overcurrent Protection Differential Remote Sense Adjustable Output Voltage Output Overvoltage Protection Over-Temperature Shutdown Undervoltage Lockout Standard 1/8-Brick Footprint UL Safety Agency Approval The PTEA404120 power module is isolated DC/DC converter, housed standard one-eighth brick package. rated up to 50 W with a maximum 4.2 A. a single-output in an industry This module is load current of The PTEA404120 operates from a standard 48-V telecom central office (CO) supply and occupies less than 2.0 in2 of PCB area. The modules offer OEMs a compact and flexible high-output power source in an industry standard footprint. They are suitable for distributed power applications in both telecom and computing environments, and may be used for intermediate bus converter architectures. Features include a remote On/Off control with optional logic polarity, an undervoltage lockout (UVLO), a differential remote sense, and an industry standard output voltage adjustment using an external resistor. Protection features include output overcurrent protection (OCP), overvoltage protection (OVP), and thermal shutdown (OTP). The modules are fully integrated for stand-alone operation, and require no additional components. STANDARD APPLICATION SENSE (+) +VO 7 +VI Sense(+) 1 +V I CI (Optional) 3 −VI +VO PTEA404120N −VI Remote On/Off 2 Adjust −VO Sense(−) 8 6 CO (Optional) 4 L O A D −VO 5 SENSE (–) Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2006–2007, Texas Instruments Incorporated PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TI website at www.ti.com. PART NUMBERING SCHEME PTEA Input Voltage Output Current Output Voltage Enable Electrical Options 4 04 120 N 2 4 = 48 V 04 = 4A 120 = 12 V N = Negative 2 = VO Adjust P = Positive Pin Style A D D = Through-hole, Pb-free S = SMD, SnPb solder ball Z = SMD, SnAgCu solder ball ABSOLUTE MAXIMUM RATING UNIT TA Operating Temperature Range VI, MAX Maximum Input Voltage PO, MAX Maximum Output Power TS Storage Temperature Continuous voltage 75 V Peak voltage for 100 ms duration 100 V 50 W –40°C to 125°C 250 G Per Mil-STD-883, Method 2002.3 1 ms, 1/2 Sine, mounted AS or AZ Suffix 500 G Mechanical Vibrarion Per Mil-STD-883, Method 2007.2 20-2000 Hz, PCB mounted AD Suffix 15 G AS or AZ Suffix Flammability 2 AD Suffix Mechanical Shock Weight (1) –40°C to 85°C (1) Over VI Range 10 G 18 grams Meets UL 94V-O See SOA curves or consult factory for appropriate derating. Submit Documentation Feedback PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 ELECTRICAL CHARACTERISTICS PTEA404120 (Unless otherwise stated, TA =25°C, VI = 48 V, VO = 12 V, CO = 0 µF, and IO = IOmax) PARAMETER TEST CONDITIONS MIN IO Output Current Over VI range 0 VI Input Voltage Range Over IO Range 35 VO tol TYP 48 Set Point Voltage Tolerance 11.88 12 –40°C >TA > 85°C Regline Line Regulation Over VI range ±5 Regload Load Regulation Over IO range ±5 ∆Votot Total Output Voltage Variation Includes set-point, line, load, –40°C >TA > 85°C ∆VADJ Output Adjust Range PO≤ 50 W and IO≤ 4.2 A η Efficiency IO = IOmax VR VO Ripple (pk-pk) 20 MHz bandwidth Transient Response ∆Vtr A 75 V %VO 12.12 ±1.15 Temperature Variation ±1.5 –40 UNIT 4.2 ±1 (1) Regtemp ttr MAX V %VO mV mV ±3 %VO 10 %VO 91% 50 mVpp 0.1 A/µs slew rate, 50% to 75% IOmax 500 µs VO over/undershoot 200 mV ITRIP Overcurrent Threshold Shutdown, followed by auto-recovery OVP Output Overvoltage Protection Output shutdown and latch off 120 %VO OTP Over Temperature Protection Temperature Measurement at thermal sensor. Hysteresis = 10°C nominal. 115 °C fs Switching Frequency Over VI range 250 kHz UVLO Undervoltage Lockout 7 VOFF VI decreasing, IO = 1 A 32.5 VHYS Hysteresis 1.5 A V On/Off Input: Negative Enable VIH Input High Voltage VIL Input Low Voltage IIL Input Low Current Referenced to –VI 2.4 Open (2) –0.2 0.8 –0.3 V mA On/Off Input: Positive Enable 4.5 Open (2) –0.2 0.8 VIH Input High Voltage VIL Input Low Voltage IIL Input Low Current IISB Standby Input Current Output disabled (pin 2 status set to Off) CI External Input Capacitance Between +VI and –VI 0 Between +VO and –VO 0 CO (1) (2) External Output Capacitance Referenced to –VI –0.3 Equivalent Series Resistance mA 10 1000 µF mΩ Isolation Voltage Input-to-output and input-to-case 2000 Isolation Capacitance Input-to-output 1200 Isolation Resistance Input-to-output 10 mA µF 100 10 V Vdc pF MΩ If Sense(–) is not used, pin 5 must be connected to pin 4 for optimum output voltage accuracy. The Remote On/Off input has an internal pull-up and may be controlled with an open collector (or open drain) interface. An open circuit correlates to a logic high. Consult the application notes for interface considerations. Submit Documentation Feedback 3 PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 PIN DESCRIPTIONS +VI: The positive input for the module with respect to –VI. When powering the module from a –48-V telecom central office supply, this input is connected to the primary system ground. –VI: The negative input supply for the module, and the 0 VDC reference for the Remote On/Off input. When powering the module from a +48-V supply, this input is connected to the 48-V return. Remote On/Off: This input controls the On/Off status of the output voltage. It is either driven low (–VI potential), or left open-circuit. For units identified with the NEN option, applying a logic low to this pin will enable the output. And for units identified with the PEN option, the output will be disabled. VO Adjust: Allows the output voltage to be trimmed by up or down between +10% and –40% of its nominal value. The adjustment method uses a single external resistor. Connecting the resistor between VO Adjust and –VO adjusts the output voltage lower, and placing it between VO Adjust and +VO adjusts the output higher. The calculations for the resistance value follows industry standard formulas. For further information consult the application note on output voltage adustment. +VO: The positive power output with respect to –VO, which is DC isolated from the input supply pins. If a negative output voltage is desired, +VO should be connected to the secondary circuit common and the output taken from –VO. –VO: The negative power output with respect to +VO, which is DC isolated from the input supply pins. This output is normally connected to the secondary circuit common when a positive output voltage is desired. Sense(+): Provides the converter with an output sense capability to regulate the set-point voltage directly at the load. When used with Sense(-), the regulation circuitry will compensate for voltage drop between the converter and the load. The pin may be left open circuit, but connecting it to +VO will improve load regulation. If a series inductor is used for filtering between the module output and load, this pin must be connected directly to the module output to ensure good control design stability. Sense(–): Provides the converter with an output sense capability when used in conjunction with Sense(+) input. For optimum output voltage accuracy this pin should always be connected to –VO. PTEA404120 (Top View) +VO 1 +VI Sense(+) 2 On/Off 3 −VI Adjust Sense(−) −VO 4 Submit Documentation Feedback 8 7 6 5 4 PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 TYPICAL CHARACTERISTICS PTEA404120, VO = 12 V All data listed in the graphs below have been developed from actual products tested at 25°C. This data is considered typical data for the DC-DC Converter. SOA curves represent operating conditions at which internal components are at or below manufacturer's maximum rated operating temperature. For Figure 4 Safe Operating Area, VI = 48 V. For surface mount versions (AS and AZ suffix), multiple plated through-holes must be utilized to achieve comparable thermal performance. Please reference the mechanical specification for more information. EFFICIENCY vs LOAD CURRENT OUTPUT RIPPLE vs LOAD CURRENT 60 VO − Output Voltage Ripple − mVPP 85 VO = 48 V 75 VO = 75 V 70 65 VO 60 75 V 48 V 35 V 55 50 0 0.6 1.2 1.8 2.4 3.0 3.6 6 50 VO = 48 V 40 VO = 35 V 30 20 VO 75 V 48 V 35 V 10 0 IO − Output Current − A 0.6 Figure 1. 1.2 1.8 2.4 3.0 3.6 5 VO = 75 V VO = 48 V 4 3 2 VO 75 V 48 V 35 V 1 VO = 35 V 0 4.2 4.2 0 0 0.6 1.2 1.8 2.4 3.0 IO − Output Current − A IO − Output Current − A Figure 2. Figure 3. 3.6 4.2 AMBIENT TEMPERATURE vs LOAD CURRENT 90 300/400 80 TA − Ambient Temperature − °C Efficiency − % 80 7 VO = 75 V VO = 35 V 90 PD − Power Dissipation − W 95 POWER DISSIPATION vs LOAD CURRENT 200 70 100 60 Natural Convection 50 40 LFM 300/400 200 100 Natural Convection 30 20 0 0.6 1.2 1.8 2.4 3.0 IO − Output Current − A 3.6 4.2 Figure 4. Submit Documentation Feedback 5 PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 APPLICATION INFORMATION Operating Features and System Considerations for the PTEA404120 DC/DC Converter Overcurrent Protection To protect against load faults, these converters incorporate output overcurrent protection. Applying a load to the output that exceeds the converter's overcurrent threshold (see applicable specification) will cause the output voltage to momentarily fold back, and then shut down. Following shutdown the module will periodically attempt to automatically recover by initiating a soft-start power-up. This is often described as a hiccup mode of operation, whereby the module continues in the cycle of successive shutdown and power up until the load fault is removed. Once the fault is removed, the converter automatically recovers and returns to normal operation. Output Overvoltage Protection Each converter incorporates protection circuitry that continually senses for an output overvoltage (OV) condition. The OV threshold is set approximately 20% higher than the nominal output voltage. If the converter output voltage exceeds this 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 can only be done by momentarily removing the input power to the converter. For fail-safe operation and redundancy, the OV protection uses circuitry that is independent of the converter’s internal feedback loop. Overtemperature Protection Overtemperature protection is provided by an internal temperature sensor, which closely monitors the temperature of the converter’s printed circuit board (PCB). If the sensor exceeds a temperature of approximately 115°C, the converter will shut down. The converter will then automatically restart when the sensed temperature drops back to approximately 105°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. Undervoltage Lockout The Undervoltage lockout (UVLO) is designed to prevent the operation of the converter until the input voltage is at the minimum input voltage. This prevents 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 circuitry also overrides the operation of the Remote On/Off control. Primary-Secondary Isolation These converters incorporate electrical isolation between the input terminals (primary) and the output terminals (secondary). All converters are production tested to a withstand voltage of 2000 VDC. This specification 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 data sheet Pin Descriptions section provides guidance as to the correct reference that must be used for the external control signals. 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 10 A, is recommended. Active current limiting can be implemented with a current limited Hot-Swap controller. 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 typical characteristics). 6 Submit Documentation Feedback PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 Differential Remote Sense The remote sense pins allows the converter to precisely regulate the DC output voltage at a remote location. This might be a power plane on an inner layer of the host PCB. Connecting Sense(+) directly to +VO, and Sense(–) to –VO will improve output voltage accuracy. In the event that the sense pins are left open-circuit, an internal 10-Ω resistor between each sense pin and its corresponding output prevents an excessive rise in the output voltage. For practical reasons, the amount of IR voltage compensation should be limited to 0.5 V maximum. The remote sense feature is designed to compensate for limited amounts of IR voltage drop. It is not intended to compensate for the forward drop of a non-linear or frequency dependent components that may be placed in series with the converter output. Examples of such components include OR-ing diodes, filter inductors, ferrite beads, and fuses. Enclosing these components with the remote sense connections effectively places them inside the regulation control loop, which can affect the stability of the regulator. Using the Remote On/Off Function on the PTEA404120 DC/DC Converter For applications requiring output voltage On/Off control, the PTEA404120 DC/DC converter incorporate a Remote On/Off control (pin 2). This feature can be used to switch the module off without removing the applied input source voltage. When placed in the Off state, the standby current drawn from the input source is typically reduced to 3 mA. Negative Output Enable (NEN) Models using the negative enable option, the Remote On/Off (pin 2) control must be driven to a logic low voltage for the converter to produce an output. This is accomplished by either permanently connecting pin 2 to –VI (pin 3), or driving it low with an external control signal. Table 1 shows the input requirements of pin 2 for those modules with the NEN option. Table 1. On/Off Control Requirements for Negative Enable MAX UNITS VIH Disable PARAMETER MIN 2.4 TYP 20 V VIL Enable –0.2 0.8 Vo/c Open-Circuit II Pin 2 at –VI 9 15 –0.75 Submit Documentation Feedback mA 7 PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 Positive Output Enable (PEN) For those models with the positive enable (PEN) option, leaving pin 2 open circuit, (or driving it to an equivalent logic high voltage), will enable the converter output. This allows the module to produce an output voltage whenever a valid input source voltage is applied to +VI with respect to –VI. If a logic-low signal is then applied to pin 2 the converter output is disabled. Table 2 gives the input requirements of pin 2 for modules with the PEN option. Table 2. On/Off Control Requirements for Positive Enable PARAMETER MIN TYP MAX UNITS V VIH Enable 4.5 20 VIL Disable –0.2 0.8 Vo/c Open-Circuit II Pin 2 at –VI 5 7 –0.5 mA Notes: 1. The Remote On/Off control uses –VI (pin 3) as its ground reference. All voltages are with respect to –VI. 2. An open-collector device (preferably a discrete transistor) is recommended. A pull-up resistor is not required. If one is added the pull-up voltage should not exceed 20 V. Caution:Do not use a pull-resistor to +VI (pin 1). The remote On/Off control has a maximum input voltage of 20 V. Exceeding this voltage will overstress, and possibly damage, the converter. 3. The Remote On/Off pin may be controlled with devices that have a totem-pole output. This is provided the output high level voltage (VOH) meets the module's minimum VIH specified in Table 1. If a TTL gate is used, a pull-up resistor may be required to the logic supply voltage. 4. The converter incorporates an undervoltage lockout (UVLO). The UVLO keeps the converter off until the input voltage is close to the minimum specified operating voltage. This is regardless of the state of the Remote On/Off control. Consult the product specification for the UVLO input voltage thresholds. 8 Submit Documentation Feedback PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 PTEA404120P 2 1=Disable −VI Remote On/Off Q1 BSS138 3 −VI Figure 5. Recommended Control or Remote On/Off Input Turn-On: With a valid input source voltage applied, the converter produces a regulated output voltage within 10 ms of the output being enabled. Figure 6 shows the output response of the PTEA following the removal of the logic-low signal from the Remote On/Off (pin 2); see Figure 5. This corresponds to the drop in Q1 VGS in Figure 6. Although the rise-time of the output voltage is short (<5 ms), the indicated delay time will vary depending upon the input voltage and the module’s internal timing. The waveforms were measured with 48 VDC input voltage, and a 4-A resistive load. VO (5 V/div) Q1 Vgs (5 V/div) T − Time − 4 ms/div Figure 6. Power Up Adjusting the Output Voltage of the 50-W Rated PTEA404120 Isolated DC/DC Converter The output voltage adjustment of the PTEA404120 isolated DC/DC converter follows the standard adopted by popular 1/8-brick DC/DC converters. Adjustment is accomplished with a single external resistor that can adjust the output voltage from –40% to +10% of the nominal set-point voltage. The placement of the resistor determines the direction of adjustment, up or down, and the value of the magnitude of adjustment. To ensure good VO set-point accuracy, a 1% maximum tolerance resistor is recommended. Adjust Up: To increase the output voltage add a resistor, R1, between VO Adjust (pin 6) and Sense(+) (pin 7). Adjust Down: Add a resistor, (R2), between VO Adjust (pin 6) and Sense(–) (pin 5). Refer to Figure 7 for the placement of the required resistor, R1 or (R2). The values of R1 [adjust up], and (R2) [adjust down], can be calculated using the following formulas. 5.11 V O (100 ) D%) 511 R1 + * * 10.22 (kW) 1.225 D% D% Submit Documentation Feedback (1) 9 PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 (R2) + 5.11 100 * 10.22 (kW) D% (2) Where: ∆% = Amount of adjustment in % VO = Original set-point voltage Notes: 1. Use only a single 1% resistor in either the R1 or (R2) location. Place the resistor as close to the converter as possible. 2. If the output voltage is increased, the maximum load current must be derated according to the following equation. V I O(rated) I O(max) + O VA (3) Where: VO = Original set-point voltage VA = Adjusted output voltage (measured between pins 8 and 4) In any instance, the load current must not exceed the converter's maximum rated output current of 4.2 A. 3. The overvoltage threshold is fixed, and is set approximately 20% above the nominal output voltage. Adjusting the output voltage higher reduces the voltage margin between the adjusted output voltage and the overvoltage (OV) protection threshold. This could make the module sensitive to OV fault detection, as a result of random noise and load transients. Sense (+) 7 Sense(+) 1 +V I +VO PTEA404120N 3 8 6 −VO 4 2 CO 330 µF Adjust −VI Remote On/Off R1 Adjust Up Sense(–) + +VI −VI +VO (R2) Adjust Down −VO 5 Sense (–) Figure 7. 10 Submit Documentation Feedback L O A D PTEA404120 www.ti.com SLTS274A – DECEMBER 2006 – REVISED JANUARY 2007 Table 3. Adjustment Resistor Values Adjusted Output Voltage (V) Trim-Up RADJ Trim-Down RADJ VO (nom) % Adjust (V) 12 V 12 V R1 (kΩ) 12 V R2 (kΩ) +10 13.200 489 - +9 13.080 539 - +8 12.960 602 - +7 12.840 682 - +6 12.720 789 - +5 12.600 939 - +4 12.480 1164 - +3 12.360 1538 - +2 12.240 2287 - +1 12.120 4535 - 0 12.000 Open - –1 11.880 - 501 –2 11.760 - 245 –3 11.640 - 160 –4 11.520 - 118 –5 11.400 - 92.0 –6 11.280 - 74.9 –7 11.160 - 62.8 –8 11.040 - 53.6 –9 10.920 - 46.6 –10 10.800 - 40.9 –11 10.680 - 36.2 –12 10.560 - 32.4 –13 10.440 - 29.1 –14 10.320 - 26.4 –15 10.200 - 23.7 –16 10.080 - 21.5 –17 9.960 - 19.8 –18 9.840 - 18.2 –19 9.720 - 16.7 –20 9.600 - 15.4 –25 9.000 - 10.2 –30 8.400 - 6.81 –35 7.800 - 4.32 –40 7.200 - 2.54 Submit Documentation Feedback 11 PACKAGE OPTION ADDENDUM www.ti.com 31-Jan-2007 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty PTEA404120N2AD ACTIVE DIP MOD ULE EAW 8 15 Pb-Free (RoHS) Call TI N / A for Pkg Type PTEA404120P2AD ACTIVE DIP MOD ULE EAW 8 15 Pb-Free (RoHS) Call TI N / A for Pkg Type Lead/Ball Finish MSL Peak Temp (3) (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), Pb-Free (RoHS Exempt), 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. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. 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. 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