SRS4033x010xxx 36-75V Input, 3.3V/10A Output Leading the Advancement of Power Conversion 3.3V 10A Sixteenth Brick Converter Features High Efficiency: 90.5% (3.3V/10A) Excellent thermal performance Over-voltage, over-current, short-circuit, and over temperature protection Monotonic start-up No minimum load required Fixed frequency operation Basic Insulation UL 60950-1 2nd edition recognized Options Part Numbering System Baseplate Auto-restart after fault shutdown Negative/Positive enable logic Various lead lengths Series Name Input Voltage Output Voltage ON/OFF Logic Output Current Pin Feature Electrical Options SRS 4 033 N 010 N 2 SRS 4: 36-75V Unit: 0.1V 033: 3.3V P: positive N: negative Unit: A 010:10A Regular K: 0.110" N: 0.145" R: 0.180" S: SMT* Mechanical Options 6 0: latch-up 2: auto-restart RoHS6 Compliant 5: open frame 6: baseplate *: SMT pins are metal block pins at the same locations as the through-hole pins. The recommended diameter for pad/stencil opening and solder mask opening for these pins is 0.12''. Absolute Maximum Rating Excessive stresses over these absolute maximum ratings can cause permanent damage to the converter. Operation should be limited to the conditions outlined under the Electrical Specification Section. Parameter Input Voltage (continuous) Input Voltage ( < 100ms, operating) Input Voltage (continuous, non-operating) I/O Isolation Voltage Operating Ambient Temperature (See Thermal Consideration section) Storage Temperature Symbol Min Max Unit Vi Vi Vi -0.5 - 75 100 100 2,250 Vdc Vdc Vdc Vdc To -40 85* C Tstg -55 125 C * Derating curves provided in this datasheet end at 85C ambient temperature. Operation above 85C ambient temperature is allowed provided the temperatures of the key components or the baseplate do not exceed the limit stated in the Thermal Considerations section. UL is a registered trademark of Underwriters Laboratory Inc. www.netpowercorp.com Datasheet SRS4033x010xxx 03-21-2014 1 SRS4033x010xxx 36-75V Input, 3.3V/10A Output Leading the Advancement of Power Conversion Electrical Specifications These specifications are valid over the converter's full range of input voltage, resistive load, and operating temperature unless noted otherwise. Input Specifications Parameter Input Voltage Input Current Quiescent Input Current (Typical Vin) Standby Input Current Input Reflected-ripple Current, Peak-to-peak (5 Hz to 20 MHz, 12 H source impedance) Input Ripple Rejection Input Turn-on Voltage Threshold Input Turn-off Voltage Threshold Input Voltage ON/OFF Control Hysteresis Output Specifications Parameter Output Voltage Set Point Output Voltage Set Point Accuracy (Vi = Typical Vin; Io = Io,max; Ta = 25C) Output Voltage Set Point Accuracy (over all conditions) Output Regulation: Line Regulation ( full range input voltage, 1/2 full load) Load Regulation (full range load, Typical Vin) Temperature (Ta = -40C to 85 C) Output Current Output Power Efficiency (Typical Vin; Io,max, TA = 25C) Output ripple frequency Output Ripple and Noise Voltage RMS Peak-to-peak (5 Hz to 20 MHz bandwidth, Typical Vin) External Load Capacitance Startup Delay, duration from enabling signal to Vo reaches 10% of its set point. (Typical Vin; Io,max, TA = 25C ) Startup Time, duration for Vo to rise from 10% of its set point to within its regulation band. (Typical Vin, Io,max, TA = 25C ) Output Over Current Protection Set Point / Io,max Output Over Voltage Protection Set Point* / Vo_typical Output Trim Range in % of Vo_typical Output Remote Sense Range in % of Vo_typical Dynamic Response (Typical Vin; Ta = 25C; Load transient 0.1A/s) Load steps from 50% to 75% of full load: Peak deviation Settling time (within 10% band of Vo deviation) Load step from 50% to 25% of full load Peak deviation Settling time (within10% band of Vo deviation) Symbol Min Typical Max Unit Vi Iin,max Iin,qsnt Iin,stdby 36 - 48 40 1 75 1.3 60 3 Vdc A mA mA - - 10 - 34 30 35 32 3 36 34 dB V V V Symbol Min Typical Max Unit Vo mA 3.3 V - -1.5 +1.5 %Vo - -3 +3 %Vo Io Po 0 0 0.05 0.05 0.1 - 0.2 0.2 10 33 %Vo %Vo %Vo A W - 90.5 - % - 280 300 320 kHz - - - - - 25 60 15,000 mVrms mVp-p F 103 115 80 2 ms 4 ms 125 - 140 135 110 10 % % % % 4 100 %Vo s 4 100 %Vo s www.netpowercorp.com Datasheet SRS4033x010xxx 03-21-2014 2 SRS4033x010xxx 36-75V Input, 3.3V/10A Output Leading the Advancement of Power Conversion General Specifications Parameter Symbol Min Typ Max Unit VON/OFF ION/OFF 0 - - 1.2 1.0 V mA VON/OFF ION/OFF - 3.5 10 1200 - 15 50 - V A pF M Remote Enable Logic Low: ION/OFF = 1.0mA VON/OFF = 0.0V ION/OFF = 0.0A Leakage Current Isolation Capacitance Isolation Resistance Calculated MTBF (Telecordia SR-332, 2011, Issue 3), full load, 40C, 60% upper confidence level, typical Vin Logic High: 11.6 106 -hour Efficiency (%) Input Current (A) Characteristic Curves Output Current (A) Input Voltage (V) Figure 2. Input Characteristics Output Control (5V/div) Output Voltage Ripple (100mV/div) Output Voltage (1V/div) Figure 1. Efficiency vs. Load Current (25C) Time (2ms/div) Time (2s/div) Figure 3. Start-Up from Enable Control (Typical input voltage and Full load) Figure 4. Output Ripple Voltage at Full Load www.netpowercorp.com Datasheet SRS4033x010xxx 03-21-2014 3 SRS4033x010xxx 36-75V Input, 3.3V/10A Output Output Current (2A/div) Output Current (2A/iv) Output Voltage (200mV/div) Output Voltage (200mV/div) Leading the Advancement of Power Conversion Time - t (100s/div) Time - t (100s/div) Figure 5. Transient Load Response (Typical Vin, 75% to 50% full load step at a slew rate 0.1A/s) Figure 6. Transient Load Response (Typical Vin, 50% to 75% full load step at a slew rate 0.1A/s) 155 Output Current (A) 140 110 80 60 Airflow Direction 1 4 2 Air Flow 3 Ambient Air Temperature (C) Figure 7. Derating Curve for Airflow Direction 1 (Ref. Figure. 8 for Airflow Direction; typical Vin, open frame, unit soldered onto a fixture board.) Figure 8. Thermal Image for Airflow Direction 1 (10A output, 55C ambient, OLFM, typical Vin, open frame, unit soldered onto a fixture board.) www.netpowercorp.com Datasheet SRS4033x010xxx 03-21-2014 4 SRS4033x010xxx 36-75V Input, 3.3V/10A Output Leading the Advancement of Power Conversion Feature Descriptions ON/OFF Remote ON/OFF The converter can be turned on and off by changing the voltage between the ON/OFF pin and Vin(-). The SRS4 Series of converters are available with factory selectable positive logic and negative logic. Vin() For the negative control logic, the converter is ON when the ON/OFF pin is at a logic low level and OFF when the ON/OFF pin is at a logic high level. For the positive control logic, the converter is ON when the ON/OFF pin is at a logic high level and OFF when the ON/OFF pin is at a logic low level. Figure 9. Opto Coupler Enable Circuit ON/OFF With the internal pull-up circuitry, a simple external switch between the ON/OFF pin and Vin(-) can control the converter. A few example circuits for controlling the ON/OFF pin are shown in Figures 9, 10 and 11. The logic low level is from 0V to 1.2V and the maximum sink current during logic low is 1mA. The external switch must be capable of maintaining a logic-low level while sinking up to this current. The logic high level is from 3.5V to 15V. The converter has an internal pull-up circuit that ensures the ON/OFF pin at a high logic level when the leakage current at ON/OFF pin is no greater than 50A. Vin() Figure 10. Open Collector Enable Circuit TTL/ CMOS ON/OFF Vin() Remote SENSE The remote SENSE pins are used to sense the voltage at the load point to accurately regulate the load voltage and eliminate the impact of the voltage drop in the power distribution path. Figure 11. Direct Logic Drive Output Voltage Adjustment (Trim) SENSE(+) and SENSE(-) pins should be connected between the points where voltage regulation is desired. The voltage between the SENSE pins and the output pins must not exceed the smaller of 0.5V or 10% of typical output voltage. [Vout(+) - Vout(-)] - [SENSE(+) - SENSE (-)] < MIN{0.5V, 10%Vo} When remote sense is not used, the SENSE pins should be connected to their corresponding output pins. If the SENSE pins are left floating, the converter will deliver an output voltage slightly higher than its specified typical output voltage. The trim pin allows the user to adjust the output voltage set point. To increase the output voltage, an external resistor is connected between the TRIM pin and SENSE(+). To decrease the output voltage, an external resistor is connected between the TRIM pin and SENSE(-). The output voltage trim range is 80% to 110% of the specified typical output voltage. The circuit configuration for trim down operation is shown in Figure 12. To decrease the output voltage, the value of the external resistor should be Rdown ( 511 10 .22 )( k ) www.netpowercorp.com Datasheet SRS4033x010xxx 03-21-2014 5 SRS4033x010xxx 36-75V Input, 3.3V/10A Output Leading the Advancement of Power Conversion Input Under-Voltage Lockout Where ( Vnom Vadj Vnom ) 100 and Vnom = Typical Output Voltage Vadj = Adjusted Voltage The circuit configuration for trim up operation is shown in Figure 13. To increase the output voltage, the value of the resistor should be: Rup ( Where This feature prevents the converter from starting until the input voltage reaches the turn-on voltage threshold, and keeps the converter running until the input voltage falls below the turn-off voltage threshold. Both turn-on and turn-off voltage thresholds are defined in the Input Specifications table. The hysteresis prevents oscillations. Output Over-Current Protection (OCP) This converter can be ordered in either latch-off or autorestart version upon OCP, OVP, and OTP. 5.11Vo(100 ) 511 10.22 )( k ) With the latch-off version, the converter will latch off 1.225 when the load current exceeds the limit. The converter can be restarted by toggling the ON/OFF switch or Vo = Typical Output Voltage recycling the input voltage. This equation applies to typical output voltage of 1.5V or higher. As the output voltage at the converter output terminals are higher than the specified typical level when using the trim up and/or remote sense functions, it is important to make sure that the voltage at the output terminals does exceed the maximum power rating of the converter as given in the Specifications table. With the auto-restart version, the converter will operate in a hiccup mode (repeatedly try to restart) until the cause of the over-current condition is cleared. Output Over-Voltage Protection (OVP) With the latch-off version, the converter will latch off when the output voltage exceeds the limit. The converter can be restarted by toggling the ON/OFF switch or recycling the input voltage. SENSE(+) TRIM Rdown Load Vo(+) With the auto-restart version, the converter will operate in a hiccup mode (repeatedly try to restart) until the cause of the over-voltage condition is cleared. SENSE(-) Vo() Over Temperature Protection (OTP) Figure 12. Circuit to Decrease Output Voltage Vo(+) TRIM SENSE(-) Rup Load SENSE(+) With the latch-off version, the converter will shut down and latch off if an over-temperature condition is detected. The converter has a temperature sensor located at a carefully selected position in the converter circuit board, which represents the thermal condition of key components of the converter. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensor reaches 120C. The module can be restarted by toggling the ON/OFF switch or recycling the input voltage. Vo() With the auto-restart version, the converter will resume operation after the converter cools down. Figure 13. Circuit to Increase Output Voltage www.netpowercorp.com Datasheet SRS4033x010xxx 03-21-2014 6 SRS4033x010xxx 36-75V Input, 3.3V/10A Output Leading the Advancement of Power Conversion generate the derating curves with the consideration for long term reliability. Design Considerations As with any DC/DC converter, the stability of the SRS4 converters may be compromised if the source impedance is too high or inductive. It's desirable to keep the input source ac-impedance as low as possible. Although the converters are designed to be stable without adding external input capacitors for typical source impedance, it is recommended to add 100 F low ESR electrolytic capacitors at the input of the converter for each 100W output power, which reduces the potential negative impact of the source impedance on the converter stability. These electrolytic capacitors should have sufficient RMS current rating over the operating temperature range. The converter is designed to be stable without additional output capacitors. To further reduce the output voltage ripple or improve the transient response, additional output capacitors are often used in applications. When additional output capacitors are used, a combination of ceramic capacitors and tantalum/polymer capacitors shall be used to provide good filtering while assuring the stability of the converter. Safety Considerations The thermal derating curves are highly influenced by the test conditions. One of the critical variables is the interface method between the converter and the test fixture board. There is no standard method in the industry for the derating tests. Some suppliers use sockets to plug in the converter, while others solder the converter into the fixture board. It should be noticed that these two methods produce significantly different results for a given converter. When the converter is soldered into the fixture board, the thermal performance of the converter is significantly improved compared to using sockets due to the reduction of the contact loss and the thermal impedance from the pins to the fixture board. Other factors affecting the results include the board spacing, construction (especially copper weight, holes and openings) of the fixture board and the spacing board, temperature measurement method and ambient temperature measurement point. The thermal derating curves in this datasheet are obtained using a PWB fixture board and a PWB spacing board with no opening, a board-to-board spacing of 1", and the converter is soldered to the test board with thermal relieves. Note that the natural convection condition was measured at 0.05 m/s to 0.15 m/s (10ft./min. to 30 ft./min. The SRS4 Series of converters are designed in accordance with EN 60950 Safety of Information Technology Equipment Including Electrical Equipment. The converters are recognized by UL in both USA and Canada to meet the requirements in UL 60950, Safety of Information Technology Equipment and applicable Canadian Safety Requirement, and ULc 60950. Flammability ratings of the PWB and plastic components in the converter meet 94V-0. To protect the converter and the system, an input line fuse is highly recommended on the un-grounded input end. Heat Transfer without a Baseplate With single-board DC/DC converter designs, convection heat transfer is the primary cooling means for converters without a baseplate. Therefore, airflow speed should be checked carefully for the intended operating environment. Increasing the airflow over the converter enhances the heat transfer via convection. Figure 14 shows a recommended temperature monitoring point for open frame modules. For reliable operation, the temperature at this location should not continuously exceed 120 C. Thermal Considerations The SRS4 Series of converters can operate in various thermal environments. Due to the high efficiency and optimal heat distribution, these converters exhibit excellent thermal performance. The maximum allowable output power of any power converter is usually determined by the electrical design and the maximum operating temperature of its components. The SRS4 Series of converters have been tested comprehensively under various conditions to Figure 14. Temperature Monitoring Location www.netpowercorp.com Datasheet SRS4033x010xxx 03-21-2014 7 SRS4033x010xxx 36-75V Input, 3.3V/10A Output Leading the Advancement of Power Conversion The SRS4 Series of converters have the options of using a baseplate for enhanced thermal performance. The typical height of the converter with the baseplate option is 0.50''. The use of an additional heatsink or cold-plate can further improve the thermal performance of the converter. EMC Considerations The EMC performance of the converter is related to the layout and filtering design of the customer board. Careful layout and adequate filtering around the converter are important to confine noise generated by the switching actions in the converter and to optimize system EMC performance. For reliable operation, the baseplate temperature should not continuously exceed 100 C. Mechanical Information PIN Function 1 Vin(+) 2 ON/OFF 3 Vin(-) 4 Vo(-) 5 Sense(-) 6 Trim 7 Sense(+) 8 Vo(+) Figure 15. Open Frame Converter www.netpowercorp.com Datasheet SRS4033x010xxx 03-21-2014 8 SRS4033x010xxx 36-75V Input, 3.3V/10A Output Leading the Advancement of Power Conversion Figure 16. Converter with a Baseplate Notes 1) 2) 3) 4) 5) 6) 7) 8) All dimensions in mm (inches) Tolerances: .x + .5 (.xx + 0.02) .xx + .25 (.xxx + 0.010) Regular input and function pins are 1.02mm (0.040") dia. with +/- 0.10mm (0.004") tolerance; the standoff shoulders are 2.00mm (0.078") dia. with +/- 0.15mm (0.006") tolerance. Output pins are 1.57 mm (0.062") dia. with +/- 0.10mm (0.004") tolerance; the standoff shoulders are 2.46mm (0.097") dia. with +/- 0.15mm (0.006") tolerance. All pins are coated with 90%/10% solder, Gold, or Matte Tin finish with Nickel under plating. Weight: 15 g open frame converter 30 g baseplated converter Workmanship meets or exceeds IPC-A-610 Class II Torque applied on screw should not exceed 6in-lb. (0.7 Nm) Baseplate flatness tolerance is 0.10mm (0.004") TIR for surface www.netpowercorp.com Datasheet SRS4033x010xxx 03-21-2014 9 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: NetPower Technologies: SRS4033N010R26