Using the TPS54386EVM User's Guide March 2008 Power Supply MAN SLUU286 Using the TPS54386EVM User's Guide Literature Number: SLUU286 March 2008 User's Guide SLUU286 - March 2008 A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 1 Introduction The TPS54386EVM evaluation module (EVM) is a dual non-synchronous buck converter providing fixed 5.0-V and 3.3-V output at up to 2 A each from a 12-V input bus. The EVM is designed to start up from a single supply, so no additional bias voltage is required for start-up. The module uses the TPS54386 Dual Non-Synchronous Buck Converter with Integral High-Side FET. 1.1 Description TPS54386EVM is designed to use a regulated 12-V (+10% / -20%) bus to produce two regulated power rails, 5.0 V and 3.3 V at up to 2 A of load current each. TPS54386EVM is designed to demonstrate the TPS54386 in a typical 12-V bus system while providing a number of test points to evaluate the performance of the TPS54386 in a given application. The EVM can be modified to other input or output voltages by changing some of the components. 1.2 Applications * * * * * 1.3 Non-Isolated Low Current Point of Load and Voltage Bus Converters Consumer Electronics LCD TV Computer Peripherals Digital Set Top Box Features * * * * * * * * 12-V (+10% / -20%) Input Range 5.0-V and 3.3-V Fixed Output Voltage, Adjustable with Resistor Change 2-ADC Steady State Output Current (3 A Peak) 600-kHz Switching Frequency (fixed by TPS54386) Internal Switching MOSFET and External Rectifier Diode Double Sided 2 Active Layer PCB (all components on top side, test point signals routed on internal layers) Active Converter Area Less than 1.8 Square Inches (0.89" x 1.97") Convenient Test Points (used for probing switching waveforms and non-invasive loop response testing) SLUU286 - March 2008 Submit Documentation Feedback A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 3 www.ti.com TPS54386EVM Electrical Performance Specifications 2 TPS54386EVM Electrical Performance Specifications Table 1. Electrical Performance Specifications SYMBOL PARAMETER MIN TYP MAX UNITS Input Characterstics VIN Input coltage IIN Input current No load input current Input UVLO IOUT = min to max VIN_UVLO 9.6 12 13.2 V VIN = nom, IOUT = max - 1.6 2.0 A VIN = nom, IOUT = 0 A - 12 20 mA 4.0 4.2 4.4 V Output Characterstics VOUT1 Output voltage 1 VIN = nom, IOUT = nom 4.85 5.0 5.15 VOUT2 Output voltage 2 VIN = nom, IOUT = nom 3.20 3.3 3.40 Line regulation VIN = min to max - - 1% Load regulation IOUT = min to max - - 1% VOUT_ripple Output voltage ripple VIN = nom, IOUT = max - - IOUT1 Output current 1 VIN = min to max 0 2.0 IOUT2 Output current 2 VIN = min to max 0 2.0 IOCP1 Output over current Channel 1 VIN = nom, VOUT = VOUT1 - 5% 3.1 3.7 4.5 IOCP2 Output over current Channel 2 VIN = nom, VOUT = VOUT2 - 5% 3.1 3.7 4.5 510 630 750 30 V mVpp A Systems Characterstics 4 FSW Switching frequency pk Peak efficiency VIN = nom - 90% - Full load efficiency VIN = nom, IOUT = max - 85% - Top Operating temperature range VIN = min to max, IOUT = min to max 0 25 60 A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter kHz C SLUU286 - March 2008 Submit Documentation Feedback www.ti.com Schematic Schematic + 3 Figure 1. TPS54386EVM Schematic Note: For reference only, see Table 3, List of Materials for specific values. SLUU286 - March 2008 Submit Documentation Feedback A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 5 www.ti.com Schematic 3.1 Sequencing Jump (JP3) The TPS54386EVM provides a 3-pin, 100-mil header and shunt for programming the TPS54386's sequencing function. Placing the JP3 shunt in the left position connects the sequence pin to BP and sets the TPS54386 controller to sequence Channel 2 prior to Channel 1 when Enable 2 is activated. Placing the JP3 shunt in the right position connects the sequence pin to GND and sets the TPS54386 converter to sequence Channel 1 prior to Channel 1 when Enable 1 is activated. Removing the JP3 shunt disables sequencing and allows Channel 1 and Channel 2 to be enabled independently. 3.2 Enable Jumpers (JP1 and JP2) TPS54386EVM provides separate 3-pin, 100-mil headers and shunts for exercising the TPS54386 Enable functions. When JP3 is removed placing the JP1 shunt in the left position connects EN1 to ground and turns on Output 1 and placing the JP2 shunt in the left position connects EN2 to ground and turns on Output 2. When the JP3 shunt is in the LEFT position, placing the JP2 shunt in the left position connects EN2 to ground and turns on first Output 2 and then Output 1. When the JP3 shunt is in the RIGHT position, placing the JP1 shunt in the left position connects EN1 to ground and turns on first Output 1 and then Output 2. 3.3 Test Point Descriptions Table 2. Test Point Descriptions 6 TEST POINT LABLE TP1 VIN Monitor input voltage USE Section 3.3.1 TP2 GND Ground for input voltage Section 3.3.1 TP3 VOUT1 Monitor VOUT1 Voltage Section 3.3.2 TP4 GND Ground for VOUT1 voltage Section 3.3.2 TP5 GND Ground for Channel B loop monitoring Section 3.3.3 TP6 CHB Channel B for loop monitoring Section 3.3.3 TP7 GND Ground for Channel A loop monitoring Section 3.3.3 TP8 CHA Channel A for loop monitoring Section 3.3.3 TP9 SW1 Monitor switching node of Channel 1 Section 3.3.4 TP10 GND Ground for switch node of Channel 1 Section 3.3.4 TP11 IC_GND Monitor device ground Section 3.3.5 TP12 SW2 Monitor switching node of Channel 2 Section 3.3.6 TP13 GND Ground for switch node of Channel 2 Section 3.3.6 TP14 CHA Channel A for loop monitoring Section 3.3.7 TP15 GND Ground for Channel A loop monitoring Section 3.3.7 TP16 CHB Channel B for loop monitoring Section 3.3.7 TP17 GND Ground for Channel B loop monitoring Section 3.3.7 TP18 VOUT2 Monitor VOUT2 voltage Section 3.3.8 TP19 GND Ground for VOUT2 voltage Section 3.3.8 A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter SECTION SLUU286 - March 2008 Submit Documentation Feedback www.ti.com Schematic 3.3.1 Input Voltage Monitoring (TP1 and TP2) TPS54386EVM provides two test points for measuring the voltage applied to the module. This allows the user to measure the actual module voltage without losses from input cables and connectors. All input voltage measurements should be made between TP1 and TP2. To use TP1 and TP2, connect a voltmeter positive terminal to TP1 and negative terminal to TP2. 3.3.2 Channel 1 Output Voltage Monitoring (TP3 and TP4) TPS54386EVM provides two test points for measuring the voltage generated by the module. This allows the user to measure the actual module output voltage without losses from output cables and connectors. All output voltage measurements should be made between TP3 and TP4. To use TP3 and TP4, connect a voltmeter positive terminal to TP3 and negative terminal to TP4. For Output ripple measurements, TP3 and TP4 allow a user to limit the ground loop area by using the Tip and Barrel measurement technique shown in Figure 3. All output ripple measurements should be made using the Tip and Barrel measurement. 3.3.3 Channel 1 Loop Analysis (TP5, TP6, TP7 and TP8) TPS54386EVM contains a 51- series resistor (R1) in the feedback loop to allow for matched impedance signal injection into the feedback for loop response analysis. An isolation transformer should be used to apply a small (30 mV or less) signal across R1 through TP6 and TP8. By monitoring the ac injection level at TP8 and the returned ac level at TP6, the power supply loop response can be determined. 3.3.4 Channel 1 Switching Waveforms (TP9 and TP10) TPS54386EVM provides a test point and a local ground connection (TP10) for the monitoring of the Channel 1 power stage switching waveform. Connect an oscilloscope probe to TP9 to monitor the switch node voltage for Channel 1. 3.3.5 TPS54386 Device Ground (TP11) TPS54386EVM provides a test point for the device ground. To measure the device pin voltages, connect the ground of the oscilloscope probe to TP11. 3.3.6 Channel 2 Switching Waveforms (TP12 and TP13) TPS54386EVM provides a test point and a local ground connection (TP13) for the monitoring of the Channel 1 power stage switching waveform. Connect an oscilloscope probe to TP12 to monitor the switch node voltage for Channel 1. 3.3.7 Channel 2 Loop Analysis (TP14, TP15, TP16 and TP17) TPS54386EVM contains a 51- series resistor (R10) in the feedback loop to allow for matched impedance signal injection into the feedback for loop response analysis. An isolation transformer should be used to apply a small (30 mV or less) signal across R10 through TP14 and TP16. By monitoring the ac injection level at TP14 and the returned ac level at TP16, the power supply loop response can be determined. 3.3.8 Output Voltage Monitoring (TP18 and TP19) TPS54386EVM provides two test points for measuring the voltage generated by the module. This allows the user to measure the actual module output voltage without losses from output cables and connector losses. All output voltage measurements should be made between TP18 and TP19. To use TP18 and TP19, connect a voltmeter positive terminal to TP18 and negative terminal to TP19. For output ripple measurements, TP18 and TP19 allow a user to limit the ground loop area by using the Tip and Barrel measurement technique shown in Figure 3. All output ripple measurements should be made using the Tip and Barrel measurement. SLUU286 - March 2008 Submit Documentation Feedback A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 7 www.ti.com 4 Test Set Up 4 4 Test Set Up 4.1 Equipment 4.1.1 Voltage Source VIN: The input voltage source (VIN) should be a 0-15 V variable dc source capable of 5 ADC. Connect VIN to J1 as shown in Figure 3. 4.1.2 * * * * 4.1.3 Meters A1: 0-3 ADC, ammeter V1: VIN, 0-15 V voltmeter V2: VOUT1 0-6 V voltmeter V3: VOUT2 0-4 V voltmeter Loads LOAD1: The Output1 Load (LOAD1) should be an electronic constant current mode load capable of 0-2 ADC at 5.0 V LOAD2: The Output2 Load (LOAD2) should be an electronic constant current mode load capable of 0-2 ADC at 3.3 V 4.1.4 Oscilloscope Oscilloscope: A digital or analog oscilloscope can be used to measure the ripple voltage on VOUT. The oscilloscope should be set for 1-M impedance, 20-MHz bandwidth, ac coupling, 1-s/division horizontal resolution, 10-mV/division vertical resolution for taking output ripple measurements. TP3 and TP4 or TP18 and TP19 can be used to measure the output ripple voltages by placing the oscilloscope probe tip through TP3 or TP18 and holding the ground barrel to TP4 or TP19 as shown in Figure 3. For a hands free approach, the loop in TP4 or TP19 can be cut and opened to cradle the probe barrel. Using a leaded ground connection may induce additional noise due to the large ground loop area. 4.1.5 Recommended Wire Gauge VIN to J1: The connection between the source voltage, VIN and J1 of HPA241 can carry as much as 5 ADC. The minimum recommended wire size is AWG #16 with the total length of wire less than 4 feet (2 feet input, 2 feet return). J2 to LOAD1: The power connection between J2 of HPA241 and LOAD1 can carry as much as 2 ADC. The minimum recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot return). J3 to LOAD2: The power connection between J3 of HPA241 and LOAD2 can carry as much as 2 ADC. The minimum recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot return). 4.1.6 Other Fan: This evaluation module includes components that can get hot to the touch, because this EVM is not enclosed to allow probing of circuit nodes, a small fan capable of 200-400 lfm is recommended to reduce component surface temperatures to prevent user injury. The EVM should not be left unattended while powered. The EVM should not be probed while the fan is not running. 8 A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter SLUU286 - March 2008 Submit Documentation Feedback www.ti.com 4 Test Set Up 4.2 Equipment Setup Shown in Figure 2 is the basic test set up recommended to evaluate the TPS54386EVM. Please note that although the return for J1, J2 and JP3 are the same system ground, the connections should remain separate as shown in Figure 2 4.2.1 Procedure 1. Working at an ESD workstation, make sure that any wrist straps, bootstraps or mats are connected referencing the user to earth ground before power is applied to the EVM. Electrostatic smock and safety glasses should also be worn. 2. Prior to connecting the dc input source, VIN, it is advisable to limit the source current from VIN to 5.0 A maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 2. 3. Connect the ammeter A1 (0-5 A range) between VIN and J1 as shown in Figure 2. 4. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 2. 5. Connect LOAD1 to J2 as shown in Figure 2. Set LOAD1 to constant current mode to sink 0 ADC before VIN is applied. 6. Connect voltmeter, V2 across TP3 and TP4 as shown in Figure 2. 7. Connect LOAD2 to J3 as shown in Figure 2. Set LOAD2 to constant current mode to sink 0 ADC before VIN is applied. 8. Connect voltmeter, V3 across TP18 and TP19 as shown in Figure 2. 9. Place fan as shown in Figure 2 and turn on, making sure air is flowing across the EVM. 4.2.2 Diagram FAN Oscilloscope 1MW, AC 20mV / div 20MHz See Tip and Barrel Measurement for Vout ripple + + - V3 LOAD1 5.0V @ 2A V2 + A1 - - VVIN + V1 - LOAD2 3.3V @ 2A + + Figure 2. TPS54386EVM Recommended Test Set-Up SLUU286 - March 2008 Submit Documentation Feedback A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 9 www.ti.com 4 Test Set Up Metal Ground Barrel Probe Tip TP3 / TP18 TP4 / TP19 Tip and Barrel Vout ripple measurement Figure 3. Tip and Barrel Measurement Technique (output ripple measurement using TP3 and TP4 or TP18 and TP19) FAN + + - V3 LOAD1 5.0V @ 2A V2 + A1 - - - VVIN + V1 - LOAD2 3.3V @ 2A + + Isolation Transformer Figure 4. Control Loop Measurement Setup 10 A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter SLUU286 - March 2008 Submit Documentation Feedback www.ti.com 4 Test Set Up 4.3 Start Up / Shut Down Procedure 1. 2. 3. 4. 5. 6. 4.4 Output Ripple Voltage Measurement Procedure 1. 2. 3. 4. 5. 6. 7. 4.5 Increase VIN from 0 V to 12 VDC. Vary LOAD1 from 0 - 2 ADC Vary LOAD2 from 0 - 2 ADC Vary VIN from 9.6 VDC to 13.2 VDC Decrease VIN to 0 VDC Decrease LOAD1 to 0 A. Increase VIN from 0 V to 12 VDC. Adjust LOAD1 to desired load between 0 ADC and 2 ADC. Adjust VIN to desired load between 9.6 VDC and 13.2 VDC. Connect oscilloscope probe to TP3 and TP4 or TP18 and TP19 as shown in Figure 3. Measure output ripple. Decrease VIN to 0 VDC. Decrease LOAD1 to 0 A. Control Loop Gain and Phase Measurement Procedure 1. 2. 3. 4. 5. 6. Connect 1 kHz to 1 MHz isolation transformer to TP6 and TP8 as show in Figure 4. Connect input signal amplitude measurement probe (Channel A) to TP8 as shown in Figure 4. Connect output signal amplitude measurement probe (Channel B) to TP6 as shown in Figure 4. Connect ground lead of Channel A and Channel B to TP5 & TP7 as shown in Figure 4. Inject 30 mV or less signal across R1 through isolation transformer. Sweep frequency from 1 kHz to 1 MHz with 10 Hz or lower post filter. ae ChannelB o 20 LOG c / e ChannelA o 7. Control loop gain can be measured by: 8. Control loop phase is measured by the phase difference between Channel A and Channel B. 9. Control loop for Channel 2 can be measured by making the following substitutions. a. Change TP6 to TP16 b. Change TP8 to TP14 c. Change TP5 to TP17 d. Change TP7 to TP15 10. Disconnect isolation transformer before making any other measurements (signal injection into feedback may interfere with accuracy of other measurements). 4.6 Equipment Shutdown 1. 2. 3. 4. Shut down Shut down Shut down Shut down oscilloscope VIN LOAD1 fan SLUU286 - March 2008 Submit Documentation Feedback A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 11 www.ti.com TPS54386EVM Typical Performance Data and Characteristic Curves 5 TPS54386EVM Typical Performance Data and Characteristic Curves Figure 5 through Figure 9 present typical performance curves for the TPS54386EVM. Since actual performance data can be affected by measurement techniques and environmental variables, these curves are presented for reference and may differ from actual field measurements. 5.1 Efficiency EFFICIENCY(VOUT = 3.3 V) vs LOADCURRENT EFFICIENCY(VOUT = 5.0 V) vs LOADCURRENT 90 95 85 90 9.6 V 9.6 V 75 85 h - Efficiency - % h - Efficiency - % 80 12.0 V 70 65 13.2 V 75 13.2 V 70 60 65 55 60 50 0.10 12.0 V 80 0.48 0.86 1.24 1.62 2.00 0.10 ILOAD - Load Current - A 0.48 0.86 1.24 1.62 2.00 ILOAD - Load Current - A Figure 5. TPS54386EVM Efficiency verse Load Current VIN =9.6-13.2 V, VOUT1 = 5.0 V IOUT1 = 0-2 A, VOUT2 = 3.3 V IOUT2 = 0-2 A 12 A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter SLUU286 - March 2008 Submit Documentation Feedback www.ti.com TPS54386EVM Typical Performance Data and Characteristic Curves 5.2 Line and Load Regulation EFFICIENCY(VOUT1 = 3.3 V) vs LOADCURRENT EFFICIENCY(VOUT2 = 5.0 V) vs LOADCURRENT 3.340 5.020 3.338 12.0 V 5.015 h - Efficiency - % h - Efficiency - % 3.335 3.333 3.330 9.6 V 3.328 13.2 V 9.6 V 12.0 V 5.010 13.2 V 5.005 3.325 3.323 5.000 3.320 0.10 0.48 0.86 1.24 ILOAD - Load Current - A 1.62 2.00 0.10 0.48 0.86 1.24 1.62 2.00 ILOAD - Load Current - A Figure 6. TPS54386EVM Output Voltage verse Load Current VIN =9.6-13.2 V, VOUT1 = 5.0 V IOUT1 = 0-2 A, VOUT2 = 3.3 V IOUT2 = 0-2 A 5.3 Output Voltage Ripple Figure 7. TPS54386EVM Output Voltage Ripple (VIN = 13.2 V, IOUT1 = IOUT2 = 2 A) SLUU286 - March 2008 Submit Documentation Feedback A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 13 www.ti.com TPS54386EVM Typical Performance Data and Characteristic Curves 5.4 Switch Node Figure 8. TPS54386EVM Switching Waveforms VIN = 12 V, IOUT = 2 A Ch1: TP9 (SW1), Ch2: TP12 (SW2) 5.5 Control Loop Bode Plot (low line, VIN = 8 V) GAIN/PHASE vs FREQUENCY(VOUT = 3.3 V, I OUT = 2 A) 100 GAIN/PHASE vs FREQUENCY(VOUT = 5.0 V, I OUT = 2 A) 72 90 90 60 Phase 80 48 Phase 60 45 36 45 0 24 0 12 0 -45 -12 Gain -24 -45 -20 Phase - 0 Gain - dB 20 Phase - Gain - dB 40 -90 -36 Gain -135 -48 -40 -60 -60 0 -90 10 100 1000 -72 -180 0 f - Frequency - Hz 10 100 1000 f - Frequency - Hz Figure 9. TPS54386EVM Gain and Phase vs Frequency 14 A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter SLUU286 - March 2008 Submit Documentation Feedback www.ti.com EVM Assembly Drawings and Layout 6 EVM Assembly Drawings and Layout The following figures (Figure 10 through Figure 12) show the design of the TPS54386EVM printed circuit board. The EVM has been designed using a 4-Layer, 2-oz copper-clad circuit board 3.0" x 3.0" with all components in a 1.15" x 2.15" active area on the top side and all active traces to the top and bottom layers to allow the user to easily view, probe and evaluate the TPS54386 control device in a practical double-sided application. Moving components to both sides of the PCB or using additional internal layers can offer additional size reduction for space constrained systems. Figure 10. TPS54386EVM Component Placement (viewed from top) SLUU286 - March 2008 Submit Documentation Feedback A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 15 www.ti.com EVM Assembly Drawings and Layout Figure 11. TPS54386EVM Top Copper (viewed from top) 16 A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter SLUU286 - March 2008 Submit Documentation Feedback www.ti.com EVM Assembly Drawings and Layout Figure 12. TPS54386EVM Bottom Copper (x-ray view from top) SLUU286 - March 2008 Submit Documentation Feedback A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 17 www.ti.com List of Materials 7 List of Materials Table 3. TPS54386EVM List of Materials 18 QTY REF DES DESCRIPTION MFR PART NUMBER 1 C1 Capacitor, aluminum, 25 V, 20%, 100 F, 0.328 x 0.390 inch Panasonic EEEFC1E101P 2 C10, C11 Capacitor, ceramic, 25 V, X5R, 20%, 10 F, 1210 TDK C3216X5R1E106M 1 C12 Capacitor, ceramic, 10 V, X5R, 20%, 4.7 F, 0805 Std Std 1 C15 Capacitor, ceramic, 25 V, X7R, 20%, 22 nF, 0603 Std Std 2 C2, C20 Capacitor, ceramic, 10 V, X7R, 20%, 0.1 F, 0603 Std Std 4 C3, C4, C18, C19 Capacitor, ceramic, 6.3 V, X5R, 20%, 10 F, 0805 TDK C2012X5R0J106M 2 C5, C17 Capacitor, ceramic, 6.3 V, X5R, 20%, 47 F, 1206 Std Std 2 C7, C14 Capacitor, ceramic, 25 V, X7R, 20%, 470 pF, 0603 Std Std 1 C8 Capacitor, ceramic, 25 V, X7R, 20%, 33 nF, 0603 Std Std 2 C9, C13 Capacitor, ceramic, 25 V, X7R, 20%, 0.047 F, 0603 Std Std 2 D1, D2 Diode, Schottky, 3 A, 30 V, MBRS330T3, SMC On Semi MBRS330T3 2 L1, L2 Inductor, power, 4.38 A, 0.02 , 8.2 H, 0.402 x 0.392 inch Coilcraft MSS1048-822L 2 R1, R10 Resistor, chip, 1/16 W, 5%, 51 , 0603 Std Std 2 R2, R9 Resistor, chip, 1/16 W, 1%, 20 k, 0603 Std Std 2 R3, R8 Resistor, chip, 1/16 W, 5%, 10 , 0603 Std Std 1 R4 Resistor, chip, 1/16 W, 1%, 3.83 k, 0603 Std Std 3 R5, R6, R11 Resistor, chip, 1/16 W, 5%, 0 , 0603 Std Std 1 R7 Resistor, chip, 1/16 W, 1%, 6.49 k, 0603 Std Std 1 R12 Resistor, chip, 1/16 W, 1%, 1.54 k, 0603 Std Std 1 R13 Resistor, chip, 1/16 W, 1%, 3.32 k, 0603 Std Std 3 TP1, TP3, TP18 Test point, red, thru hole, 5010, 0.125 x 0.125 inch Keystone 5010 1 U1** TPS54386PWP, HTSSOP-14 TI TPS54386PWP A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter SLUU286 - March 2008 Submit Documentation Feedback 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. 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