Using the TPS40140EVM-003 User's Guide Literature Number: SLVU219A August 2007 – Revised November 2010
User's Guide SLVU219A – August 2007 – Revised November 2010 Using the TPS40140EVM-003 A 32-A Single Output Two-Phase Stackable Synchronous Buck Converter The TPS40140EVM-003 evaluation module (EVM) is a single output two-phase synchronous buck converter. The EVM delivers 1.5 V at 32 A. The module uses the TPS40140 dual or 2-phase stackable synchronous buck controller. The EVM is also stackable with the other EVM to construct a multiphase converter.
TPS40140EVM-003 Electrical Performance Specifications www.ti.com 2 TPS40140EVM-003 Electrical Performance Specifications Table 1. TPS40140EVM-003 Electrical and Performance Specifications PARAMETER CONDITIONS MIN TYP MAX UNIT 13.2 V Input Characteristics Input Voltage Range 10.8 Max Input Current VIN = 10.8 V, IOUT = 32 A 4.98 A No-Load Input Current VIN = 13.2 V, IOUT = 0 A 130 mA Output Characteristics (VOUT) Output Voltage Output Voltage Regulation 1.51 V Line Regulation (10.
Schematic Schematic + + + + 3 www.ti.com Figure 1.
Test Set Up www.ti.com 4 Test Set Up 4.1 Recommended Test Equipment 4.1.1 Voltage Source VIN The input voltage source (VIN) should be a 0 V to 15V variable DC source capable of 10 ADC. Connect VIN to J1 as shown in Figure 2. 4.1.2 Meters V1: VIN, 0 V to 15V voltmeter V2: VOUT, 0 V to 5V voltmeter I1: 0 V to 10A current meter 4.1.3 Load LOAD The Output Load (LOAD) should be an Electronic Constant Current Mode Load capable of 0–40Adc at 1.5V 4.1.
Test Set Up 4.1.6 www.ti.com 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 required 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. 4.
Test Set Up www.ti.com Set Up Diagram - + Vin - V1 I1 + FAN _ - + V2 LO AD + 4.2.4 Figure 2.
Test Set Up www.ti.com Metal Ground Barrel Probe Tip TP9 TP10 Tip and Barrel Output Ripple Measurement Figure 3. Output Ripple Measurement 4.3 Start Up and Test Procedure 1. Ensure LOAD is set to constant current mode and to sink 0 Adc. 2. Increase VIN from 0 V to 10.8 Vdc, VOUT should be in regulation per Table 1. Continue increasing VIN to 12 V. 3. Vary LOAD from 0 to 32 Adc, VOUT should remain in regulation per Table 1. 4. Vary VIN from 10.8 Vdc to 13.
Test Set Up www.ti.com 4.5 4.5.1 EVM Configuration Two Phase Single Output Configuration (Default) JP1 TRK1 JP2 RT JP3 UVLO JP4 PSELIN JP5 ILIM1 Figure 4. Default Configuration JP4 is shorted with a jumper and others are left open. In this configuration, the EVM operates as a two phase single output converter. 4.5.2 Disabling the Output JP3 allows the user to disable or enable the output. The output is disabled by shorting JP3 with a Jumper.
Test Set Up www.ti.com If two EVM boards are stacked together, the other EVM is configured as a slave as shown in Figure 7. JP1 TRK1 JP2 RT JP3 UVLO JP4 PSELIN JP5 ILIM1 Figure 7. Configure the EVM as a Slave for Stackable Operation If more than two EVM boards are stacked, for example three, the two slave EVMs have slightly different settings.
Test Set Up www.ti.com 4.6 Test Points Several test points are located around the board. These can be used to sense what is occurring at different points of the converter. Table 2 lists these test points and what they are used for. Table 2. List of Test Points NAME 4.
TPS40140EVM-003 Typical Performance Data and Characteristic Curves 5 www.ti.com TPS40140EVM-003 Typical Performance Data and Characteristic Curves Figure 9 through Figure 13 present typical performance curves for the TPS40140EVM-003. 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.
TPS40140EVM-003 Typical Performance Data and Characteristic Curves www.ti.com 5.2 Line and Load Regulation OUTPUT VOLTAGE vs LOAD CURRENT AND LINE VOLTAGE 1.510 10.8 12.0 1.505 13.2 Output Voltage (V) 1.500 1.495 1.490 1.485 1.480 1.475 0 5 10 15 20 25 30 35 Load Current (A) Figure 11. TPS40140EVM-003 VOUT = 1.5-V Line and Load Regulation 5.
TPS40140EVM-003 Typical Performance Data and Characteristic Curves 5.4 www.ti.com Transient Response Figure 13. Transient Response 10 A Step, 2.5 A/ms, 50 mV/div Ch1: VOUT; Ch4: IOUT Figure 14. Ouput Ripple Figure 15. SW Node Figure 16. Turn ON Figure 17.
EVM Assembly Drawings and Layout www.ti.com 6 EVM Assembly Drawings and Layout Figure 18 through Figure 22 show the design of the TPS40140EVM-003 printed circuit board. The EVM has been designed using a four layer, 2 oz copper-clad circuit board with all components on the top side to allow the user to easily view, probe and evaluate the TPS40140 control IC in a practical application.
EVM Assembly Drawings and Layout www.ti.com Figure 19. TPS40140EVM-003 Top Copper (Viewed from Top) Figure 20.
EVM Assembly Drawings and Layout www.ti.com Figure 21. TPS40140EVM-003 Layer 3 Copper (X-Ray View from Top) Figure 22.
List of Materials 7 www.ti.com List of Materials Table 3 lists the EVM components as configured according to the schematic shown in Figure 1. Table 3. TPS40140EVM-003 List of Materials COUNT 18 REFDES DESCRIPTION PART NUMBER MFR 6 C1–C3, C25–C27 Capacitor, ceramic, 16 V, X5R, 20%, 22 mF Std Std 4 C12–C15 Capacitor, SP cap, 2 V, 0.006 Ω, 20%, 330 mF, 7343 EEFSX0D331XE Panasonic 1 C16 Capacitor, ceramic, 6.
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