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Using the TPS40322EVM-679

User's Guide

Literature Number: SLUU506

June 2011

Summary of content (24 pages)

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Using the TPS40322EVM-679 User's Guide Literature Number: SLUU506 June 2011
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User's Guide SLUU506 – June 2011 Dual Output Synchronous Buck Converter 1 Introduction The TPS40322EVM-679 evaluation module (EVM) is a dual output synchronous buck converter. The EVM delivers 1.2 V at 10 A and 1.8 V at 10 A from a 12-V nominal DC input voltage. The module uses the TPS40322 Dual Output or Two-Phase Synchronous Buck Controller and the CSD86330Q3D Synchronous Buck NexFET™ Power Block in a 500-kHz application. 2 Description TPS40322EVM-679 is designed to use a regulated 8.0-VDC to 15.
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Electrical Performance Specifications www.ti.com 3 Electrical Performance Specifications Table 1. TPS40322EVM-679 Electrical Performance Specifications PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input Characteristics VIN Voltage range Maximum input current 8.0 VIN = VIN(min), IOUT1 = IOUT2 = 10 A No-load input current 12.0 15.0 V 4.
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Schematic Schematic + + + + + 4 www.ti.com Figure 1.
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Test Setup www.ti.com 5 Test Setup 5.1 Test Equipment Voltage Source: Input DC source, the input voltage source (VIN) shall be a 0-V to 15-V variable DC source capable of 10 ADC. Connect VIN to J1 as shown in Figure 2. Multimeters: Five Multimeters 1. Volt meter, V1, 0 VDC to 5 VDC. 2. Volt meter, V2, 0 VDC to 5 VDC. 3. Volt meter, V3, 0 VDC to 15 VDC. 4. Current meter, A1, 0 ADC to 10 ADC. (Optional: to improve current measurement use a 0-mV to 100-mV voltmeter and a 1-mV/A shunt) 5.
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Test Setup www.ti.com LOAD1 LOAD2 A1 + - V1 + A2 + - V2 + - V3+ - VIN - + TEXAS INSTRUMENTS Figure 2. TPS40322EVM-679 Recommended Test Set Up Figure 3.
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Test Setup www.ti.com 5.3 List of Test Points Table 2.
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Test Procedure www.ti.com 6 Test Procedure 6.1 Load Regulation Measurement Procedure 1. Ensure LOAD1 and LOAD2 are set to constant-current mode and to set to sink 0 A. 2. Increase VIN from 0 V to 12 VDC. VOUT1 and VOUT2 should be in regulation once VIN is 7.8 V or greater. 3. Set LOAD2 to 10 A. 4. Vary LOAD1 from 0 A to 10 A. VOUT1 and VOUT2 should remain within regulation per Table 1. 5. Set LOAD1 to 10 A. 6. Vary LOAD2 from 10 A to 0 A. VOUT1 and VOUT2 should remain within regulation per Table 1. 6.
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Performance Data and Typical Characteristic Curves www.ti.com 7 Performance Data and Typical Characteristic Curves Figure 4 through Figure 18 present typical performance curves for the TPS40322EVM-679. 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. 7.1 Efficiency 95 VOUT = 1.
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Performance Data and Typical Characteristic Curves 7.2 www.ti.com Load Regulation VOUT1 VOLTAGE (V) VOUT1 LOAD REGULATION 1.215 1.21 1.205 1.2 1.195 0 2 4 6 8 10 VOUT1 LOAD (A) VOUT2 disabled VOUT2 = 0A VOUT2 = 10A Figure 6. TPS40322EVM-679 VOUT1 Load Regulation, (VIN = 12 V) VOUT1 VOLTAGE (V) VOUT2 LOAD REGULATION 1.81 1.805 1.8 1.795 1.79 0 2 4 6 8 10 VOUT1 LOAD (A) VOUT1 disabled VOUT1 = 0A VOUT1 = 10A Figure 7.
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Performance Data and Typical Characteristic Curves www.ti.com 7.3 Line Regulation VOUT1 VOLTAGE (V) VOUT1 LINE REGULATION 1.215 1.21 1.205 1.2 1.195 8 9 10 11 12 13 14 15 INPUT VOLTAGE (V) VOUT1 = VOUT2 =10A Figure 8. TPS40322EVM-679 VOUT1 Line Regulation VOUT1 VOLTAGE (V) VOUT2 LINE REGULATION 1.81 1.805 1.8 1.795 1.79 8 9 10 11 12 13 14 15 INPUT VOLTAGE (V) VOUT1 = VOUT2 = 10A Figure 9.
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Performance Data and Typical Characteristic Curves 100 225.0 80 180.0 60 135.0 40 90.0 20 45.0 0 0.0 −20 Phase (°) Bode Plot Gain (dB) 7.4 www.ti.com −45.0 −40 −90.0 Gain Phase −60 100 1000 10000 Frequency (Hz) 100000 −135.0 1000000 100 225.0 80 180.0 60 135.0 40 90.0 20 45.0 0 0.0 −20 Phase (°) Gain (dB) Figure 10. TPS40322EVM-679 VOUT1 Loop Response Gain and Phase, (VIN = 12 V IOUT1 = 10 A) −45.0 −40 −90.
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Performance Data and Typical Characteristic Curves www.ti.com 7.5 Output Ripple Figure 12. VOUT1 Output Ripple, (VIN = 12 V, IOUT1 = 10 A) Figure 13.
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Performance Data and Typical Characteristic Curves 7.6 www.ti.com Switching Waveforms Figure 14.
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www.ti.com 7.7 Performance Data and Typical Characteristic Curves Turn-On Waveform Figure 15. Enable Turn-On Waveform, (Sequencing VOUT1 then VOUT2, Ch1 = VOUT1, Ch2 = VOUT2, VIN = 12 V, IOUT1 = IOUT2 = 10 A) Figure 16.
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Performance Data and Typical Characteristic Curves 7.8 www.ti.com Turn-Off Waveform Figure 17. Enable Turn-Off waveform, Ch1 = VOUT1, Ch2 = HDRV1, VIN = 12 V, IOUT1 = 10 A 7.9 Master Mode Function Figure 18. PHSET Shorted to Master Mode (JP5 pin 2 to JP5 pin 3, Ch1 = SYNC 1.
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www.ti.com 8 EVM Assembly Drawings and PCB layout (TPS40322EVM-679) EVM Assembly Drawings and PCB layout (TPS40322EVM-679) Figure 19 through Figure 26 show the design of the TPS40322EVM-679 printed circuit board, HPA679. Figure 19. Top Layer Assembly Drawing (top view) Figure 20.
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EVM Assembly Drawings and PCB layout (TPS40322EVM-679) www.ti.com Figure 21. Top Copper (top view) Figure 22.
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www.ti.com EVM Assembly Drawings and PCB layout (TPS40322EVM-679) Figure 23. Internal Layer 1 (top view) Figure 24.
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EVM Assembly Drawings and PCB layout (TPS40322EVM-679) www.ti.com Figure 25. Top Silk (top view) Figure 26.
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List of Materials www.ti.com 9 List of Materials List of materials for the TPS40322EVM-679. Table 3. List of Materials COUNT 1 REF DES C1 DESCRIPTION Capacitor, aluminum, 100 µF, 35 V, ±20%, 0.328 x 0.328 inch PART NUMBER MFR EEV-FK1V101GP Panasonic - ECG C2, C7, Capacitor, ceramic, 0.1 µF, 50 V, X7R, ±10%, 0603 C20, C26, C39 Std Std 5 2 C3, C35 Capacitor, ceramic, 0.1 µF, 25 V, X5R, ±10%, 0402 Std Std 2 C4, C36 Capacitor, ceramic, 1.
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List of Materials www.ti.com Table 3. List of Materials (continued) COUNT 22 REF DES DESCRIPTION PART NUMBER MFR 1 R1 Resistor, chip, 68.1 kΩ, 1/10 W, ±1%, 0603 Std Std 2 R2, R21 Resistor, chip, 86.6 kΩ, 1/10 W, ±1%, 0603 Std Std 1 R3 Resistor, chip, 12.7 kΩ, 1/10 W, ±1%, 0603 Std Std 3 R4, R5, R22 Resistor, chip, 1.00 Ω, 1/10 W, ±1%, 0603 Std Std 1 R6 Resistor, chip, 40.2 kΩ, 1/10 W, ±1%, 0603 Std Std 2 R7, R24 Resistor, chip, 49.
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Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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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. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.