User’s Guide Using the TPS51020 HighPerformance Synchronous Buck User’s Guide
EVM IMPORTANT NOTICE (CATEGORY B) IMPORTANT: TI is providing the enclosed HPA064 evaluation module under the following conditions: This evaluation module (EVM) being provided by Texas Instruments (TI) is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by Texas Instruments to be fit for commercial use.
DYNAMIC WARNINGS AND RESTRICTIONS It is important to operate this EVM within the maximum input voltage ranges specified in Table 4. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
SLUU194 − May 2004 Using the TPS51020 High-Performance Buck Controller Evaluation Module Portable Power Products CONTENTS 1 Descripiton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Electrical Perfomance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SLUU194 − May 2004 2 Electrical Performance Specifications A summary of performance specifications for TPS51020EVM−001 is provided in Table 1. 2.1 Performance Specification Summary Table 1.
+ + + + + SLUU194 − May 2004 Figure 1.
SLUU194 − May 2004 4 Test Setup and Results 4.1 Test Setup The HPA064 has the following input/output connections: 12-V input through J3 (VIN and GND), 5.0-V output through J1 (VO1 and GND), 3.3-V output through J2 (VO2 and GND). A diagram showing the connection points is shown in Figure 2. A power supply capable of supplying 6 A should be connected to VIN and GND through a pair of 16 AWG wires. The 5.0-V and 3.
SLUU194 − May 2004 4.2 Power-Up and Power-Down Figures 3 and 4 show the power-up and power-down waveforms. The powergood (PGOOD) pin jumps to high after both outputs have started and have been in regulation for 2048 clock pulses (6.8 ms). VIN 10 V/div VIN 10 V/div VO2 5 V/div VO2 5 V/div VO1 5 V/div VO1 5 V/div PGOOD 5 V/div PGOOD 5 V/div t − Time − 5 ms/div Figure 3. Power-Up Waveform 8 Using the TPS51020 t − Time − 500 µs/div Figure 4.
SLUU194 − May 2004 4.3 Efficiency and Power Loss Figures 5 and 6 show the test efficiency and power losses vs. load current at different conditions. The maximum efficiency is approximately 94.8% when both channels are enabled. The total power loss is 3.5 W when both channels are on and deliverying 6.0 A. EFFICIENCY vs LOAD CURRENT POWER LOSS vs LOAD CURRENT 100 3.5 98 Channel 1 Enabled Only Channel 1 Enabled Only 3.
SLUU194 − May 2004 4.5 Load Transient Figures 8 and 9 show the load transient waveforms for each channel. When load is stepped from 0 A to 5 A, the undershoot voltage is less than 60 mV and the settling time is less than 30 µs. When load is stepped down from 5 A to 0 A, the overshoot voltage is less than 50 mV and the settling time is less than 50 µs. VO2 50 mV/div VO2 50 mV/div IOUT1 (2 A/div) IOUT1 (2 A/div) t − Time − 25 µs/div t − Time − 50 µs/div Figure 9.
SLUU194 − May 2004 5 TPS51020EVM−001 Assembly Drawing and PCB Layout Figures 12 through 16 show the assembly drawing and each layer. Figure 12. Top Assembly Figure 13.
SLUU194 − May 2004 Figure 14. Inner Layer 1 Figure 15.
SLUU194 − May 2004 Figure 16.
SLUU194 − May 2004 6 TPS51020EVM−001 Circuit Module List of Materials List of materials required for the TPS51020EVM−001. Table 2. List of Materials RERERENCE DESIGNATOR C1, C4, C12, C13, C16, C17 14 QTY DESCRIPTION SIZE MFR PART NUMBER 6 Capacitor, ceramic, 2.
SLUU194 − May 2004 7 References 1.
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