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TPS5420EVM-175 SWIFT™ Regulator Evaluation Module
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Introduction
This user's guide contains background information for the TPS5420 as well as support documentation for
the TPS5420EVM-175 evaluation module (HPA175). Also included are the performance specifications, the
schematic, and the bill of materials for the TPS5420EVM-175.
1.1
Background
The TPS5420 dc/dc converter is designed to provide up to a 2-A continuous, 3-A peak output from an
input voltage source of 5.5 V to 36 V. Rated input voltage and output current range for the evaluation
module is given in
printed-circuit-board areas that may be achieved when designing with the TPS5420 regulator and does
not reflect the high input voltages that may be used when designing with this part. The switching
frequency is internally set at a nominal 500 kHz. The high-side MOSFET is incorporated inside the
SWIFT, PowerPAD are trademarks of Texas Instruments.
SLVU163 - April 2006
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Table
1. This evaluation module is designed to demonstrate the small
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TPS5420EVM-175 SWIFT™ Regulator Evaluation Module
User's Guide
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Summary of Contents for Texas Instruments TPS5420EVM-175 SWIFT
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Page 1: Table Of Contents
The switching frequency is internally set at a nominal 500 kHz. The high-side MOSFET is incorporated inside the SWIFT, PowerPAD are trademarks of Texas Instruments. SLVU163 – April 2006 TPS5420EVM-175 SWIFT™... -
Page 2: Input Voltage And Output Current Summary
200 ns, and the maximum duty cycle is less than 87%. The values given in Table 3 are standard values, not the exact value calculated using Equation TPS5420EVM-175 SWIFT™ Regulator Evaluation Module SLVU163 – April 2006 Submit Documentation Feedback... -
Page 3: Test Setup And Results
25°C. The efficiency is lower at higher ambient temperatures, due to temperature variation in the drain-to-source resistance of the MOSFETs. SLVU163 – April 2006 TPS5420EVM-175 SWIFT™ Regulator Evaluation Module Submit Documentation Feedback... -
Page 4: Measured Efficiency, Tps5420
3. Measurements are given for an ambient temperature of 25°C. LOAD REGULATION OUTPUT CURRENT 0.30 0.20 0.10 -0.10 -0.20 -0.30 I - Output Current - A Figure 2. Load Regulation TPS5420EVM-175 SWIFT™ Regulator Evaluation Module SLVU163 – April 2006 Submit Documentation Feedback... -
Page 5: Line Regulation
75% of maximum rated load. Total peak-to-peak voltage variation is as shown, including ripple and noise on the output. = 50 mV/Div (AC Coupled) = 500 m A/Div t - Time = 200 s/Div Figure 4. Load Transient Response, TPS5420 SLVU163 – April 2006 TPS5420EVM-175 SWIFT™ Regulator Evaluation Module Submit Documentation Feedback... -
Page 6: Measured Loop Response, Tps5420, Vin = 25 V
TPS5420. Output current is the rated full load of 2 A. Voltage is measured directly across output capacitors. V = 10 mV/div (ac Coupled) PH = 10 mV/div Time = 1 s/div Figure 6. Measured Output Voltage Ripple, TPS5420 TPS5420EVM-175 SWIFT™ Regulator Evaluation Module SLVU163 – April 2006 Submit Documentation Feedback... -
Page 7: Input Voltage Ripple, Tps5420
ENA voltage reaches the enable-threshold voltage of 1.06 V, the start-up sequence begins as described above. V = 10 V/Div = 2 V/Div t - Time = 5 ms/Div Figure 8. Power Up, VOUT Relative to VIN SLVU163 – April 2006 TPS5420EVM-175 SWIFT™ Regulator Evaluation Module Submit Documentation Feedback... -
Page 8: Board Layout
IC as possible. In addition, the voltage set-point resistor divider components are also kept close to the IC. The voltage divider network ties to the output voltage at the point of regulation, adjacent to the output capacitor C3. TPS5420EVM-175 SWIFT™ Regulator Evaluation Module SLVU163 – April 2006 Submit Documentation Feedback... -
Page 9: Top-Side Layout
Board Layout Figure 10. Top-Side Layout SLVU163 – April 2006 TPS5420EVM-175 SWIFT™ Regulator Evaluation Module Submit Documentation Feedback... -
Page 10: Bottom-Side Layout (Looking From Top Side)
Board Layout Figure 11. Bottom-Side Layout (Looking From Top Side) TPS5420EVM-175 SWIFT™ Regulator Evaluation Module SLVU163 – April 2006 Submit Documentation Feedback... -
Page 11: Schematic And Bill Of Materials
Schematic and Bill of Materials Figure 12. Top-Side Assembly Schematic and Bill of Materials The TPS5420EVM-175 schematic and bill of materials are presented in this section. SLVU163 – April 2006 TPS5420EVM-175 SWIFT™ Regulator Evaluation Module Submit Documentation Feedback... -
Page 12: Tps5420Evm-175 Schematic
Schematic and Bill of Materials Schematic The schematic for the TPS5420EVM-175 is shown in Figure Figure 13. TPS5420EVM-175 Schematic TPS5420EVM-175 SWIFT™ Regulator Evaluation Module SLVU163 – April 2006 Submit Documentation Feedback... -
Page 13: Tps5420Evm-175 Bill Of Materials
0.100 x 0.100 5001 Keystone IC, Switching Step-Down Regulator, 36V, 2A TPS5420D – PCB, 1.95 In x 1.95 In x 0.062 In HPA175 – Shunt, 100-mil, Black 0.100 929950-00 SLVU163 – April 2006 TPS5420EVM-175 SWIFT™ Regulator Evaluation Module Submit Documentation Feedback... - Page 14 EVM TERMS AND CONDITIONS Texas Instruments (TI) provides the enclosed Evaluation Module and related material (EVM) to you, the user, (you or user) SUBJECT TO the terms and conditions set forth below. By accepting and using the EVM, you are indicating that you have read, understand and agree to be bound by these terms and conditions.
- Page 15 EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2006, Texas Instruments Incorporated...
- Page 16 TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions:...
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