Texas Instruments TPS548A28, User Manual

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Introduction
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2 SLVUBO0A – March 2020 – Revised May 2020
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Copyright © 2020, Texas Instruments Incorporated
Using the TPS54JA20EVM-023 12-A, Buck Converter Evaluation Module
19 TPS54JA20EVM Bottom-Side Layout
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List of Tables
1 Input Voltage and Output Current Summary
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2 TPS54JA20EVM Performance Specification Summary
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3 TPS54JA20EVM Mode Pin Selection
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4 Enable Pin Selection
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5 TPS54JA20EVM EVM Connectors and Test Points
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6 TPS54JA20EVM List of Materials
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Trademarks
D-CAP3 is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
1 Introduction
The TPS54JA20 is a D-CAP3™ synchronous buck converter designed for 12 A output current, and the
evaluation module is designed to demonstrate the small printed-circuit-board areas that may be achieved
when designing with the device. The high-side and low-side switching MOSFETs are integrated in the
device package along with their gate drive circuitry. Rated input voltage and output current ranges for the
evaluation module are given in
Table 1 .
1.1 Background
The EVM is setup to allow the user to evaluate the performance of the TPS54JA20 IC, and easily make
changes to multiple settings. The low drain-to-source on resistance of the MOSFETs allows the device to
achieve high efficiencies and keep the junction temperature low at high output currents. There is no need
for external compensation components since this device is designed with D-CAP3™ control topology. On
the EVM the switching frequency and the operation mode are externally selectable using a jumper to set
the resistor from the MODE pin to AGND. An external resistor divider allows for an adjustable output
voltage. Additionally, the device provides adjustable soft start, adjustable OC limit threshold, external
reference input, and an open-drain power good indicator. Lastly the TPS54JA20 device has a fixed
internal VIN under voltage lockout and externally adjustable UVLO using a resistor divider at the EN pin.
Table 1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE
OUTPUT CURRENT
RANGE
TPS54JA20 V
IN
= 4 V to 16 V 0 A to 12 A
Figure 1. Safety Warnings