Vout = 500mV/div

100us/div

SW = 10V/div

IL = 5A/div

Figure 8-20. TPS563257 Normal Operation to

Output Hard Short

Vout = 1V/div

10ms/div

SW = 10V/div

IL = 5A/div

Figure 8-21. Output Hard Short Hiccup

8.3 Power Supply Recommendations

The TPS56325x are designed to operate from input supply voltages in the range of 3 V to 17 V. Buck converters

require the input voltage to be higher than the output voltage for proper operation.

8.4 Layout

8.4.1 Layout Guidelines

• Keep VIN and GND traces as wide as possible to reduce trace impedance. The wide areas are also an

advantage from the view point of heat dissipation.

• Place the input capacitor and output capacitor as close to the device as possible to minimize trace

impedance.

• Provide sufficient vias for the input capacitor and output capacitor.

• Keep the SW trace as physically short and wide as practical to minimize radiated emissions.

• Do not allow switching current to flow under the device.

• Connect a separate VOUT path to the upper feedback resistor.

• Make a Kelvin connection to the GND pin for the feedback path.

• Place a voltage feedback loop away from the high-voltage switching trace, and preferably has ground shield.

• Make the trace of the FB node as small as possible to avoid noise coupling.

• Make the GND trace between the output capacitor and the GND pin as wide as possible to minimize its trace

impedance.

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TPS563252, TPS563257

SLUSEQ5A – AUGUST 2022 – REVISED MAY 2023

Copyright © 2023 Texas Instruments Incorporated

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Product Folder Links: TPS563252 TPS563257