PLfy3h

A step-down module based on TPS5450 to convert 10V~31V to 5V.

Overview

The TPS5450 is a high-output-current PWM converter integrating a low-resistance, high-side N-channel MOSFET. The board, featuring the listed characteristics, also includes a high-performance voltage error amplifier (providing high regulation accuracy under transient conditions), an undervoltage lockout circuit (to prevent startup before the input voltage reaches 5.5V), an internally integrated slow-start circuit (to limit inrush current), and a voltage feedforward circuit (to improve transient response).
The input voltage range is 10V to 31V,
and the output voltage is 5V.

Using the calculated formula, R1=15.8K and R2=5.1K, the output voltage is made equal to 5V.
Output accuracy: No-load output 5.00%,
Full-load output 4.99%. The
output accuracy meets design requirements
. High-frequency electrolytic capacitors and TVS converters help improve dynamic response.
This buck module's ripple under load is basically within requirements, not exceeding 60mV.
The conversion efficiency fluctuates around 85% at various output currents.

Design Files

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Update:2026-03-28 19:42:23

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