[Electrical Engineering Competition Module] TPS5450 Step-Down Module

Chip Description: TPS5450 The
TPS5450 is a high-output-current PWM converter; it integrates a low-resistance high-side N-channel MOSFET.
It features undervoltage lockout, slow start, and voltage pre-feedback circuitry; when EN is off, the current can be reduced to 18uA.
Electrical Characteristics:

Input voltage range 5.5V~36V;
Up to 5A continuous output current;
Output voltage 1.22V~30V;

Circuit Description:

A 5.082P terminal block is used as the main input and output interface of the module, and a 2.543P header interface is added for extended power input and output for ease of use;
According to the capacitor distribution in the datasheet, two 4.7uF capacitors and one 10nF capacitor are used for filtering at the input; a 300uF capacitor and a 100nF capacitor are used for filtering at the output; The
output voltage is adjusted by adjusting the voltage divider values ​​of R1 and R2;

Precautions:

As described in the datasheet, this chip has a maximum output current of 5A, making it a high-current output DC-DC chip. When designing the PCB, if a current exceeding 3A is required, it is recommended to perform a solder mask opening and tin plating on the copper trace. In this example, no opening and tin plating were performed for aesthetic reasons;
When selecting voltage divider resistors, it is not recommended that the accuracy be lower than 1%, and the feedback line needs special consideration;
PCB layout should ideally follow the datasheet, with inputs, outputs, and chip GND all on a single copper trace. In this example, there are no other components, and the bottom copper trace is intact; therefore, some layout choices were omitted for aesthetic reasons.
Capacitor voltage ratings must be correctly selected; otherwise, they may burn out under high voltage input. Note

in the measured image
that 5V output at 1A is already 5W; therefore, you should connect multiple ordinary resistors or cement resistors in parallel to prevent them from burning out.