Controlling the SZBK07 DC-DC converter

Electronics
Written By Curious Scientist

In this video I prepare the SZBK07 circuit so it can be controlled via a digital potentiometer. I show you how to trace back some of the most important connections to the LM25116 buck converter controller. By using a small trick, we “inject” some current to the circuit at the CV potentiometer / FB pin. If we pick the resistor carefully, we can match the range of the MCP41100 digital potentiometer (0-5 V) and control the circuit digitally.

Schematics and connections

The arrangement of the potentiometer and the extra resistor used in the circuit.

The arrangement of the potentiometer and the extra resistor used in the circuit.

The back side of the SZBK07 PCB. The most important parts are marked on the picture.

The back side of the SZBK07 PCB. The most important parts are marked on the picture.

Curious Scientist https://curiousscientist.tech
Previous

Building a digital control circuit for the SZBK07 DC-DC buck converter
Next

Let’s discuss different stepper motor drivers