Monthly Archives: November 2023

AL8843 led driver board

Posted on by

This is a quick build around an AL8843 step-down led driver from Diodes inc

It uses the reverse buck topology, where the switching mosfet is referenced to ground, and the output is referenced to Vcc. This works well for loads that don’t need a ground connection – LED’s for example.

It also simplifies the chip internals because there’s no need for a floating gate driver and a charge pump to power it.

Continue reading

Category: Electronica | Tags:

3s-5s BMS based on BQ77904 and BQ77905

Lately I’ve been building some custom battery packs and I’ve been unlucky with the cheap BMS boards.

That’s why I’ve decided to build my own – something that could work stand alone and provide basic protection.

For that I chose the BQ77904 and BQ77905 from TI.

They have all the functionality that I need and they can be chained to create up to 20S packs.

Continue reading

Category: Electronica | Tags: , , ,