dii2Hu

The DJI AIR2S charging module is based on JW3651.

Overview

The design has some issues, so replication is not recommended! This is primarily a place to share the design and debugging process and for discussion.
Design goal:
To create a USB fast charger for the AIR2S. DJI batteries already include protection boards and handle charging management, so only a 13.2V 3A DC output power supply is needed.
The JW3651 can support 5-20V input and is a BUCK-BOOST structure, capable of handling different input voltages.
However, in practice, it seems the JW3651 is best suited for powering power banks, typically operating at 4S (17V or less).
The chip's maximum withstand voltage is listed as 24V in the datasheet; using 20V as the operating voltage makes protection design difficult. (I haven't figured out how to use TVS protection...

but in practice, I've encountered reverse connections of 28V and 20V once, and the chip survived.)

Design Files

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Update:2026-03-27 22:17:33

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