MC33926 - 5amps H-bridge

Document created by Joshevelle Employee on May 12, 2015Last modified by Joshevelle Employee on May 25, 2015
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Hello All,


I would like to share a bare board I designed to test one of our H-bridges.


The design is based in the MC33926 which is a DC motor driver, capable of handling up to 5A and 5 to 28v. The microcontroller I used to drive the H-bridge was the S08PA16 an 8-Bit, 5v microcontroller with Robust GPIO and high drive capability. Since I wanted to use this board for another projects, I leave access to 6 GPIO and 2 ADC-CH.


The schematic and board design are compatible with CADSOFT EAGLE. I modified the Element14 library to add the uC and the H-bridge.


I sent the gerber files to OSH Park, and hand solder everything to the board using solder paste. The uC was programmed with a Multilink BDM.



MC33926 Bare board






Mounted devices



The DC motor I was using did not require more than 3amps. However, the MC33926 is designed to handle up to 5amps and since I will use this board for any other project involving a DC motor, I designed a custom aluminum heatsink and manufacture it with a milling machine. The holes in the heatsink are centered with the VCC and DC-Motor connector screws, hence neither the connector screws or the header pins are in contact with the heatsink.



2014-11-22 14.14.46.jpg


I used thermal grease to properly mount the device on its heatsink.

2014-11-22 14.22.43.jpg



Final board:

2014-11-22 14.26.51.jpg


I hope this information helps anyone who would like to use our H-bridges. Please do not hesitate to contact me if you have any question.