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Electronics => Repair => Topic started by: peteb2 on July 08, 2021, 12:03:03 am

Title: Does anyone recognise this buck converter module please?
Post by: peteb2 on July 08, 2021, 12:03:03 am

It sports the Texas Synchronous Buck Controller type 40057... There are two versions that look identical, 12V input for either 3.8V or 12V in for 2.8V  and the yellow coloured automotive style fuse F1 in the picture is rated 20A. 110mm x 36mm. They are mass produced in China going by the silk & no-brand electrolytics. Any info really appreciated.... thanks. :)

Title: Re: Does anyone recognise this buck converter module please?
Post by: thm_w on July 08, 2021, 12:36:41 am

Any specific info that cant be determined by:
- the datasheet (https://www.ti.com/lit/ds/symlink/tps40057.pdf)
- voltage rating of the capacitors
- current rating of the FETs (assuming they aren't lasered)
?

I wouldn't trust the spec given on any website, and go based off the parts you see on the board.

Title: Re: Does anyone recognise this buck converter module please?
Post by: peteb2 on July 08, 2021, 01:00:41 am

I've just given the MOSFETS a good drink of acetone to remove the 'tropicalising'. My googling doesn't reveal anything for GV5H1D & i sure do not recognize the maker's logo. The "JSH" axial electros are 35V 125 degree at the input while the three at the output end they are 6.3V same maker. The board runs fairly screaming hot with same-sized alloy plate attached that's then clamped to a more substantial one.

Title: Re: Does anyone recognise this buck converter module please?
Post by: peteb2 on July 08, 2021, 01:20:07 am

.... Oops & here is a classic example of not going far enough!!! I finally, just now, did a truly full teardown on the module & wadda yuh know.... you uncover this label buried from view on that other side of the backing plate to the heatsink! DOLT!  :-DD :palm: :palm:

Thanks for the input so far ...

Title: Re: Does anyone recognise this buck converter module please?
Post by: mon2 on July 08, 2021, 01:56:50 am

1) MFR

http://www.rong-electric.net/ (http://www.rong-electric.net/)

2) AOSMD mosfets p/n 6512 - datasheet is attached

3) TI regulator p/n TPS40057 - datasheet is attached