Part Number: TPS40422
I have a TPS40422+CSD87350 two phase design, the target loading is 60A. Attached is the schematic.
when power up with 40A loading, the board works fine, but failed to work with 60A loading.
I tried a lot check with component, soldering issue, but no improve. then I found after I heat the board to a level like above 40 degree Celsius. the board works.
So, what is the root cause for the board fail? and why the pre-heat can make it work? is there any issue with my schematic design?Power Sch.pdf
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In reply to Qian Chen:
I found the TI Fusion SW tool, How can I connect the board to this tool? Is there any debugger to use?
In reply to user3204916:
The USB I/O adapter is available at TI store.
Yeah, I got the adaptor, and there is OC fault.
But actually, we have mass production last month, and there is no issue with the default setting (we already have 1000 pcs board shipped with default setting). I checked the component, found that the failed board installed TPS40422 with data 2016 Oct. and the good board is new chip in 2018.
So seems that the part is too old, right? now we have 500 failed board, and I want to repair the board with minimum effort, do you have any suggetion?
"For temporary solution, you can add a resistor in parallel with C563 and C565 to attenuate current sense signal, hence to solve OC problem." What is resistor value to aprallel with C563?
Can you let me know the inductance and DCR value? What's the OC threshold you expect?
If changing R623 and R624 value is not enough, are you able to program the controller on those 500 failed boards?
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