PTD08A020W High Temperature Fault

Kyle Whaley

Other Parts Discussed in Thread: PTD08D210W, PTD08A020W, UCD9248

I have a new design with several PTD08A020W and PTD08D210W modules controlled by a UCD9248 controller. One of the PTD08A020W modules has a high temperature fault with a temperature reading of 112 as reported through the TI Fusion Digital Power Designer software. The module next to it has a temperature reading of 30. There is a series sense resistor on the output of each module and I have removed those resistors while I debug these circuits. So there is no load or current output from the failing device. With the resistors removed I still see a high temp fault. I have tried clearing the fault and logged fault but the fault still persists. We have used a thermal I have seen this on two different boards same module on both boards. Analysis with a thermal camera yielding no hot spots on either board.

Have you seen this type of fault before? Can you recommend a course of action?

Regards,

Kyle

over 10 years ago

0 Tom Guerin over 10 years ago

TI__Mastermind 38230 points

This request on UCD9248 and PTD08A020W current question is forwarded to the digital support group on UCD9248.

Tom

0 Kyle Whaley over 10 years ago in reply to Tom Guerin

Prodigy 50 points

Thanks.

0 Kyle Whaley over 10 years ago in reply to Kyle Whaley

Prodigy 50 points

I ran the temperature calibration on the high temp rail. The calibration initially failed as the GUI reported temp (112) was not within 25% of the measured temp (30). Had to "lie" to the controller and run the temperature calibrate routine multiple times bumping down the "actual" temperature a few degrees at a time (100...90...80...70...etc) until I got within 25% of the actual temp. Since then that rail has been measuring accurately.

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PTD08A020W High Temperature Fault