Hi I have a design with the STUSB4500 per the attached schematic snippet and programmed per the attached memory map. This circuit is on a tiny board inside the plug end of a captured USB cable. The PDO's are programmed to default to 20V @ 3A.
The application is for a one-time use product (used for about 1 hour) and normally this works well. However about 1% of the time the cable assembly appears to perform the following:
1) properly negotiate 20V@3A (as seen on a cc line sniffer)
2) shortly after 20V is applied by the DFP, enough current is drawn to bring down the power supply.
3) power supply remains off until the cable is unplugged, then the cycle starts over when re-plugged in.
We can continue un-plugging, then plugging-in the cord (nothing else attached to the other end of the cable). Sometimes we can do this twice, and other times 50 cycles until it just starts working. Once it decides to work, it works without fail forever. Is there something wrong with the circuit design that can be causing this intermittent failure?
