Hello.
I have recently debuging your UCD3138 full bridge hard switch circuit development board.
I have encountered a question .
The development board has a secondary short circuit during circuit debuging. Resulting in the primary MOS tube and secondary synchronous rectifier and the primary MOS transistor driver UCD27211 burned out.I replaced the MOS tubes and drive UCD27211, auxiliary power can work properly. But UCD3138stay in the IDLE state, did not enter the Single Frame state, the system can not start, UCD3138 did not issue PWM, power input current is only 19mA.
I guess should be my hardware part of the problem, leading to UCD3138 stay in IDLE state. But I checked the auxiliary current, the driver, the isolator, the MOS tube, the input voltage sampling circuit, these are all good. I am now very puzzled.
Excuse me, can i get the inspiration from the program? Can be seen from the program may be what causes UCD3138 unable to enter the Single Frame state, and stay in the IDLE state?
Thank you!