Hi Guys
could you help review our schematic below? A1-A8 are digital signal from MCU. These are PWM signal. The Y1-Y8 are PWM output to IPM driver signal. three pahse full bridge IPM.
During the test, we found that when the high-voltage DC bus is frequently powered on and off, one of SN74 devices shows that Y4 (15pin) can only output 4V PWM waves, the others are normal 5V; Please help us analyze the cause of this failure. I doubt these device is damaged by the couple high voltage signal. Could you review this schematic firstly?
Thanks
-Pengfei