My customer found a logic problem(SN74AHCT1G04DBVR) on existing products of motor driver.
Application: servo Motor
Sub-System: Inverter Logic for IGBT Braking application.
Problem: When inverter logic is fail, the IGBT will be always turn-on and braking resistor is continuously having power dissipation and heating. As a result, it could cause something damage on the power board.
After inverter logic was damaged, either VCC is shorted to OUTPUT or GND is shorted to OUTPUT
Failure rate: TBD, it’s low now.
Question: Besides the either VCC or GND is shorted to OUTPUT pin with existing defective devices, what else? Is it possilbe that the device is in high impedance or OPEN status after device is damaged? Please advice. thanks.