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UCC5390: Controlled power to a Motor drive Circuit - issues

Part Number: UCC5390


I have been working on the above circuit design. It is an application of motor driving based on MOSFETs (STW70N60M2 ) and Gate drivers (UCC5390SCDR). Motor power is fed to the drive circuit (M3 and M4) through an another MOSFET based drive circuit (G1, M1 and G2, M2) called as vital power control circuit. This is a one point power control for many motor drive circuits to be interfaced. 

Initially, I have set all MOSFET gate drivers power supply as 15 V. While driving the Motor I have observed that M1 and M2 tend to heat up whereas M3 and M4 are normal. Later I have changed it to 18V, but observed the same heating issue.

Does the circuit work for my application? Need suggestions.



  • Hi, Lingamurthy,

    Can you post your schematic? I can’t make much out of your block diagram. 

    Do you have any oscilloscope shots you’ve saved during your debug process?

    Key point is to make sure the Mosfets are receiving the proper gate to source voltage to fully turn on, and, also check there is no high frequency oscillations going on. That can cause self-heating of power Mosfets.  

    Best regards,