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LT8390 chokes while driving motors in Buck mode

Question asked by srinath99 on Jul 9, 2018
Latest reply on Jul 11, 2018 by srinath99

Hi

 

I developed a schematic for a synchronous buck converter based on  LT8390 reference design.

I am stepping down a voltage of approx 40V (From a LiPo battery) to 24Volts.

 

However if i increase motor RPM even in a moderate way, the motor stalls for lack of current and output voltage drops significantly.

 

If the motors are powered directly by a 40V or 24V battery, there is no problem at all. I can increase or decrease RPM as fast as humanly possible and the motors never stall.

What am i doing wrong ?

Attached is the schematic that i am using..

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