Motor Driver IC Blown up. Wish to know what went wrong
I am using 11.1V 25C 3700mAh Lipo Battery for powering up Motor driver Card (Dual DC Motor Driver 20A) Motor driver Product Link: http://robokits.co.in/motor-drives/dual-dc-motor-driver-20a .
Basically, I tried connecting two motors instead of single Motor on each motor port on the driver. So in all 4 DC motors connected as the motors had no load. As per my calculations, all 4 DC motors together cannot draw more than 4 Amps of current. DC Motor Specifications 10 RPM High Torque Dc Motor.
Link : http://robokits.co.in/motors/high-torque-dc-geared-motor-10rpm?cPath=2_3&
During this check I noticed that one of the IC LR 7843 on the motor Driver Card got burnt, the moment I powered it up with LiPo Battery.
Really don't Know why this happened.... Can someone please help me....
Discussions
3 years ago
The motors probably drew a lot of current on start
3 years ago
I can think of 4 reasons.
Defective in the first place.
Over current on startup.
If it is a full bridge:
Wired wrong so it drove past the motor to ground.
Programmed wrong so it drove past the motor to ground.
If you look at circuit A in this Instructable:
If you close transistors QC and QD or transistors QB and QE the current bypasses the motor making a dead short to ground blowing the component.
3 years ago
For one thing, the startup current can be very high.
How did you wire the motors ? In series, or parallel ?
Reply 3 years ago
Thanks for the reply.
I had connected two motors in Parallel.
Reply 3 years ago
Which doubles the inrush current