L293D based Switching Circuit

Thread Starter

shreykothavade

Joined Apr 1, 2021
5
IMG_20210401_111423.jpg

I am trying to build a switching circuit based on the L293D motor driver, but the current is limiting at 100uA not allowing LED to glow. I tried connecting grounding of LED to 2Y pin still same response, I am puzzled why L293D is not allowing the current to flow!!! need help with this :)
 

wayneh

Joined Sep 9, 2010
17,152
I agree the pinout is OK despite naming in a different order than the datasheet.

A photo of your build might help. Probably something silly is wrong. A bypass capacitor on the IC power would be a good idea. And how clean is the output of that buck converter? You might try another 5V source.
 

Thread Starter

shreykothavade

Joined Apr 1, 2021
5
I got the solution, the load of LED is very less to draw current from L293D IC. When I connected my circuit with a heavy load bulb, it started working fine. so basically, L293D can drive heavy loads but doesn't operate at low loads. Thanks, everyone for replying.
 
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