need urgent help - pwm program with 8051

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megha a s

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hi... i want do pwm program with 8051.. program is finrly working.. but m using sl100 darlington pair to drive the motor,but the transisters are buring out after few minutes,even i checked the current ratung, its more than sufficient... plz help me out... very soon plz.....
 

Re: need urgent help....

Hi
Did you use freewheel diode?
It is necessary to protect transistor when it drives inductive load.
 


Test your circuit with a smaller resistive load or a bulb ..
Once you’re satisfied THEN you can try your real load ..

:wink:
IanP
 

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