Problem with TDA4601 power supply controller

F

Thread Starter

Faisal

I am repairing one inverter. The power section consist of switching power supply controller TDA 4601. The problem is that at pin 2 the zero crossing detection the capacitor of 22pF is connceted b/w pin 2 and pin 3. The power supply is only starting when i touch any metallic thing at pin 2 for a moment and then removed, it continues to work, otherwise not. I have already change differnet value of capacitors but the problem is still there. The Switching transistor is BUV 48A. If any one can help me, i will be very thankful of him.

Thanks.
 
M

mansoor hayat khan

your problem may be leakage of pcb ? cheack the voltage may be unbalance. some times error of voltage may be ground when you touch the pin no 2.
 
Your problem may be leakage of pcb ? cheack the voltage may be unbalance. some times error of voltage may be ground when you touch the pin no 2.
 
R
yes same problem i had encountered i already replaced tda4601 but same problem is occurred... still there is no power output. is there another possibilities why this happened? what possible component is defective? thanks
 
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