ajanogi
Newbie level 4
Hello Everybody.
I need a transformerless power supply. 220V AC 50Hz to 12, 15 or 20V DC. I found a circuit and just saw this converter LNK306GN. I get the chip and try the circuit but i cant get the DC voltage. You can see my schematics that i've attached.
Firstly, i tried not to use zener. In application note (AN37) it says for buck converter, 11.86k and 680uH gives 12V 430mA out. But i couldn't found that product. So i used 13k adn 680uH and see 25V output.
And when i tried to use zener or voltage dropper i cant get any voltage. Just zero.
So i really need to use this product for transformerless power supply Please help me. By the way i used 1n4005gp but after it s blow i changed it 1n4007.
I need a transformerless power supply. 220V AC 50Hz to 12, 15 or 20V DC. I found a circuit and just saw this converter LNK306GN. I get the chip and try the circuit but i cant get the DC voltage. You can see my schematics that i've attached.
Firstly, i tried not to use zener. In application note (AN37) it says for buck converter, 11.86k and 680uH gives 12V 430mA out. But i couldn't found that product. So i used 13k adn 680uH and see 25V output.
And when i tried to use zener or voltage dropper i cant get any voltage. Just zero.
So i really need to use this product for transformerless power supply Please help me. By the way i used 1n4005gp but after it s blow i changed it 1n4007.