LNK306 5V 300mA power supply
Hello
I tried to use PI-Expert to obtain an output of 5V and 300mA. I constructed the schematic. At my first trial, I get nearly 4.9V. it was OK. However; I got 4.4V when I draw 150mA from the output. To resolve this, I increase the RFB resistor by 200 ohms. Then, I got 5.4V at the output when there is no load. When I tried to draw current about 150mA, output voltage decreases to 4.8V .
Also, there is some heat on the inductor and LNK306 when I draw current higher than 200mA. I mean by some heat is that enable IC to work however it is much.
-How can I resolve the problem of output voltage which I increase to obtain 5V when there is a load ?
-How can I resolve the heat problem when drawing current higher than 200mA ?
Sincerely
Engin
๋๊ธ
Hello
Thank you for the reply.
I used PI-Expert software and it gave 470uH for the recommended iductor value. Or am I doing something wron ?
Also, how can I recognize that the inductor is saturated ?
Looking forward to hearing from you
sincerely
The recommended inductor value for 5V/280mA or 5V/300mA is 680uH. the value seen in schematic is 470uH. check whether inductor is getting saturated or not.