LNK306 Inductor noise
Hello, I have designed using LNK306 in my circuit. When the circuit is powered on, there is audible noise coming from the output inductor.
Then I bought the LNK304 reference board (RDR-138) to check if there is any noise coming out from the inductor. And yes, there is noise coming out from inductor, the noise will become louder when load is connected.
Is there any way to remove/reduce the output inductor noise?
Comments
Hi, i have read both threads, and i understand beside inductor, ceramic capacitor also contribute to noise. But the LNK304 reference board (RDR-138) that we bought also have the noise, and is using elecrolytic capacitor.
Try raising the inductor up off the PCB and see if that helps reduce the noise.
-Wesley
I put a post yesterday. I have the same problem. We are using LNK306 for a flyback power supply. There is 2000uF elecrolytic capacitor in the secondary. The transformer is customized. If I raise the transformer up off the PCB, the noise will be reduced significiantly.
Please point me how to fix this problem?
Regards
Samuel
Hi, raising the inductor up, does helps to reduce the noise.
But the noise is still audible. Can it be reduce further?
Hi please see this following thread: http://www.powerint.com/forum/ask-pi-engineer/rdk-131-load-vs-no-load-audible-noise
There are many good points brought up to be aware of. Firstly make sure that the inductor is the true source of the noise. Often times the output capacitor may be the source of the problem and changing to an electrolytic or tantalum type will help solve the problem.
This thread also is similar to the type of problem you are having: http://www.powerint.com/en/forum/ask-pi-engineer/lnk304-audible-noise
If you could post a schematic and BOM it would be helpful as well.
-Wesley