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LNK306 Sound for circuit

Posted by: martijndeboer on
Hello, For my design comes a awfull sound at approx. 10 kHz. Can somebody give me some advice to solve this? Best regards, Martijn

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Submitted by John Carpenter on 11/20/2008
In most cases, the noise is caused by the output inductor. Use a oscilloscope with a current probe and verify that the inductor is not saturating. Also verify that for a given load, that the switching frequency is stable. Use the recommended inductors. Z. Cochrane