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The solution of the Audible noise for LM3492HC

Atsushi Yamauchi
Genius 4810 points
Other Parts Discussed in Thread: LM3492HC

I would like to confirm the solution od the Audible noise for LM3492HC.

In the datasheet page1, there is the comment of the audible noise "The application circuit is stable with ceramic cpacitor - produces no audible noise on dimming."

For this comment, I have questions.

1. How does LM3492HC avoid the audible noise in the IC? If possible, could you explain it?

2. Are there any conditions for avoiding the noise? In application infomation of this datasheet, it is used each 2 capacitors of Cin and Cout.

The audible noise appeared the board with LM3492HC of the customer application. They use 10 capacitors for Cout.

Best regards,

Atsushi Yamauchi