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thanks for the reply, after a few test. i found that when the inductor produce sound the output voltage will not increase..the output voltage become the same with the input voltage
Added after 4 minutes:
one more thing..how do i check the frequency? is it across the inductor?
Yes check the Frequency across the inductor. Also, share this with the chip manufacturer; they may have some helpful advice such as placing components closer to converter chip. Also some power and ground planes may be helpful in the efficiency of the design.
oh, i thought you may have been using a dc/dc converter chip to produce the pwm. in any case check the frequency across the inductor and I think you'll find that it is in the audible range.
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, let say, if the frequency across the inductor is in audible range, how can i solve it?