-Wed, 11/04/2009

L’8 novembre
Ovunque tu sia, prova a prenderci.
Se ci riesci.

Remember, remember the 8th of November...
Remember the 8th of November.
Catch the Fox, if you can!
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You are not hearing the

Mon, 05/31/2010 - 09:18

You are not hearing the 150kHz directly, you are hearing effects of the PWM tracking for controlling the output voltage. You say you are 70-653 using a shielded inductor with potting, so that's probably where the noise is coming from -- 70-654 the interface between the two parts (inductor and shield).
Try using an unshielded inductor to see 70-655 if the noise goes away. If you need a shielded inductor for that part for other reasons, try 70-656 using a toroidal inductor instead (it is self-shielding for generating external B-fields, not for being immune to external interfering B-fields).