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ADP2303 ripple

Question asked by JelleN on Nov 5, 2013
Latest reply on Nov 13, 2013 by JelleN

Hi,

 

A ADP2303 provides the power of an AD1974 @ 16kHz in my circuit. But when I listen to the audio a weird tone is hearable. This tone seems to be introduced by the ADP2303 (the tone changes when I change inductor value).

 

The current setup is: Vin = 12V, Vout = 3.3V, Vd = 0.3V, L=3.3uH, Cout = 4x47uF X5R + 1x 100uF tantalum. I also tried without the tantalum capacitor but this seems to increase the ripple.

 

According the datasheet a 30% Iripple with a Iload of 0.15A will require a 270uH inductor but the inductor value should not be higher than 15uH.

 

Does anybody have any suggestions/ideas?

 

Kind regards,

 

Jelle

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