DRV8434S: Can the charge pump capacitor value be 33nF?

Nick Lu

Part Number: DRV8434S

Tool/software:

Can the charge pump capacitor value be 33nF?

0 David Medis 5 days ago

Hi Nick,

It is suggested to use a X7R, 0.022uF ceramic capacitor on the charge pump.

Best,

David

0 Nick Lu 5 days ago in reply to David Medis

What happens if I use 33nf?

0 David Medis 5 days ago in reply to Nick Lu

Hi Nick,

Why would you like to use a 33nF capacitor here?

What is the application?

Best,

David

0 Nick Lu 5 days ago in reply to David Medis

To unify capacitance values, reduce capacitance types.

+1 David Medis 3 days ago in reply to Nick Lu

Hi Nick,

Load transient behavior of CP voltage depends on the VCP-VM cap. Load regulation depends on CPH-CPL fly cap.

Using C(VCP) at 220nF, and CPH-CPL is 33nF would be ok.

Best,

David

0 Nick Lu 2 days ago in reply to David Medis

OK, thank you very much

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