[SI-LIST] Re: inrush current

You can the following simple equations:

I =3D  V / ( T/C + R) when capacitor only got connected.
I =3D  V / ( L/T + R) when  inductor only got connected.
I =3D  V / ( L/T + T/C + R) when  capacitor and inductor both connected.

Plot I Current Vs time T, you'll get approximate inrush current or do =
spice
simulation.

Regards,
Padmanaban
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of caydin@xxxxxxxxxxxxxxxxx
Sent: Thursday, October 19, 2006 5:27 PM
To: santhosh.etavalath@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: inrush current


Santhosh,

You can determine the value of max current peak using spice simulation. =
The
main effect comes from the startup circuitry of the dc-dc converter.
If your's has a soft-start function, the duty cycle of the output =
transistor
switching time until soft-start threshold reach determines the amount of
current peak.

Regards,

Cengiz Aydin

On 19 Oct 2006 03:13 EEST you wrote:

> Hi,
> How do we generally calculate the inrush current in a dc-dc converter,
formula? We will have inductor and bulk capacitors at the input side of =
the
regulator.
> regards
> santhosh
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