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[DPRG] Power conversion

Subject: [DPRG] Power conversion
From: Kipton Moravec kip at kdream.com
Date: Thu Dec 26 10:08:01 CST 2002

I have a circuit that works.

It uses the LT1617-1 The chip documentation shows an example.

There is a reference design for a -33V Inverting Charge Pump Inverter.
I changed the inductor to a 22 uH inductor from Mouser.  And instead of the
4.7 uF capacitor I used a 100 MFD electrolytic and a .1 uF bypass capacitor
in the input.   I used another .1 uF bypass  and  another bigger cap on the

They had a 619K and 24.9K for their resistor divider.  I needed -24V
not -33V and I wanted to use more common resistors, so I switched the 619K
to a 200K and the 24.9K to a 11K (a 10K and a 1K)  all resistors were 1%


----- Original Message -----
>From: "Chuck McManis" <cmcmanis at mcmanis.com>
To: "DPRG" <dprglist at dprg.org>
Sent: Thursday, December 26, 2002 1:33 AM
Subject: [DPRG] Power conversion

> Has anyone here needed to convert 5V into -21V ? I'm trying to hook up an
> LCD panel which needs a -21v bias voltage and I have yet to find a decent
> way to generate that voltage from the existing 5v supplies...
> --Chuck
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