Re: generating 180VDC at 5mA or so, simply...
From: Jeff (levy_jeff_at_hotmail.com)
Date: 09/01/04
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Date: Wed, 01 Sep 2004 00:24:42 GMT
You may want to take a look at the IC's designed to drive EL panels - these
should be just about the right current for a larger panel and the voltage is
in that range. Note that a EL panel requires AC, so you would need to
rectify and filter it to DC. Very small (SMT parts, usually designed to be
put into small hand held devices), cheap, very simple, usually requiring
only a few components, etc.
To achieve that 1% regulation requirement, it might be a little difficult,
and you may need do some interesting things, like post regulation on the HV
(2 W zener diode shunting excess voltage away, or an more elaborate setup
using a pass transistor), or regulate the low voltage while keeping the load
constant on the HV, feedback to control the PWM/EL panel driver, feedback to
control the voltage going to the EL driver such as a LM317 with feedback
from the HV which feeds the EL driver, etc.
Also, why the so tight regulation? You realize you want it to be within 1.8V
of 180V under all conditions? What are you intending to do with this 180V?
"Mike Deblis" <mdeblis@hotmail.com> wrote in message
news:ch2n7j$kvi$1@hercules.btinternet.com...
> Hi,
>
> I was wondering how to generate about 180VDC continuous at a few mA (at
> least 5) from 9-12VDC in (no mains).
>
> The MAX/LT etc. switchers are not in the frame for this - I want to do it
> very very simply - a minimum of discrete components (maybe a small
> hand-wound small inductor) - regulation is not critical but needs to be
> about 1% or so. No back-to-front mains transformers (far too big - it
should
> be very small).
>
> Ideas welcome - the simpler, the smaller, the neater, the better...
>
> Many thanks for any pointers,
>
> Mike
>
>
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