Re: high voltage charge pump

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From	Hul Tytus <ht@panix.com>
Newsgroups	comp.arch.embedded
Subject	Re: high voltage charge pump
Date	Tue, 31 Dec 2019 16:35:57 +0000 (UTC)
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Richard - what I'm looking for is an ic similar in results to Microchips 
tc7662 with an input voltage limit above 200 volts. The output current 
needed is only 60 ma. which is in the range of charge pump ic that I've 
seen so far.

Hul

Richard Damon <Richard@damon-family.org> wrote:
> On 12/30/19 8:53 AM, Hul Tytus wrote:
> >     Anyone familiar with a high voltage charge pump designed as a step down
> > power supply? The voltage is between 175 & 200. Numerous high voltage
> > versions exist using inductors, (Onsemi has one that is "self supplied"
> > which is attractive) but not a one that works with just a capacitor. Are
> > there any out there I've missed?
> > 
> > Hul
> > 

> Most charge pump designs will multiply voltages (invert or step up), not 
> divide.

> While a step down configuration is possible, I think it requires much 
> more careful choices of values and control law to keep the output from 
> getting too high of a voltage.

> Also, all charge pumps that I know use MULTIPLE capacitors, they 
> generally work moving charge in a controlled way, so generally require 
> at least one 'moving' capacitor to transfer with and one fixed output 
> capacitor to store the output charge.

> One reason you don't generally use a charge pump for step down is that 
> charge pumps are best used at very low current. For very low current 
> steo down, the simple linear regulator is normally a perfect solution 
> and often is as efficient or even better than a switched capacitor step 
> down system.

Thread

high voltage charge pump Hul Tytus <ht@panix.com> - 2019-12-30 13:53 +0000
  Re: high voltage charge pump Richard Damon <Richard@Damon-Family.org> - 2019-12-30 10:30 -0500
    Re: high voltage charge pump Hul Tytus <ht@panix.com> - 2019-12-31 16:35 +0000
      Re: high voltage charge pump Richard Damon <Richard@Damon-Family.org> - 2019-12-31 12:47 -0500
      Re: high voltage charge pump Rick C <gnuarm.deletethisbit@gmail.com> - 2019-12-31 16:30 -0800

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