[SI-LIST] Re: Switcher Efficiency Optimization
- From: bala <balaseven@xxxxxxxxx>
- To: olaney@xxxxxxxxx
- Date: Mon, 30 Jul 2012 14:24:01 +0530
Check Drop across series parts, FET's,etc..In your case,guess the drop is
much high.Use low Rds Device...below pdf has some useful info.
http://dspace.mit.edu/bitstream/handle/1721.1/41545/220911649.pdf
Regards
bala
On Mon, Jul 30, 2012 at 1:06 PM, O. Laney <olaney@xxxxxxxxx> wrote:
> For a mere 20 mA, shut the switchers off during standby and let small
> linear regulators carry the load. Yes, linear regulators are
> inefficient but not worse than the idle current of the unloaded
> switchers. There are other details related to output isolation and
> cascading, but this is the general idea. And yes, this is the wrong
> forum.
>
> Orin
>
> ------ Original Message ------
> From: "Tayyab Rahimkhan Pathan" <Tayyab_Pathan@xxxxxxxxxxx>
> To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
> Sent: 7/30/2012 12:10:26 AM
> Subject: [SI-LIST] Switcher Efficiency Optimization
> >SI Experts,
> >I am not sure if this is the correct forum to ask Power Supply related
> query but if anyone has experience pls share the knowledge.
> >
> >We have designed a Tab like system for security application. We are now
> trying to optimize the battery backup time by reducing the overall sleep
> current. Since we have used Switchers for 12V to 5V and 3V3 supply
> generation, in sleep mode (low load) the efficiency of switchers is very
> poor (<50%, I know for light loads the efficiency will be poor) because of
> which our sleep current target is not met.
> >
> >My query is how to optimize the light load (<20mA) efficiency of buck
> synchronous switcher (P/N TPS54521)?
> >
> >Regards,
> >Tayyab
> >
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--
bala
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