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From: "Mike Engelhardt"
Subject: Re: power supply pwm design help
Date: 30 Sep 2002 14:53:01 GMT
Reply-To: "Mike Engelhardt"
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
> The SEPIC topology my not be the best choice here. It uses two inductors
> compared to one for the buck-boost or as Mike calls it, the four switch
> topology. The SEPIC also has a right plane pole and the buck boost does
SwCADIII picked a coupled SEPIC. No right plane pole. To convert its
solution to an uncoupled SEPIC using two inductors, (i) remove the
mutual coupling, (ii) double the inductance that each winding had
(iii) make sure that the SEPIC coupling cap is large enough, (iv) design
a compenstation/make sure it's stable.
> It's interesting that SC did not select the buck-boost topology and the
> LTC3440 which would be a perfect fit. Maybe SC does not like the
> topology? Have you brainwashed it to think this way Mike?
> More info is needed before the optimum topology can be selected.
The 3440 is a voltage mode part, so the conpensation needs to be designed
for the application and one would want more information about the
The current-mode coupled SEPIC is a really easy no-brainer way of doing
I recommend using it. It's certainly a much simplier method than using four
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