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From: email@example.com (Bob Wilson)
Subject: Re: power supply pwm design help
Date: Sun, 29 Sep 2002 03:39:25 -0000
Organization: Your Organization
X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit)
In article ,
>I am having a problem with a power supply circuit. Here is the
>The input is from a battery, 2.7v to 4.1v.
>The output is 3.3v up to 500mA!
>I am currently using a Fairchild part ilc6363 to do this, (The ILC6363
>step-up/step-down DC-DC converter is a switch mode converter). The problem
>have is it is overly sensitive. It can run in 2 modes, PWM or PFM. PFM is
>designed to be for low current and PWM is for higher current.
>If i run the part in PWM mode constantly, the output is not stable at low
>currents and can go up to 3.9v. This is too high for our CPU.
>If i run the part in PFM mode constantly, the part gets hot and sometimes
>blows at high currents!
>I cant really switch the modes back and forth because i dont have a way to
>monitor the current loads. I may have to implement this later if i dont
>Any help with the circuit or another alterative would be appreciated!
>Please cc email!!
Why the complexity? Use a standard Buck-Boost topology. Output voltage can
range from well below to well above Vin (with the same output polarity as
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