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From: email@example.com (Bob Wilson)
Subject: Re: power supply pwm design help
Date: Sun, 29 Sep 2002 18:06:02 -0000
Organization: Your Organization
X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit)
In article , firstname.lastname@example.org says...
>"Bob Wilson" wrote in message
>> In article ,
>> email@example.com says...
>> >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
>> >have is it is overly sensitive. It can run in 2 modes, PWM or PFM. PFM
>> >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
>> >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
>> >blows at high currents!
>> >I cant really switch the modes back and forth because i dont have a way
>> >monitor the current loads. I may have to implement this later if i dont
>> >another solution.
>> >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
>> range from well below to well above Vin (with the same output polarity as
>> input polarity).
>So Bob, when you say "standard Buck-Boost topology topology" do you mean
No, not at all. See my parallel post for a more complete description. The
topology I refer to is essentially the Buck and Boost merged into one. It
has been around for years, although for some reason seems to be not all
that well known. It is part of the Flyback family, and (unlike the SEPIC) is
easy to understand and implement, and simple to make.
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