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From: "Daniel M"
Subject: power supply pwm design help
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Sat, 28 Sep 2002 23:12:36 GMT
NNTP-Posting-Date: Sat, 28 Sep 2002 16:12:36 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
I am having a problem with a power supply circuit. Here is the situation....
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 i
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 find
Any help with the circuit or another alterative would be appreciated!
Please cc email!!
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