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From: John Larkin
Subject: Re: I never success with 1 cell Step up switching...
Date: Mon, 11 Nov 2002 21:17:41 -0800
Organization: Posted via Supernews, http://www.supernews.com
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On Tue, 12 Nov 2002 10:15:19 +0700, Tong Narak
>I tried to test many Chip ICs from TI but never success.
>I use instant inductors that look like resister green color
>and a blue type. Both are fail. I solder all components
>as short as possible directly to IC ( DIP300 type ).
>The output voltage is lower than the design spec.
>By the way, One IC from MAXIM MAX761 is success!
>Laughs !! I mounting on stripboard and it work very well.
>The efficiency is ~55%. These IC require 2 cells battery.
>input 2.4v 180mA
>output 12v 20mA
>MAXIM still didn't send me sample MAX619 and MAX757 to test.
>I am waiting..them...
>There are many surface mounting ICs. But I don't have idea
>how to solder them how to make a PCB that very tiny line.
If you are using little inductors that look like 1/4 watt resistors,
they probably have too much resistance. You need a more serious
ferrite-core drum-type or other proper inductor. The IC manufacturers
usually suggest suitable parts.
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