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From: Tong Narak
Subject: Re: I made 1.2V DC-DC converter to 5V drive 4 whiteLEDs in parallel
80mA. The output drop to 3.4v is correctly ?
Date: Wed, 04 Dec 2002 14:28:46 +0700
Organization: C.S. Communications Co. Ltd.
References: <3DEC9F43.DB1EC850@fanwap.com> <3DECC46C.B19C6D4C@fanwap.com>
NNTP-Posting-Date: Wed, 4 Dec 2002 07:28:51 +0000 (UTC)
X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U)
Gernot Fink wrote:
> > Is these the normal behavier of DC-DC voltage regulator ?
> >> > P.S. I used a MAX756 in a DIP300 package and an inductor from Wilco,
> >> > 0.070 ohms D.C.R. The input is one ni-mh cell, 1.3v dropping to 1v
> >> > when at full load.
> Also check that the inductor dont go in saturation under full load.
> It is possible that the inductor cant store enough enrgy for your
From Wilco Inductor SFB220 spec.
Saturation DC AMPs - 2.7
I AMPs suggested - 1.28
D.C.R OHMs - 0.060
I think these is a very good inductor.
My load are 4 SuperBright LEDs in parallel
without any resistor and they take only 80mA.
The output of MAX756 ( 5 volt regulate ) drop to 3.4 volt.
When connected only 2 LEDs, they take 150mA and
output drop to 4.3 volt.
Is these the normal behavier of DC-DC voltage regulator ?
I am very newbie.
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