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Subject: Re: What is LDO ( regulator ) ?
Date: Sat, 11 Jan 2003 19:58:47 +0700
Organization: C.S. Communications Co. Ltd.
References: <3E1FE33B.4FF09DBF@fanwap.com> <3E1FE42F.4944071F@fanwap.com>
NNTP-Posting-Date: Sat, 11 Jan 2003 12:58:48 +0000 (UTC)
X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U)
Thank you very much.. you answer is very clear.
You can be a teacher.
> "LOOK" wrote in message
> > Or it means = when full load the output voltage will drop very low ?
> > ex:
> > 7809 input 12v output 9v
> > at load 1A the output will drop to 7v ???
> > I guess this is wrong.
> Yes, it's wrong. An LDO regulator will be able to maintain the required
> output voltage, even when the input voltage is only little higher than the
> output voltage.
> The 7809 is not an LDO regulator. If the input voltage drops below 11V
> (IIRC), the output voltage cannot be maintained at 9V anymore and will
> decrease accordingly.
> A 3V LDO, for example, may maintain a 3V output with input voltages as low
> as 3.2V (depending on device type and output current).
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