Why not just PWM all the way to the LEDs? Then you don't need a regulator.

-- Bob Ammerman
RAm Systems=20

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
David Duffy (AVD)
Sent: Thursday, January 17, 2013 12:36 AM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] Simple PWM Regulation

On 17/01/2013 3:06 PM, Bob Axtell wrote:
> This is really a stepdown regulated power supply project. You will=20
> need a good MOSFET, a fast diode, an inductor, a low ESD capacitor,=20
> then a pic10fxxx to drive everything. The PIC will charge the=20
> inductor, then the inductor will charge an output capacitor according=20
> to the PIC's A/D value. Another A/D input will have to be a reference=20
> voltage input, such as two 1n4148's in series.
>
> You might take a look at Roman Black's regulator, if I remember=20
> correctly, it is very close to what you need.

Will those solutions let me run the input right down to the target voltage
though? (12V out when input drops to 12V)

I was thinking the PWM should allow Vout to be the same as Vin (except for
the MOSFET loss) when the PWM is at 100%.
David...

--
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David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: www.audiovisualdevices.com.au
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