The LEDs are part of an LED strip with integral resistors.   There is=20
only a 12V connection at one end available.

On 17/01/2013 11:36 PM, Bob Ammerman wrote:
> Why not just PWM all the way to the LEDs? Then you don't need a regulator=
..
>
> -- Bob Ammerman
> RAm Systems
>
> -----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
>> need a good MOSFET, a fast diode, an inductor, a low ESD capacitor,
>> then a pic10fxxx to drive everything. The PIC will charge the
>> inductor, then the inductor will charge an output capacitor according
>> to the PIC's A/D value. Another A/D input will have to be a reference
>> voltage input, such as two 1n4148's in series.
>>
>> You might take a look at Roman Black's regulator, if I remember
>> correctly, it is very close to what you need.
> Will those solutions let me run the input right down to the target voltag=
e
> though? (12V out when input drops to 12V)
>
> I was thinking the PWM should allow Vout to be the same as Vin (except fo=
r
> the MOSFET loss) when the PWM is at 100%.
> David...
>
>

--=20
___________________________________________
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
___________________________________________

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.