On 17/01/2013 2:18 PM, David Duffy (AVD) wrote:
> I have the need to regulate the voltage going out to some LED strips.
> These strips are simple 12V DC types that have 3 LEDs and a resistor per
> section, repeating throughout the strip.
>
> The voltage available is nominally 12V, but can vary between 12V and
> 14V.  The ability to handle up to 18V input is also desired by the
> client.  The current draw of the LED load is approx 3 Amps.
>
> My next thought was to use a PIC12 to PWM a logic level MOSEFT and use
> the A2D in the PIC to sample the output voltage via an R/C network.  In
> theory this will allow me to regulate the output and even allow for a
> dimming function to be offered as an option.

Whilst sketching this out another thought popped to mind.  Since the=20
load is fixed, is there any reason not to use the A2D to sample the=20
input voltage and just PWM the output inversely proportional to that? =20
(feed-forward instead of feedback)

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
___________________________________________

--=20
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