Wesley Moore wrote:
>I am only driving LED's. I have a 22 x 10 matric of 3mm LED's. The reason I
>want to vary the voltage is to provide display dimming in the dark since the
>unit is destined for my car.
>

The 2803 is basically an on-off switch. If you want to vary the
intensity of the LEDs, you can do this by using PWM with variable
pulsewidth as input to the 2803. No need to vary the load voltage.

best regards,
- dan michaels
www.oricomtech.com
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