LM2940, 7808 and Multichannel PWM chip

D

djb

I'm putting together a circuit board to power and dim 5 LED channels.

The average voltages on the channels are 12.3V, 11V, 11.4V, 7.8V, 6.6V, and max current is 1A.

So my current plan is:

12V Constant Voltage Power Supply input... splits into three LM2940CT-12 LDOs, and two 7808 linear regulators.

So I should have more or less 3 x 12V and 2 x 8V signals. Then I'll use a microcontroller with 5 x 5V PWM outputs to switch five line-level N-MOSFETs (eg. IRL520N), to dim the 12V and 8V signals before they reach the 5 LED channels.

I'm a noob at electronics, so there might be a better way. Looking for confirmation or suggestions on how to improve this design.

Thanks
 

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