How can i do 12v pwm signal fixed 5v

 

Can you control the PWM duty-cycle?
If so just set the duty cycle to 5/12 = 41.7% and average it with a LC filter.

How much power is involved?

Do you need the 5V to be tightly regulated?

 

Can you control the PWM duty-cycle?
If so just set the duty cycle to 5/12 = 41.7% and average it with a LC filter.

How much power is involved?

Do you need the 5V to be tightly regulated?

i use 5v 1.5A Linear Voltage Regulator 7805 package to-220
i will turn on and off 32 led (32x30mA) with processors

 

You didn't answer all my questions.
Still unclear what the source is or exactly what you are trying to do.

 

You didn't answer all my questions.
Still unclear what the source is or exactly what you are trying to do.

Source is the pwm!!!
I will run the processor.
when i dont add LC. The processor is not working properly
L=? C=?

 

Not enough info to answer your questions.
What is the PWM's duty-cycle and frequency?
What is the source of the PWM?