PWM Controller Current Source

Thread Starter

Nickylay

Joined Jun 16, 2021
1
Hello I am trying to make a PWM Controller Current Source to gain 0-0.7mA using the scheme below. Can I use the pwm as the Vcc regardless pwm.can only supply 0.2 mA at max. If can't, are there any alternative for this?Screenshot_2021-06-16-16-07-29-36.jpg
 

Irving

Joined Jan 30, 2016
3,133
If your supply current is only 0.2mA you cannot 'gain' more current...

Why is your source so low current? What voltage does it produce?
 

Papabravo

Joined Feb 24, 2006
19,284
Getting a circuit to produce current gain REQUIRES a source of power that can supply the required current. If that were not the case you could make a perpetual motion machine and there would be unlimited free energy. These things are just not possible.
 

BobTPH

Joined Jun 5, 2013
5,761
A PWM signal is not a source of content current!

What you need is s low pass filter to covert the PWM signal into voltage followed by a voltage controlled constant source. It needs to be powered by an external source.

B
 

BobTPH

Joined Jun 5, 2013
5,761
He asked if he could use the PWM signal as the source, snd what alternatives there were. I believe I had enough info for my answer.

Bob
 
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