how to increase volt
Hi binary2007,
i'm sorry for the delay, i included here a part of a circuit i used lately.
i'm assuming here that u already got your 0 -- 5 volts pwm working and you already filtered it.
You will use the filtered PWM signal and amplify it with this AMP op based circuit. First thing to carry about is the use of a high voltage AMP OP ( 45 volts at least ).
I think Slew rate won't be a problem to your design since you're dealing with already stabilized voltage, slew rate would be benificial to your signal if it's still fluctuating .
The use of the Q1 transistor will allow u to reach the sighted amount of current, while Q2 with Re1 will prevent short circuits.
Of course, u'll have to choose the proper values to your components, making sure AMP op Gain is 9 ( the pots in the feedback loop will allow u to ajust that gain exactly to the requested value ...).
Now when everything is working ok , you will have to measure the output of your design through an A/D converter ( assuming that your controller already got one ).
with that u'll be able through your software to exactly match any requested voltage by adjusting duty cycle of your PWM signal . . .
This is the way i see it
. . .
Hope this helps,
Hassen.