Hi
I am trying to design a very basic circuit which converts my 5 V PWM from my NI FPGA card to a 12 V PWM.So basically what I need is an amplifier circuit and also protection for my FPGA card from 12 V.
I am a Mechanical Engineer and I dont have much idea .Can anyone of you help me.
If a circuit is available in the market which can serve my purpose you can tell me what I should ask for.

 

hi,
You require either a power transistor or MOSFET amplifier.

Do you have details of the current the motor requires thats driven by the PWM.?

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Eric
"Good enough is Perfect"

PIC tutorials:
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thanx for the reply...
But I am actually using the circuit for a solenoid fuel injector which works with 12V square pulse.
So only thing I need to do is amplify my 5V PWM to a 12 V PWM.

 

I would assume that the solenoid is ground referenced so that you need a high side driver. i would also assume that the 5V pwm signal is coming from a microcontroller and you don't want much current pulled out of it.

how about tying the 5V pwm signal to the gate of a peanut NFET, say a 2N7000. The source is tied to common/ground and the drain is tied to a 10k resistor whose other end is tied to 12V. Maybe have a 10k resistor across the gate-source to make sure it is off if the cpu is not awake but 12V is. Connect the gate of a PFET (don't know a good one off hand - i don't use them too much - but it needs to handle current - may need a heatsink as well) to the drain of the NFET, the source to 12V and the drain to the solenoid.

 

thanks for the suggestion....
Let me try it out.....
I shall keep updating.......