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SG3524: Pwm with a sense voltage

Vincent HURET
Prodigy 80 points
Part Number: SG3524

Hello

I am using the SG3524 with the pin 1 connected to 9 and adjusting the PWM with the voltage on 2 ( potentiometer ); I join the drawing ( Dont' pay attention on PNP and NPN for Mosfet, it is N and P chanels..mistake )

Now, I want to adjust the PWM versus the voltage that I detect on a current sens resistor.

A control loop response system

The problem is that the PWM is ordering a MOSFET that opens another MOSFET. 

Does somebody have an idea how to manage that ? 

Regards to all from France and have a nice week-end

Vincent

  • 0
    TI__Mastermind 34465 points

    Hello Vincent,

    Your sketch does not have the detail required to know what is happening in your set up.

    The easiest way to operate with an external pwm is if you use the open loop test circuit shown in the data sheet.

    This is shown in the above attachment.

    Regards

    John