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TL494: Unused Terminal

Hirotsugu Kobayashi
Mastermind 9530 points
Part Number: TL494

Hi, team.

When not using FB(#3), how to terminate FB pin?

Best Regards,

  • 0
    TI__Mastermind 25570 points

    Hello Kobayashi-san

    Connect the pins as shown below. This forces the output of the error amplifiers to 0V - the diodes in the error amplifier outputs are off in this condition and isolate the FB pin from the EA outputs. You can then set the FB pin at whatever voltage you want in order to get the needed duty cycle at the device outputs. You can tie FEEDBACK to GND if you wish - the PWM comparator will be inactive unless Vfb is greater than the 700mV offset at the PWM comparator.

    Regards
    Colin