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TPS40210 GDRV pin action principle

Red Yen
Expert 4360 points
Other Parts Discussed in Thread: TPS40210

Base on spec page11, functional block diagram, customer wnats to know the GDRV pin action principle more clearly.

Thank you~

  • 0
    TI__Guru 56925 points

    Red Yen,

     

    The GDRV pin of the TPS40210 is the output of the MOSFET driver.  This pin converts the internal fixed frequency current mode control PWM signal into an external, high current signal for driving an external MOSFET.

     

    The PWM of the TPS40210 controller is set HIGH when the RC clock pin transitions low IF Vcomp > Vvalley (approximately 1V)

    The PWM of the TPS40210 controller remain HIGH until the sum of Vrc + Vvalley + 6x Visns is greater than Vcomp.

    When Vrc + Vvalley + 6x Visns > Vcomp, the PWM transitions LOW until Vrc triggers the VDD/20 comparator and transitions low again.

     

    When PWM is "HIGH" GDRV has a low impedance connection (approximately 8Ohms) to BP

    When PWM is "LOW" GDRV has a low impedance connection (approximately 8 Ohms) to GND