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TPS43060 : Output is not go zero in off-state

JEONG HEON SHIN
Prodigy 10 points
Other Parts Discussed in Thread: TPS43060

I've designed with TPS43060 based on webench.

Vin : 12V

Vout : 36V

When EN pin is float, output is around 36V

But, when I connect EN pin to GND, output is not going zero.

It shows around 12V (11.8xxV).

In that state,

VCC (Pin 10) : 0.389V

BOOT (Pin 11) : 12V

HDRV (Pin 13) : 11.746V

LDRV (Pin 8) : 0V

In my thought, HDVR have to go zero but it is too high.

What's wrong in my schematic?

  • 0
    TI__Mastermind 35185 points

    Hi Jeong,

    This is normal for boost converters. When the part is not switching there is a direct path from VIN to VOUT through the current sense resistors, inductor and body diode of the high-side MOSFET. When the part is disabled the output will be slightly below VIN. If this needs to be avoided with your application, an external load disconnect switch would be needed on the input. Alternatively some other controllers integrate a gate driver for a load disconnect switch on the input.

    Best Regards,
    Anthony