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TPS92515-Q1: The small leakage path of high-side FET

Wendy Wang1
Genius 17130 points
Part Number: TPS92515-Q1
Other Parts Discussed in Thread: TPS92515

Hi,

In the datasheet of TPS92515, 8.3.11 PWM (UVLO and Enable) says that "The high-side FET driver has a small leakage path to the output. Although very small(<<100μA), theLEDs could glow if the current was not eliminated. The 100-μA (typical) pulldown is activated and held ON while PWM is low and ensures no light output."

My question: The body diode of high-side FET is from SW to VIN, then what is the "small leakage path to the output"?

Thanks&Best Regards,

Wenxiu

  • 0
    TI__Intellectual 2590 points

    Wenxiu,

    The leakage is created by the high side gate driver circuit.  The leakage path is from the internal driver circuit and exits the TPS92515 through the SW pin, flows through the inductor, and then through the LEDs to GND.  This is why we create a 100uA pulldown from SW to GND inside the TPS92515.  This prevents that current from going through the LEDs by providing an internal path in that situation.

    -JP