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TPS92075 output short

Hiranthini Alles
Prodigy 100 points
Other Parts Discussed in Thread: TPS92075

The TPS92075 datasheet includes a current limit voltage 1.2V on ISNS. Would this cause an overstress of the switching MosFET and recirc diode (reset delay 280us) switching at a lower freq?

Thanks.

  • 0
    Expert 2585 points

    Hi,

    Voltage Vcl=1.2V determine the current level when control logic  switch off  the switching MOSFET. Taking into account that operated voltage at ISNS =0.5V, this mean that  current limit feature turn on when current increase more than 2x. This shouldn't overstress MOSFET if it was right selected.

  • 0
    TI__Intellectual 1115 points

    The 1.2V current limit threshold, if reached, will cause switching to stop and a 280us delay to occur before switching begins again.  This feature is really meant to help in cases where there is a very hard short circuit - like output inductor shorted, for example. Otherwise the 1.2V level is not likely to be reached because the regular operation of the deivce will already have shut the FET off before this level.  For example, in normal operation the parallel comparator will reach its threshold first at a level of 1V max, it takes a very low impedance short to have the current reach the 1.2V level, but in case it does, the longer restart will help save the device.