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TPS2H160-Q1: The risk of CL pin connect with board GND

Ted Xu
Expert 3805 points
Part Number: TPS2H160-Q1

Hi BU team

TPS2H160-Q1 was designed in their ADCU board for POC rail and below reverse-current external protection circuit was implemented in the board. The diode was Schottky diode　NSVBAT54SWT1G which have less than 0.43V Vf voltage at 10mA load under -40 degree. 

But customer made a mistake on CL pin's GND connection and the current limit resistor was connected to the board GND not device GND. Customer found that tps2h160-Q1 can work normally under room temperature. 

Would you help share your comments on the risk if customer don't re-design the board on CL pin? Whether will the maximum 0.43 potential voltage between device GND and board GND make tps2h160-Q1 not work?

Thanks 

  • 0
    TI__Mastermind 28385 points

    Ted,

    The device will operate fine in DC steady state operation- however the limit of the current limit would be indeterminate at this point. The CL pin works by acting as a current source that creates a reference voltage via the resistor attached to the ILIM pin. It uses this reference to set the custom current limit. With the diode in the way of where the reference is being created- the actual set current limit would be shifted to account for the voltage drop of the diode.

    We cannot speculate HOW the current limit will be affected or give any sort of guidance on the deviation,  however at the worst case the device would default to the internal current limit of the device:

    This mode is made for when the ILIM resistor is out of range or some damage happens to the resistor where it is either shorted or open. The device is guaranteed to survive safely with the internal current limit.

    Best Regards,
    Tim