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TPS62097-Q1: The method of canceling discharge by 165ohm in silicon at EN=Low

yu ma
Prodigy 10 points
Part Number: TPS62097-Q1
Other Parts Discussed in Thread: TPS62097

Dear TI colleagues,

TPS62097-Q1 is supporting pri-bias SS. Nevertheless TPS62097-Q1 is having also discharge function with 165ohm in silicon.

This function will occur the problem that other power supply load current increases.
*The other power supply is connecting also to output of TPS62097-Q1 as per-bias source.

Therefore, I want to disable the discharge function at EN=L.

Can you suggest the method for canceling discharge by 165ohm in silicon?

Regards.
Maekawa

  • 0
    TI__Genius 13240 points

    Hi Maekawa,

    Unfortunately for the TPS62097-Q1, there is no way to turn off the internal output discharge.

    However, the FET that connects the output discharge, requires a certain VIN voltage (>1V) to turn on. So the only possibility is if you ramp down the VIN quickly (<~100us), the output discharge FET will be able to turn on only for a short time. This way you can prevent the VOUT discharge. But this also depends on the value of VOUT in your application. If VOUT is >2.2V (UVLO) this method also won't be effective as the output would ramp down with the VIN in 100% mode till UVLO.

    Startup into pre-bias is applicable for the condition where there is a fast VIN ramp down and VOUT is not completely discharged.

    Another option is to add a load switch between the TPS62097 output and the load. For example if there are 2 output caps, the load switch can be added in between. The load switch can be turned off with the same signal that disables the EN of TPS62097.

    Is the load current small for the set VOUT, that VOUT doesn't get discharged by your load?

    Best regards,

    Varun