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TPS65400 Enable pins

Nikko Li
Intellectual 490 points
Other Parts Discussed in Thread: TPS65400

I have two questions regarding the ENSWx pins on TPS65400. 

1. If I drive the pin externally, does the driving circuit need to be open-drain? What happens if VEN is above 1.28V?

2. Channel 3&4 are unused, so I connect ENSW3/4 to GND thru a resistor. However, since I set ENABLE_PIN_CONFIG to single Enable, the state on ENSW3/4 is ignored. Ch 3&4 are still enabled  when Ch 1&2 are operating properly. Is this a problem? 

Thanks

Nikko

  • 0
    TI__Intellectual 2590 points

    Please see my answer below:

     1. If I drive the pin externally, does the driving circuit need to be open-drain? What happens if VEN is above 1.28V?

    Don’t need, En pin only need high or low. Larger 1.28V, Vout will build up.

    2. Channel 3&4 are unused, so I connect ENSW3/4 to GND thru a resistor. However, since I set ENABLE_PIN_CONFIG to single Enable, the state on ENSW3/4 is ignored. Ch 3&4 are still enabled  when Ch 1&2 are operating properly. Is this a problem?

    If you don’t change the software to enable Single enable function, CH3&4 will shut down if you full enable 3&4 to GND.

    thanks!