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Enable/disable TPS544B20

Other Parts Discussed in Thread: TPS544B20

Hi,

Is there any pin configuration that enable/disable TPS544B20? I don't prefer PMbus. Thanks.

  • Hello, The CNTL pin can be used the same as an analog Enable pin.
  • By default the device is configured to turn on by the CNTL pin. The CNTL pin is active high, being made for 3.3V logic. It has an internal pull-up, so it will float high if not connected. This behavior is controlled by the ON_OFF_CONFIG command, it can also be configured to start converting whenever sufficient input voltage is present.
  • Thank you, Matt.
    Does it mean when the very first time I enable tps544b20, I have to configure the ON_OFF_CONFIG before it? What I want to do is just let it run by itself and I don't need any PMbus operation.
  • Hello,

    By default TPS544B20 is configured to convert power when its CNTL pin is high. The CNTL pin functions like a traditional analog "enable" pin. If its left floating, then the CNTL pin will pull high by itself, due to an internal pull-up current source on the pin, so the TPS544B20 will start converting power whenever input power is present. The CNTL pin can also be used  like an "enable" pin. Pull it high to convert power, pull it low to stop converting power. 

    The ON_OFF_CONFIG command can be used to change this behavior. For example, it can be set to ignore the state of the CNTL pin altogether, and always convert power whenever input power is present. It can be set to ignore the CNTL pin, and only turn-on by the PMBus OPERATION command. It can be set to enable/disable by the CNTL pin, with inverted polarity (Active Low), or even combinations of CNTL + OPERATION. 

    The factory default setting is CNTL pin only, Active high. And the CNTL pin will pull high by itself if its floated, as described above.