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TPS54332 EN pin

Christopher Smythe
Prodigy 10 points
Other Parts Discussed in Thread: TPS54332

Hi all I am currently in the process designing a power supply for an application.

The parameters are as such

Vin = 5.5V to 28V

Vout = 5V

Imax = 2.5A

I got my design almost complete apart that i need to switch the power supply on and off by using a micro-controller pin, I could use a mostfet/fet switch the Vin but i notice

there was a EN pin on the TPS54332, My question is how would i go about it to use it instead of adding more components for the mosfet/fet switch.

The micro-controller pin output is 3.0V and 5.0V (two different devices but they need to work with the same power supply).

If this is not possible could anyone suggest a mostfet/fet switch design to suit this parameters.

Thanks in advances

Chris

  • 0
    Mastermind 7395 points

    You can use any of the microprocessors, no matter what voltage they work. Simply define the microprocessor output as open drain or open collector.

    "Enable pin. Pull below 1.25V to disable. Float to enable. Programming the input undervoltage lockout with two resistors is recommended"

    You can also include the two resistors for the UV threshold. The processor output is connected to the center point of the UV voltage divider (the EN pin). When the microcontroller outputs a cero, the PS is disabled. When it outputs a "1", since the output is OC/OD, the pin floats and the PS is enabled when the voltage in the Vin is > than the UV threshold.