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TPS27081A: Adding shutdown feature to MC33063A, MC34063A switching regulators

Part Number: TPS27081A
Other Parts Discussed in Thread: MC33063A

I saw such a circuit in the MC33063A datasheet for on/off operations, but do we need to do any pull-up or pull-down for ON/OFF?

Can I ON/OFF directly from the processor with 3.3V-0V without doing anything?

Can give me information about how to do it?