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Can I tie the on/off pin of the R-78AA family to the Vin pin if Vin goes up to 32V?
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The absolute maximum voltage accepted in that pin is 15V, although its not recommended to go higher than 5V. You cant connect the input directly to the control pin
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How does the enable pin on the R-78AA series work?
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The enable pin has two functions: Below 2.6V, the converter is OFF (the output power stage is switched off, but the converter oscillator is still running). Below 1.6V, the converter is in ultra-low power mode ( 20µA shutdown mode)
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How does the enable pin on the ROF-78 work?
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The enable pin on the ROF-78 has a max voltage of ~15V.
1.25V is the threshold voltage, below that voltage the converter should be OFF. Above 1.25 the converter will be ON. The 0.9V and 1.55V values are recommended safety values to ensure that below 0.9 it will be OFF, and 1.55V it will be ON.
In short, if you want to ensure that the device is on continuously, apply >1.55V to the EN pin all the time
