I’m wondering if it’s possible to use the PG pin on the D24V22F12 to drain the regulator after shutdown? I have a circuit which requires that the capacitors in the regulator drain as quickly as possible after shutdown. Otherwise, the remaining charge (voltage level) will cause problems when trying to power back up.
My experience from another Pololu regulator is that it will bleed off the remaining charge veeery slowly (several seconds before it drops below 2V). Adding an old-fashioned bleeder resistor is not an option. For the circuit to drain fast enough, this resistor wiould have to continuously waste 3 times more current than the entire main circuit is using.
My idea is to connect Vout to PG through a small bleeder resistor. When the regulator operates normally, the two voltages will balance each other. When power to the regulator is cut off, PG will drain the capacitors from Vout through the resistor.
Could this work? The regulator specs don’t state any absolute maximum current/voltage rating for the PG pin and I don’t particularly want to risk frying a $10 regulator by attempting to do this without checking first…
I’m of course assuming that PG has a “high” level similar to Vout, although I see that 6V is mentioned in a post (is this true?).