Soft-latch auto-reset OFF (hold) / ON (press) button, is the schematic correct?

Question

I'm looking to make a soft-latching interface with a single momentary push button.

Required features for my build are (edited, sorry for bad description) :

• Circuit should always start in OFF position (hence auto reset) ;

• Should work as press to power ON, hold to shut down ;

• Must be compatible up to 60V ;

• Must be able carry the battery's nominal voltage to the module it switches ON and OFF (said module needs high voltage to go HIGH else it stays LOW)

Can you please tell me if anything is wrong ? How should I solve it ?

Thanks

Edit (2) : For the 5v regulator I use a LM317HVT with a pair of resistors. NAND used is a CD4011 and mosfet used to switch ON/OFF is an irf510.

Answer 1

With a little bit of cooperation from the host, you can do this entirely with discrete devices. See this answer here: How can I make this "automatic turn off" work using some GPIO pins on a MCU?

These circuits will need a bit of modification to work with 60V: voltage dividers to limit the FET gate-source voltages. But otherwise they meet your criteria for reliable power-on state and switch denounce: instant-on with the first button press, and the micro can then monitor the button and implement the hold-for-off function.

I would also recommend using a step-down DCDC, maybe even a flyback type, as the regulator losses for a linear type will be large. Here’s an example that’s just $3. https://www.ebay.com/itm/152828093871

Answer 2

This "analogic" circuit simply delays switch contact >0.5s and debounces the switch. There are far simpler ways to do this with a single RC filter and Schmitt trigger gate.

There is no latch.