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Old 03-13-2014, 05:33 AM #1
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Default Use a momentary / tactile button, as a latching switch - circuit?

I'm looking for the smallest possible circuit that will allow a low current momentary button to operate as a high current latching (ie, on/off) toggle switch. In other words, it's more than just driving a MOSFET, the circuit needs to flip between on / off states.

There are a number of approaches online, but I'm hoping for one that draws no quiescent (standby) current. Failing that, I'm just looking for minimal part count.

Any suggestions?


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Old 03-13-2014, 10:15 AM #2
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

What you're looking for is a bistable flip flop to drive a MOSFET. There are both discrete BJT and IC designs (like using a 555). It's also called a power latch as when it's used to outsource the power line switching to a FET instead of a mechanical switch. There's always quiescent current being drawn in the off state unfortunately, but it can be kept to a minimum through good design.


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Old 03-13-2014, 03:19 PM #3
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

What's your supply voltage? I have used those cheapie keychain lights that use a momentary tact switch to turn an LED on or off with a chip on board circuit that runs off of 3 button cells.

I just took out the PCB, trim it to size and use a switching device (mosfet, relay etc) that can handle the current.
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Old 03-13-2014, 03:51 PM #4
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

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Originally Posted by djQUAN View Post
What's your supply voltage? I have used those cheapie keychain lights that use a momentary tact switch to turn an LED on or off with a chip on board circuit that runs off of 3 button cells.

I just took out the PCB, trim it to size and use a switching device (mosfet, relay etc) that can handle the current.
6V to 8.4V

I looked at bistable flip flops, but it doesn't seem like there are any ICs that run on my supply voltage, or for that matter, don't require 3 or 4 external components in addition to the MOSFET.
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Old 03-13-2014, 03:58 PM #5
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

That's a little high. Not sure what parts you have access to but if it were me, I would use a CMOS regulator (which draws nearly no quiescent current with no load, Torex and the like have a bunch of types) to drop the supply down for the COB flip flop then use a FET as a power switch.
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Old 03-14-2014, 01:35 AM #6
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

IIRC Dave from the EEVBlog did a video of a fully discrete power latch with very low quiescent current and a wide operating voltage, it might be worth looking in to. I don't know that you'll find a monolithic (chip + add a FET) solution though. You would think there would be one, but I haven't seen one used nor referenced so far.

Again, I always used a 555 for this until I went and moved on to using a uC for this kind of thing.
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Old 03-14-2014, 02:29 AM #7
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

You can also use an On/Off switch from RatShack (if any are open yet)
to drive the Mosfet. Use some resistance to ground for reliable shutoff.
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Old 03-14-2014, 11:15 AM #8
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

a SCR will latch on until A) it drains the the source voltage below its holding current or B) u remove the batteries
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Old 03-16-2014, 09:51 PM #9
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

Quote:
Originally Posted by Sigurthr View Post
IIRC Dave from the EEVBlog did a video of a fully discrete power latch with very low quiescent current and a wide operating voltage, it might be worth looking in to.
I just started watching this video. I was about to get really frustrated because it's 17 minutes long, and I just wanted the "bottom line".... but this guy won me over when he held up a whiteboard with the requirements:

1) Zero power when off
2) One on/off switch
3) Standalone (no micro controller)
4) Jellybean parts only
5) Minimal parts

I'm SOLD!

What do you guys think of this circuit? I'm going to create a board now. I'm happy to share the final board with the forum.



To see the video referenced above, take a look here:
https://www.youtube.com/watch?v=Foc9R0dC2iI
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Old 03-16-2014, 11:02 PM #10
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

The only problem I see is that the units on your capacitor are Henries
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Old 03-16-2014, 11:45 PM #11
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

Quote:
Originally Posted by ARG View Post
The only problem I see is that the units on your capacitor are Henries
Watch out, or I'm going to come hunt you down with my 2,000 MW laser. It's really powerful because the driver supplies 2400 mAh of current.

Okay, here we go. It's a 1cm square latching circuit. I'm going to order some up tonight. Total part cost is under $2.



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Old 03-17-2014, 01:54 AM #12
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

Looks good. More elegant than my suggestion
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Old 03-17-2014, 02:34 AM #13
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

MMMMmmmmm???? Maybe I will use one of these very small units in the Dragon's Head Red ???????? Very small....and unique !!!! Will this handle the current from two (2) 18650 LiPo....at 7.4 VDC ????? THANK YOU.

Lite'em up CDBEAM=======>
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Old 03-17-2014, 02:52 AM #14
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

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Will this handle the current from two (2) 18650 LiPo....at 7.4 VDC ????? THANK YOU.
I don't know... you asked me if it will handle the current from your setup, and then proceeded to tell me everything except what that current is
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Old 03-17-2014, 03:05 AM #15
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

You can use this circuit to control a pass FET of your choice for high power applications by adding one resistor and your pass FET.

RHD, this is the EEVBLOG board right? Let me know how much these boards cost, I'll definitely buy at least one from ya.
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Old 03-17-2014, 03:16 AM #16
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Default Re: Use a momentary / tactile button, as a latching switch - circuit?

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Originally Posted by Sigurthr View Post
You can use this circuit to control a pass FET of your choice for high power applications by adding one resistor and your pass FET.

RHD, this is the EEVBLOG board right? Let me know how much these boards cost, I'll definitely buy at least one from ya.
Sure thing! But I wouldn't charge ya for it. Just remind me in two months, lol, Oshpark takes months of lead time to arrive here in Canada

Or would you prefer I just give you the brd files?

I wasn't planning to sell these, just figured I'd release the schematic / board open source once tested. It's basically the EEVBLOG circuit. I chose a 4A MOSFET (I think - not on my pc right now), and used a dual NPN IC, but otherwise it's basically the same circuit.
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