It happens because of the formation of two parasitic BJTs (one pnp and another npn) in CMOS. This ability to turn the power MOSFET “ON” and “OFF” allows the device to be used as a very efficient switch with switching speeds much faster than standard bipolar junction transistors. Because their MOSFET switches consume no current in the OFF state, these circuits are useful for battery powered portable instruments. Standalone(no MCU). In electronics, a flip-flop or latch is a circuit that has two stable states and can be used to store state information. Well you can think latch up as a short circuit between the supply and ground. A momentary button press turns a power MOSFET ON, and holding it for a few seconds turns it OFF. When that happens, there isn’t power reaching the base of the transistor, so the MOSFET doesn’t let the current flow to the VIN pin, and there isn’t power consumption. Dаvid Jones through his Youtube channel EEVblog described in detail how to design a cheap soft latch power switch circuit, using one push button switch to toggle your circuit power on and off with the following design requirements:. However, I'm not 100% sure this is the case. A flip-flop is a bistable multivibrator. Re: Soft latch MOSFET circuit analysis « Reply #1 on: April 25, 2017, 05:57:09 pm » I had the circuit implemented a while ago actually and it works very decently (around the RC times, as designed). This circuit is based on the assumption that "E" is high when the FET is off. The Q2 NPN transistor does not have bias current to Base so no current pass through Collector-Emitter. My next step is to build this circuit, but I wanted to see if anyone could find something wrong before I buy the parts and try it out.

General components only (Diodes, Transistors, ..ect). Zero power when off. The voltage across Drain -Source is zero. If you want to drive this from an Arduino, which only outputs 5V, you will need a "logic-level" MOSFET. My favorite single transistor latch circuit is very simple, it doesn't need special chips that look like transistors or LEDs or anything like, just one other cheap and simple component, that is, another transistor. The structure formed by these resembles a Silicon Controlled transistor (SCR MOSFET: NTMFS4927NT1G. Speaking about CMOS transistors, latch up is the phenomenon of low impedance path in CMOS between power rail and ground rail due to interaction between parasitic pnp and npn transistors. Part numbers: D-latch: SN74LVC1G373DCKR.

5) When we want to power off the circuit, we simply need to set the GPIO to LOW. It might be possible to build a circuit with "one" transistor but I don't think it would be simple. A latch is an electronic logic circuit that has two inputs and one output. One on/off switch. How the Feedback from R3 Works to Latch the Circuit. Latch circuits can be either active-high or active-low. When we press S1(CLOSE), an electric bell will not loud suddenly, also above circuit now the C1’s voltage as hight so Q1 MOSFET active. The circuit can be made to change state by signals applied to one or more control inputs and will have one or two outputs. However the introduction of a feedback voltage through R3 makes a huge difference to the configuration and helps to generate the required feature in the circuit, that is the BJT circuit instantly latches or freezes its output with a constant positive supply. Thanks!

The MOSFET you selected (IRFZ44N) is a "standard" MOSFET and only turns on when Vgs=10V or higher (up to the maximum rating of 20V, which you should stay away from), so 10V-15V is common for Vgs for this type of MOSFET. Application note for electronic latch circuits using logic gates and MOSFETs that detect a push button press to switch ON power to your embedded system.

Latchup refers to short circuit formed between power rails in an IC leading to high current and damage to the IC. One of the inputs is called the SET input; the other is called the RESET input. The difference is determined by whether the operation of the latch circuit is triggered by HIGH or […] When using the MOSFET as a switch we can drive the MOSFET to turn “ON” faster or slower, or pass high or low currents.

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