LR7843 Mosfet Control Driver Module Opto-Isolated MOS Tube Relay 30V 161A

LR7843 Mosfet control Module features with optocoupler to provide electrical isolation between the high-powered MOSFET side and the logic signals used to control the module this will prevent damaging the MCU if something goes wrong in the load connections and also increases the rigidity of the interference. PWM speed regulation is widely used to control the start and stop of the motor. The signal input side can be soldered to the terminal or pin itself, compatible breadboard output can be soldered to the terminal or direct wire.

Widely used for switching applications requiring moderate to high currents of up to 161A at 30V. The circuit has an optocoupler on the input that separates the input from the output load voltage and is unaffected by the logic levels applied to the driving signal. It works well for basic ON/OFF operations like controlling a solenoid or PWM control like dimming an array of LEDs. Additionally, these modules may be connected in parallel to boost the power handling capacity.

Pinout of the Module:

• Three connections are needed for the module. A DC power source to power the device (load) being controlled, a logic signal to switch the MOSFET on or off, and finally, the load itself. There are provided solderable connectors, however, if direct wiring is preferred, these connections can easily be constructed.
• Driving Signal Connections:  Connections to the MCU are made using the 2-pin connector on the right side. It contains two holes on 0.1′′ centers that can also accommodate a conventional male header, which may be useful in a breadboard arrangement, and two holes on 4mm centers that support a two-position screw terminal. PWM stands for the signal and GND for the signal ground on the pins.
• DC Load Power Supply: is attached to the three 3-pin screw terminals on the rear of the module that are designated +, LOAD, and -. The ground connection is connected to - and the positive lead of the power supply is connected to +. A load power supply is supported by the module.
• Load:  The load which is being driven is connected to the screw terminals marked + and Load on the back of the module.  The positive lead of the load connects to the + terminal and the negative lead of the load connects to the center load ground terminal.
• The signal ground and the load ground connections are not connected together on the module due to the optoisolator being used to provide isolation between the MOSFET power circuit and the MCU.

Note: Add a fly-back diode if an inductive load is being controlled. This will overcome the possible damage from the back EMF generated when the load is switched off. Do not expect to run at the maximum currents of these MOSFETs with this minimal heat dissipation capability of the modules. However, it is possible to parallel these modules to increase the power handling capabilities or to use heat-sinking Technic.