IRF840 | Datasheet, Circuit Diagram, Pinout, Equivalent Motorola

IRF840 Circuit

irf840 Pinout Diagram

The irf840 is an N-channel type MOS field effect tube using a TO-220 package. The main features are low gate charge, low feedback capacitance, and very fast switching, so it is used as a switching tube in most cases, such as high-efficiency DC-DC (where different DC voltages can be output by switching at different frequencies).
The use of irf840 in circuit design should be noted that: almost all of the mos tube in the circuit design, need to drive the circuit, the direct use of microcontroller or DSP output control signals are mostly not up to the MOS tube required to drive the voltage or current, so the need for driver circuit. Driver circuit is generally divided into current-driven and voltage-driven according to the MOS is current-controlled or voltage-controlled to choose the type of driver circuit. Specifically as shown in the following two diagrams:

Current Control Picture

Voltage Control Picture