CQ220-8MFP

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Thyristors are a type of transistor that are able to use the effects of positive feedback to switch circuits "on" and "off." They are mainly used for controlling the voltage and current in circuits, and for controlling the amount of power going into a device. Thyristors can be divided into two distinct classes: TRIACs and SCRs. CQ220-8MFP is a TRIAC.

A TRIAC is a three-terminal semiconductor device that is used to control current in alternating current (AC) circuits. It is composed of two p-n junction diodes, connected in an anti-parallel arrangement, forming the two “legs” of the TRIAC, and a metal oxide film covering the three junctions. A TRIAC, like other thyristors, amplifies the effect of positive feedback and allows current to keep flowing in one direction or to stop and reverse according to the polarity of the control voltage. The power handled by a TRIAC is usually between 10 to 100 watts, and it can switch currents up to several hundred amps.

CQ220-8MFP is a high-power, low-voltage three-terminal TRIAC designed for use in a wide variety of AC control applications. It has an on-board independent dynamic armature and an on-board emitter gate, as well as a 120° gate trigger and a gate-to-emitter voltage of between 6 and 10 volts. Its main applications include switched-mode power supplies (SMPS), active filter circuits, and power amplification circuits, where it is used to dynamically control the voltage in the circuit. Its high switching speed and high trigger current range make it suitable for fast switch applications.

The working principle of CQ220-8MFP is based on the concept of positive feedback. When a positive voltage is applied to the gate, the small current flowing through the TRIAC junction increases, causing an increase in the TRIAC’s voltage drop. This further increases the current flowing through the TRIAC junction, which causes an even larger voltage drop across the TRIAC. This chain reaction quickly increases the current in the TRIAC to a level determined by the amount of positive feedback and then switches the circuit “on”. Similarly, when a negative voltage is applied to the gate, the current through the TRIAC junction decreases and switches the circuit “off”.

In summary, CQ220-8MFP is a high-power, low-voltage three-terminal TRIAC, which is used to control current in AC circuits. It is mainly used in switched-mode power supplies, active filter circuits, and power amplifiers. The working principle of CQ220-8MFP is based on the concept of positive feedback and it is able to switch the circuit “on” or “off” quickly with a range of trigger currents.

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