L4004V6 application field and working principle

The L4004V6 is a 3-terminal silicon bidirectional avalanche triac, designed to be connected directly to the mains. The device is suitable for applications where the line frequency is up to 400 Hz. As a Bidirectional TRIAC, it is mainly used for full-wave digital switching and phase control applications.

Principle of Operation

The L4004V6 is a normally-off thyristor with a two-terminal triggering gate. When a gate current is applied, the thyristor starts to conduct current only in one direction, allowing full-wave switching. The TRIAC remains in the ON state as long as a minimum current flows at the anode. This is referred to as latching. When current at the anode drops to zero, the thyristor automatically turns OFF.

Applications

The L4004V6 can be used in a variety of applications including full-wave digital switching, ON-OFF time control, dimming control, motor speed control, and phase control. In addition, this device can be used as a full-wave rectifier in AC-DC power supplies, as well as for AC power switching.

Features

The L4004V6 has a bidirectional blocking capability of 400V and consumes only 1mA latching current. The circuit contains an integrated avalanche suppressor for enhanced protection. In addition, the design of the device allows for the elimination of a snubber circuit in the application circuit, which reduces overall system cost. The device also has a low turn-on voltage of 2.5V and a very low AC input impedance. It is suitable for both commercial and automotive applications.

Conclusion

The L4004V6 is a 3-terminal, bidirectional thyristor designed for full-wave digital switching and phase control applications. It allows for high-speed switching, with a low turn-on voltage and a blocking capability up to 400V. The device provides excellent reliability and enhanced protection, while eliminating the need for a snubber circuit. The device is suitable for commercial and automotive applications.