L6008R6

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Thyristors - TRIACs

A triac is a three-terminal AC switch (thyristor), designed to regulate current flow in both directions. The L6008R6 is a mid-range TRIAC, suitable for a variety of applications. This article will discuss the application field of the L6008R6, as well as its working principle.

Application Field of the L6008R6

The L6008R6 TRIAC is suitable for light dimming and motor speed control. It is often used in small home appliances such as fans and air conditioners, as well as fluorescent light ballasts. It can also be used in power supplies, in conjunction with transformers, input filters, and control circuits.

The L6008R6 is designed to control currents up to 650W, in a single phase AC circuit. Its surge rating is 7.5A, and its maximum RMS current rating is 4A. Its maximum on-state voltage drop is 2.25V, and its maximum gate trigger current is 15mA. It is available in a TO-92 package, with a maximum junction temperature of 125°C.

Working Principle of the L6008R6

The L6008R6 is a three-terminal AC switch, designed to control current flow in both directions. When an appropriate AC voltage is applied to its gate terminal, it will become “on”, allowing current to flow through it. When the gate voltage is removed, the L6008R6 will switch “off”, and stop conducting current.

The L6008R6 has two operating modes: random-phase-angle control and fixed-phase-angle control. In the fixed-phase-angle mode, the trigger voltage threshold is adjustable. This allows the user to adjust the firing angle of the TRIAC. The current regulation levels are also adjustable, and can be adjusted in the range of 0-1A.

The gate circuit of the L6008R6 includes a resistor, capacitor, and diode. The resistor and capacitor are used to form a noise filter, while the diode acts as a protection mechanism. When the gate voltage is lowered, the diode will conduct current, bypassing the TRIAC and protecting it from damage.

Conclusion

The L6008R6 is a mid-range TRIAC, providing reliable current regulation for AC circuits. It is suited for light dimming and motor speed control, and is often used in home appliances, ballasts, and power supplies. Its working principle relies on a variable trigger voltage threshold, a noise filter, and a protection diode. This TRIAC can handle currents up to 650W, and is available in a TO-92 package.

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