TLHE4200

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The TLHE4200 from Texas Instruments is a light-emitting diode (LED) indicator designed for discrete applications. This component can operate in various ways, depending on the chosen application. Generally, it can be used in a variety of display functions, including in-rush indicators and dial control indicators. In terms of performance, the TLHE4200 is capable of delivering a wide range of luminous intensities, with a maximum luminous intensity of up to 450mcd at 10mA peak drive current. It also offers high accuracy in brightness consistency. Its 4-pin terminal brings additional flexibility to the interface, allowing connection to a wider range of power sources. In this article, we provide a brief overview of the TLHE4200’s application field and working principle.

Application Field

The TLHE4200 is designed for discrete applications, such as:

• • Illuminating in-rush indicators.
• • Displaying audio level.
• • Indicating thermostatic conditions.
• • Dial control indicators.
• • LED spotlights.
• • LED status indications.
• • Decorative or special effects lighting.

The component is highly versatile, since it can be mounted on most existing circuit boards, as well as on CMOS and ASIC components. Additionally, it can be connected to a wide range of power supplies, increasing its possible applications even more.

Working Principle

The TLHE4200 works in a simple way. The LED, in short, responds to the amount of current that passes through it; the LED’s intensity varies depending on the type of current and the magnitude of the current. When the current is on, the LED will emit light, and when the current is off, the LED will be off. The TLHE4200 is designed to be driven by an alternating current, and it has four pins. The anode and cathode, they represent the positive and negative connections to the LED. The third pin is labeled Vo. This is the voltage control pin, and it determines the amount of current flowing through the LED. The fourth pin is the ground pin, and it provides a reference voltage for the other three pins.

Generally speaking, the working principle is simple. When an alternating current is applied to the three pins of the LED, the internal electrical circuit causes some of the electrons to be energized and jump from one side of the LED to the other, creating a phenomenon called electroluminescence. This phenomenon is what causes the LED to emit light.

Conclusion

In conclusion, the TLHE4200 from Texas Instruments is an excellent choice for discrete applications. Its 4-pin terminal allows for flexibility in connecting with various power supplies, while its wide range of intensities ensures strong and long-lasting illumination. The principle of operation is also simple and straightforward. Thanks to these features, this component can be applied in a variety of inspiring and practical applications.

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