TLWR8903

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LEDs are some of the most used components in circuit boards ranging from highly automated systems to simple prototyping projects. A TLWR8903 from the well-known manufacturer Tower Semiconductors is a part of the discrete LED indication family that acts as a constant current source for controlling the brightness level in various types of LEDs. This article will explore the application field of the TLWR8903 and its working principle.

LED Indication - Discrete

A discrete LED indication device is a type of optoelectronic component which lights up when connected to an electrical current. Generally, discrete LEDs can be used for lighting up indicators for low-voltage systems, providing power-saving illumination for night driving, or in various industrial warning signalling applications.

The TLWR8903 is one such discrete LED indicator device. It is an efficient current source with a wide range of capabilities. The device can be configured as a linear current regulator, a PWM controller or a dimmer. It is designed to deliver constant current to drive up to 4 LEDs in any circuit configuration. The device enables the use of constant current to ensure the consistent brightness of LEDs over the entire operating range.

Applications of TLWR8903

The TLWR8903 is a versatile LED indication device that can be used in a variety of applications. One of its primary uses is in automotive applications, where it is used to control LED indicators that show the operation and status of various vehicle systems. The device can be used to create glowing LEDs that remain a consistent brightness level even in changing temperature environments, allowing for an improved visual indication inside vehicles.

The device can also be used in industrial applications such as indicating warning lights, indicating proximity of hazardous areas, or as a control and feedback mechanism in various mechanical systems. Its adjustable current source allows for multiple LED configurations, like single LED lighting control, two LED lighting control, three LED lighting control and four LED lighting control, for various high power LED designs.

Working Principle

The TLWR8903 is a sophisticated electronic device that integrates an internal power MOSFET with dual current sources and voltage loop control to regulate the current delivered to the LED. It works by providing one low-side constant current source and one common current source, which can be used to provide separate fine control of the brightness of each LED element. The device also has a voltage loop control system that monitors the voltage at the terminal of the current source and adjusts the current output accordingly.

The built-in power MOSFET of the device is used to drive and regulate the current flow in the LED circuit. The device also ensures that the LED is working at a safe power level, to protect it from over-current and from the danger of overheating. With its integrated heat management features, the device offers improved reliability and longer-term performance.

Conclusion

The TLWR8903 from Tower Semiconductors is an efficient LED indication device that is designed to provide a constant current source for driving up to 4 LED elements. It has an integrated power MOSFET with dual current sources and voltage loop control that adjusts the current output to match the LED requirements. The device is intended for a wide range of applications, including automotive and industrial applications.

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