THL3514-B

The THL3514-B is an integrated circuit that control the current loop of light-emitting diodes (LEDs) and supports real-time, independent current control of each individual LED. It is a part of a range of integrated power management ICs (PMICs) specifically developed for LED drivers. This device is frequently used in many consumer electronic applications, such as television sets and digital video displays.

Applications: The THL3514-B is designed for consumer electronics applications that require efficient, low-power LED drivers, such as: TVs, digital video displays, portable digital devices, digital cameras, navigational systems, monitors, projectors, and printers. The device offers a wide range of current control and dimming functions, making it amenable to a variety of LED lighting applications.

Working Principle: The THL3514-B utilizes a constant voltage architecture to drive a constant-current regulated LED string. The device contains an inductor, a linear regulator and a dynamic feedback loop, which enables it to sense and compensate against changes in LED current, providing dynamic control over the LED current while optimizing efficiency. The inductor prevents the DC current from fluctuating and also reduces noise. The linear regulator also helps in ensuring constant-current operation and stabilizing the voltage applied to the LED string.

The current output is regulated by an external sense-resistor, and can be controlled with an external signal, such as an analog voltage or PWM signal. Additionally, the device is capable of operating in burst mode, which reduces total power consumption, especially at low drive currents. The THL3514-B also supports a wide variety of dimming modes, making it well-suited for controlling the brightness of LED strings in applications such as displays, backlighting and general lighting.

In summary, the THL3514-B is an efficient, integrated circuit that provides a cost-effective solution for controlling LED current. It offers robust current-regulation, dynamic control and dimming capabilities while maintaining high efficiency. This makes it an ideal choice for illuminating a variety of consumer electronics applications.