TLC5928RGET

PMIC - LED Drivers

The TLC5928RGET is an integrated power management integrated circuit (PMIC) specifically designed for directly driving LEDs, going beyond a simple LED driver. It is equipped with integrated power converters and power switches, which are configured to achieve the highest level of efficiency and to minimize the number of external components required for a given design.

Application Field

TLC5928RGET is primarily used for dimming LEDs, which makes it ideal for a variety of applications, from automotive systems such as headlamps, to architectural and industrial lighting systems, to backlighting for flat panel displays. The device is also widely used for general-purpose display, signage, and indicator lighting.

The device supports direct PWM dimming, enabling designers to easily vary current to the LEDs to change their brightness level. The device also supports long-term, highly reliable operation with Automotive Grade 2 qualification. This makes it ideal for harsh applications like automotive, as well as industrial or outdoor lighting.

The TLC5928RGET also provides high system efficiency with fewer components and a high-efficiency architecture. Its integrated regulated switches and power-management circuitry is designed to achieve maximum efficiency even when driving high currents. Its tight regulation and fast transient response makes it an excellent choice for driving LEDs with high output current in high brightness applications.

The device includes a wide range of features not found in a typical LED driver, including built-in operational stability features such as thermal/current monitoring and protection, as well as integrated LED diagnostics, making it easy to integrate this LED driver into a wide range of LED lighting applications.

Working Principle

The TLC5928RGET provides a powerful PMIC that can drive up to seven strings of up to 10 LEDs in parallel. It is built on an efficient architecture that uses a low-voltage input, wide voltage buck and low-side voltage converters to generate higher output currents. The device generates regulated LED current, while still providing thermal/overcurrent protection.

The TLC5928RGET has two operating modes: a “Direct” mode, in which the LED current is set by the external resistor, and a “PWM” mode, in which the LED current is set by external PWM signals. In direct mode, the external resistor determines the LED current and the TLC5928RGET applies voltage to the LEDs until the desired output current is reached. In PWM mode, the TLC5928RGET monitors an external PWM signal to adjust the speed of the switching converter and control the brightness of the LEDs.

The TLC5928RGET also provides a low ripple over the operating range for a smooth, steady light output and an optional open-drain output mode with short circuit protection for fault protection in case of short circuits.

In addition, the device includes a wide array of integrated protection features for enhanced reliability and safe operation. This includes overvoltage protection, overcurrent protection, reverse protection and thermal protection.

The TLC5928RGET is designed to suit a variety of applications and can easily be adapted to the specific requirements of an application. As an integrated PMIC, it helps lower system costs and reduce design time, while providing highly reliable performance in a wide range of LED applications.