AN30888B-VB Integrated Circuits (ICs)

PMIC - LED Drivers are power conversion and management components that regulate, stabilize and control LEDs. These components are a vital element in LED lighting systems due to their ability to affect the brightness, colour and energy draw of the lights. Among these components is the AN30888B-VB, a DC-DC converter for LED lighting applications.

Application Field

The AN30888B-VB is designed for driving white LED backlight units used in LCD panel applications. Its compact size and low operating voltage make it suitable for use in a variety of types of LCD displays, such as small and medium sized LCD monitors, mobile phones and digital cameras. It can also be used in other white LED lighting application areas, such as car illumination, large LCD televisions and home appliances.

Working Principle

The AN30888B-VB is a constant current step-down DC-DC converter with a wide operating voltage range of 5V to 16V. The device uses a dual switching topology that combines an inductor-based buck converter with specialized digital control logic. This enables the device to regulate the LED current to the set levels under all conditions with minimal ripple interference. The device also incorporates frequency modulation, load current and temperature protection to ensure its safe operation.

The AN30888B-VB has a maximum output current up to 1.2A, allowing it to drive up to 6 pieces of series connected white LEDs at a constant current. The device also has an integrated loop compensation circuit and an adjustable output current, which can be set by either external components or an external resistor. This allows the user to optimize the LED current easily.

The device also features a separate enable/disable pin allowing the user to control the switching on or off. This makes the device a great choice for applications where LED control is required but with limited number of components and control signals, such as battery-powered applications. It also features an integrated circuit breaker which limits in-rush current and provides protection from overcurrent events.

Conclusion

The AN30888B-VB is a compact, cost-effective solution for DC-DC LED backlight applications. Its wide operating voltage range and integrated features, such as frequency modulation, load and temperature protection, make it a great choice for smaller applications requiring minimal power consumption and control. Its adjustable output current and separate enable/disable pin allow the user to set up the device with minimal components, making it an ideal choice for tight spaces and battery-powered applications.