The HV857MG is a high-voltage LED driver IC from Supertex, Inc., designed for driving LED lamps and displays. It is a highly integrated solution that simplifies the design of LED lighting systems, offering features such as PWM dimming, overvoltage protection, and overtemperature protection. The HV857MG is suitable for a wide range of LED lighting applications, including LED bulbs, LED tubes, and LED displays.

Applications:

• LED bulbs and lamps: Used in LED replacement lamps for residential and commercial lighting.
• LED tubes: Drives LEDs in linear lighting applications.
• LED displays: Powers LEDs in signage and display panels.
• Architectural lighting: Integrated into architectural lighting systems for efficient and controlled illumination.
• Backlighting: Used as a backlight driver for LCD displays.

Features:

• High voltage operation: Operates with high voltage inputs, suitable for off-line LED driving.
• PWM dimming: Allows for precise control of LED brightness.
• Overvoltage protection: Protects the LED driver and LEDs from overvoltage conditions.
• Overtemperature protection: Shuts down the driver in case of excessive temperature, preventing damage.
• Open-circuit protection: Protects the driver from open-circuit conditions.
• Short-circuit protection: Protects the driver and LEDs from short-circuit conditions.

Benefits:

• Simplified design: High integration simplifies the design of LED lighting systems.
• Precise brightness control: PWM dimming allows for fine-tuning of LED brightness.
• Robust protection features: Protects the LED driver and LEDs from various fault conditions, improving system reliability.
• Energy efficient: High efficiency minimizes power consumption.

Additional Details:

The HV857MG utilizes a constant-current control scheme, ensuring consistent LED brightness over a wide range of input voltages. The device is available in a small surface-mount package, suitable for automated assembly. The HV857MG requires a minimum number of external components for operation. The PWM dimming input is compatible with standard CMOS logic levels. This LED driver provides a reliable and efficient solution for driving LEDs in various lighting applications, offering comprehensive protection and precise control. It can operate in buck, boost, or buck-boost configurations depending on the application requirements.