HV9925中文资料Programmable-Current LED Lamp Driver w/PWM Dimming数据手册Microchip规格书

描述 Description

The HV9925 is a pulse width modulated (PWM) high-efficiency LED driver control IC with PWM dimming capabilities. It allows efficient operation of high brightness LED strings from voltage sources ranging up to 400VDC. The HV9925 includes an internal high-voltage switching MOSFET controlled with a fixed off-time (TOFF) of approximately 10.5µs. The LED string is driven at constant current, thus providing constant light output and enhanced reliability. Selecting a value of a current sense resistor can externally program the output LED current of the HV9925.The peak current control scheme provides good regulation of the output current throughout the universal AC line voltage range of 85 to 264VAC or DC input voltage of 20 to 400V. The HV9925 is designed with a built in thermal shutdown to prevent excessive power dissipation in the IC.

特性 Features

Programmable output current to 50mA
PWM dimming / enable
Universal 85 - 264VAC operation
Fixed off-time buck converter
Internal 475V power MOSFET
Over-temperature protection with hysteresis

简介

HV9925属于集成电路（IC）的LED驱动器。由制造生产的HV9925LED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。