HV9967B中文资料Integrated LED Driver w/ Average-Mode Current Control数据手册Microchip规格书

描述 Description

The HV9967B is an average-mode current control LED driver IC operating in a constant off-time mode.The IC features an integrated 60V, 0.8Ω MOSFET that can be used as a stand-alone buck converter switch, or connected as a source driver for driving an external high-voltage depletion-mode MOSFET. The HV9967B is powered through its switching output when the integrated switch is off. Hence, the same external MOSFET can be used as a high-voltage linear regulator for powering the IC.The LED current is programmed with one external resistor. The average-mode current control method does not produce a peak-to-average error, and therefore greatly improves current accuracy and line and load regulation of the LED current without any need for loop compensation or direct sensing of the LED current at a high-voltage potential. The auto-zero circuit cancels the effects of the input offset voltage and of the propagation delay of the current sense comparator.

特性 Features

• 3% accurate LED current
• Integrated 60V, 0.8Ω MOSFET
• Low sensitivity to external component variation
• Single resistor LED current setting
• Fixed off-time control
• PWM dimming input
• Output short circuit protection with skip mode
• Over-temperature protection
• Available in compact 8-Lead MSOP and 8-Lead DFN packages

简介

HV9967B属于集成电路（IC）的LED驱动器。由Microchip制造生产的HV9967BLED 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。