HV9963中文资料Closed Loop LED Driver w/ Enhanced PWM Dimming数据手册Microchip规格书

描述 Description

The HV9963 is a current mode control LED driver IC designed to control single switch PWM converters (buck, boost, buck-boost or SEPIC) in a constant frequency mode. The controller uses a peak current-mode control scheme (with programmable slope compensation) and includes an internal transconductance amplifier to accurately control the output current over all line and load conditions. Multiple HV9963s can be synchronized to each other or to an external clock using the SYNC pin. The IC also provides a disconnect switch gate drive output, which can be used to disconnect the LEDs in case of a fault condition using an external disconnect FET. The 10V external FET drivers allow the use of standard level FETs. The low voltage 5.0V AVDD is used to power the internal logic and also acts as a reference voltage to set the current level.The HV9963 includes an enhanced PWM dimming logic (patent pending) that enables very high PWM dimming ratios.The HV9963 also provides a TTL compatible, low-frequency PWM dimming input that can accept an external control signal with a duty ratio of 0-100% and a frequency of up to a few tens of kilohertz.

特性 Features

Buck
Boost
Buck-boost and SEPIC
High output current accuracy
High PWM dimming ratio (>5000:1)
Internal 40V linear regulator
Internal ±2% voltage reference
Constant frequency operation with sync capability
Programmable soft start
10V GATE drivers
Hiccup mode protection for both short circuit and open circuit conditions

简介

HV9963属于集成电路（IC）的LED驱动器。由Microchip制造生产的HV9963LED 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。