HV9985数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The HV9985 is a three-channel peak current mode PWM controller for driving single switch converters in a constant output current mode. It can be used for driving either RGB LEDs or multiple channels of white LEDs.The HV9985 features a 40V linear regulator, which provides a 5.0V supply to power the IC. The switching frequencies of the three converters in the IC are controlled either with an external clock signal (the channels operate at a switching frequency of 1/12th of the external clock frequency) or using the internal oscillator. The three channels are positioned 120° out-of-phase to reduce the input current ripple. Each converter is driven by a peak current mode controller with output current feedback.The three output currents can be individually dimmed using either linear or PWM dimming. The IC also includes three disconnect FET drivers which enable high PWM dimming ratios and also helps to disconnect the input in case of an output short circuit condition. The HV9985 includes hiccup mode protection for both open LED and short circuit condition to prevent the IC from shutting down in the case of intermittent faults.

特性 Features

Switch mode controller for single-switch converters
0.25A sourcing
0.5A sinking
Typical ±2% absolute and string-to-string current accuracy (with ±1% sense resistors)
High PWM dimming ratio up to 5000:1
10-40V input range
Constant frequency operation up to 1.0MHz
On-chip clock or external clock option
Programmable slope compensation
Linear and PWM dimming
Output short circuit protection
Output over voltage protection
Hiccup mode protection

简介

HV9985属于集成电路（IC）的LED驱动器。由制造生产的HV9985LED 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。