HV9989数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The HV9989 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 HV9989 featuresproprietary PWM dimming control algorithm achieving a dimming pulse of a few hundred nanoseconds from a continuous-conduction mode (CCM) or discontinuous-conduction mode (DCM) boost converter, while maintaining the instantaneous LED constant current determined by the external reference voltage input. This feature permits dimming frequency outside of the audible range. The feature can also yield a wide dimming ratio in excess of 10,000:1 at low dimming frequency. Each of the three channels features individual PWM dimming and reference voltage inputs.The switching frequencies of the three converters are controlled by an external clock signal, such that the channels operate at a switching frequency of 1/12th the external clock frequency and are positioned 120O out-of-phase to reduce the input current ripple. The HV9989 provides a full protection feature set, including output-short and open-circuit protection, for each individual channel that is independent from the other channels. The HV9989 is powered by a built-in 40V linear regulator.

特性 Features

• Three out-of-phase constant-current boost converters
• Current loop closed with sub-microsecond PWM dimming pulses supports PWM dimming >20kHz
• Internal 40V linear regulator
• External clock input
• External individual reference inputs
• Individual PWM dimming inputs
• Programmable slope compensation
• +0.2A/-0.4A gate drivers
• Independent short circuit protection with hiccup for each channel
• Latching output open-circuit protection

简介

HV9989属于集成电路（IC）的LED驱动器。由制造生产的HV9989LED 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。