HV9982

HV9982 Three-Channel, Closed-Loop, Switch Mode LED Driver IC Features ► Switch mode controller for single-switch converters ► Closed loop control of output current ♦ Buck ♦ Boost ♦ SEPIC ► High PWM dimming ratio ► Internal 40V linear regulator www.DataSheet4U.com ► Constant frequency operation ► Programmable slope compensation ► Linear and PWM dimming ► +0.2A/-0.4A gate drives for the switching FETs ► Output short circuit protection ► Output over voltage protection ► Hiccup mode protection ► Analog control of PWM dimming General Description The HV9982 is a three-channel, closed loop, peak current mode PWM controller for driving a constant output current. It can be used for driving either RGB LEDs or multiple channels of white LEDs. The HV9982 includes a 40V linear regulator which provides an 8.0V supply to power the IC. The switching frequencies of the three converters are controlled by an external clock signal. The channels operate at a switching frequency of 1/12th of the external clock frequency to minimize 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 help to disconnect the input in case of an output short circuit condition. HV9982 includes a hiccup mode protection for both open LED and short circuit condition with automa...