HV9985

HV9985 www.DataSheet4U.com Three-Channel, Closed-Loop, Switch Mode LED Driver IC Features ► Switch mode controller for single-switch converters ► Gate drivers optimized for driving Logic Level FETs ♦ 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 General 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 ena...