The HV9986 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 HV9986 features a 40V linear regulator, which provides a 5V 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 includes three disconnect FET drivers which enable high PWM dimming ratios, as well as to help disconnect the output in case of an output short circuit condition. HV9986 includes independent fault control for each of the channels so that a fault condition in one channel will not affect the performance of the other two. It also includes three open drain fault indicator outputs which can be used by the controlling microprocessor to reset the channel.
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)