Supertex has introduced a new three-channel LED driver IC designed to provide high LED current accuracy through closed loop control of the output currents. It is designed for applications using RGB LED backlighting or multiple strings of white LEDs. The HV9982 employs a fixed frequency, closed-loop, current mode control architecture that ensures stable operation over a wide range of input and output voltages. Its high-side current sensing allows it to be used in buck, boost or SEPIC configurations while delivering ±1% current accuracy between strings. The IC utilises an internal control with an external clock source to facilitate synchronisation. Each channel of the HV9982 can drive an LED string of up to 200 V, with efficiency greater than 90%. The output current range of each channel is user-programmable with an external sense resistor and can be individually dimmed using either linear or PWM dimming. Three built-in disconnect FET drivers enable high PWM dimming ratios. Programmable slope compensation allows for synchronisation and a greater than 50% duty cycle in fixed frequency operation. The IC also includes hiccup mode protection for both open LED and short circuit conditions.
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