[Supertex inc.]

General Description
TheHV9910C is an open loop, current mode, control LED driver IC. The HV9910C can be programmed to operate in either a constant frequency or constant off-time mode. It includes a
15 – 450V linear regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply. HV9910C includes a TTL compatible PWM dimming input that can accept an external control signal with a duty ratio of 0 – 100% and a frequency of up to a few kilohertz. It also includes a 0 – 250mV linear dimming input which can be used for linear dimming of the LED current. As opposed to the HV9910B, the HV9910C is equipped with built-in thermal shutdown protection.

FEATUREs
►Switchmode controller for single switch LEDdrivers
►Enhanced drop-in replacement to the HV9910B
►Open loop peak current controller
►Internal 15 to 450V linear regulator
►Constant frequency or constant off-time operation
►Linear and PWM dimming capability
►Requires few external components for operation
►Over-temperature protection