General Description
The HV9910B is an open loop, current mode, control LED driver IC. The HV9910B can be programmed to operate in either a constant frequency or constant off-time mode. It includes an 8.0 - 450V linear regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply. The HV9910B includes a 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.

Features
► Switch mode controller for single switch LED drivers
► Enhanced drop-in replacement to the HV9910
► Open loop peak current controller
► Internal 8.0 to 450V linear regulator
► Constant frequency or constant off-time operation
► Linear and PWM dimming capability
► Requires few external components for operation

Applications
► DC/DC or AC/DC LED driver applications
► RGB backlighting LED driver
► Back lighting of fl at panel displays
► General purpose constant current source
► Signage and decorative LED lighting
► Chargers