Open-loop current-mode control LED driver IC can be programmed

The Microchip HV9910B open-loop current-mode, control LED driver IC is now available from RS Components. The device can be programmed to operate in either a constant frequency or constant off-time mode. It includes an 8V - 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.