HV9910C Universal High-Brightness LED Driver Features Description HV9910C is an open-loop, current-mode control, LED Switch mode controller for single switch LED drivers driver IC. This IC can be programmed to operate in Enhanced drop-in replacement to the HV9910B either a constant frequency or constant off-time mode. Open loop peak current controller It includes a 15 450V linear regulator which allows it Internal 15 to 450V linear regulator to work with a wide range of input voltages without the Constant frequency or constant off-time operation need for an external low voltage supply. HV9910C includes a TTL-compatible, PWM-dimming input that Linear and PWM dimming capability can accept an external control signal with a duty ratio Requires few external components for operation of 0 100% and a frequency of up to a few kilohertz. It Over-temperature protection also includes a 0 250mV linear-dimming input which can be used for linear dimming of the LED current. Applications Unlike the HV9910B, the HV9910C is equipped with built-in thermal-shutdown protection. DC/DC or AC/DC LED driver applications HV9910C is ideally suited for buck LED drivers. Since RGB back-lighting LED driver the HV9910C operates in open-loop current mode con- Back lighting of flat panel displays trol, the controller achieves good output current regula- General purpose constant current source tion without the need for any loop compensation. Also, Signage and decorative LED lighting being an open-loop controller, PWM-dimming Chargers response is limited only by the rate of rise of the induc- tor current, enabling a very fast rise and fall times of the LED current. HV9910C requires only three external components (apart from the power stage) to produce a controlled LED current. This makes HV9910C an ideal solution for low-cost LED drivers. 2014 Microchip Technology Inc. DS20005323A-page 1HV9910C TO OUR VALUED CUSTOMERS It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and enhanced as new volumes and updates are introduced. If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via E-mail at docerrors microchip.com. We welcome your feedback. Most Current Data Sheet To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at: