MICROCHIP HV9910CSG-G

HV9910C is an open-loop, current-mode control, LED driver IC. This IC 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 with 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 - 250 mV linear-dimming input which can be used for linear dimming of the LED current. Unlike the HV9910B, the HV9910C is equipped with built-in thermal-shutdown protection.

HV9910C is ideally suited for buck LED drivers. Since the HV9910C operates in open-loop current mode control, the controller achieves good output current regulation without the need for any loop compensation. Also, being an open-loop controller, PWM-dimming response is limited only by the rate of rise of the inductor 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.

• Switch Mode Controller for Single Switch LED Drivers
• 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

• DC/DC or AC/DC LED Driver Applications
• RGB Back-Lighting LED Driver
• Back Lighting of Flat Panel Displays
• General Purpose Constant Current Source
• Signage and Decorative LED Lighting
• Chargers