HV9911

HV9911 Switch-Mode LED Driver IC with High Current Accuracy Features ► Switch mode controller for single switch drivers ♦ Buck ♦ Boost ♦ Buck-boost ♦ SEPIC ► Works with high side current sensing ► Closed loop control of output current ► High PWM dimming ratio ► Internal 250V linear regulator (can be extended using external Zener diodes) ► Internal 2% voltage reference (0°C < TA < 85°C) ► Constant frequency or constant off-time operation ► Programmable slope compensation ► Enable & PWM dimming ► +0.2A/-0.4A GATE drive ► Output short circuit protection ► Output over voltage protection ► Synchronization capability ► Programmable MOSFET current limit Applications ► RGB backlight applications ► Battery powered LED lamps ► Other DC/DC LED drivers General Description The HV9911 is a current mode control LED driver IC designed to control single switch PWM converters (buck, boost, buckboost, or SEPIC), in a constant frequency or constant off-time mode. The controller uses a peak current control scheme, (with programmable slope compensation), and includes an internal transconductance amplifier to control the output current in closed loop, enabling high output current accuracy. In the constant frequency mode, multiple HV9911s can be synchronized to each other, or to an external clock, using the SYNC pin. Programmable MOSFET current limit enables current limiting during input under voltage and output overload conditions. The IC also includes a 0.2A source and 0.4A sink GATE driver for ...