The HV9911 is a current mode control LED driver IC designed to control single switch PWM converters (buck, boost, buck-boost, 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 high power applications. An internal 9.0 - 250V linear regulator powers the IC, eliminating the need for a separate power supply for the IC. HV9911 provides 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. The IC also provides a FAULT output which, can be used to disconnect the LEDs in case of a fault condition, using an external disconnect FET.The HV9911 based LED driver is ideal for RGB backlight applications with DC inputs. The HV9911 based LED lamp drivers can achieve efficiency in excess of 90% for buck and boost applications.

  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

  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