General Description

The HV9911 is a current mode control LED driver IC designed to control single switch PWM converters (buck, boost or buck-boost), 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 case of buck and buck-boost converters, the high side output current can be sensed by using the HV7800).

Features

 Switch mode controller for single switch drivers

  o Buck

  o Boost

  o Buck-boost

 Works with high side current sensing

 Closed loop control of output current

 High PWM dimming ratio

 Internal 9 to 250V linear regulator (can be extended using external zener diodes)

 Internal 2% Voltage Reference (-40°C  Constant frequency or constant off-time operation

 Programmable slope compensation

 Enable & PWM dimming

 +0.25A/-0.5A gate drive (VDD = 10V)

 Output short circuit protection

 Output over voltage protection

 Synchronization capability

 Programmable MOSFET current limit

 Soft start

Applications

 RGB backlight applications

 Automotive LED driver application

 Battery Powered LED lamps

 Other DC/DC LED drivers