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