General Description

The HV9803B is an open loop average-mode current control LED driver IC operating in a constant off-time mode. The IC features ±2 current accuracy, tight line and load regulation of the LED current without any need for loop compensation or high-side current sensing. Its auto-zero circuit cancels the effect of both the input offset voltage and the propagation delay in the current sense comparator.

Features

► Fast average current control

► Correction for propagation delay and offset voltage

► Fixed off-time switching mode

► Linear dimming input

► PWM dimming input

► Output short circuit protection with programmable skip mode

► Input under-voltage shutdown

Applications

► Backlighting of LCD Panels

► General Lighting