FP7176

LED Driver with Average-Mode Constant Current Control

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Rev. 0.64

1/14

General Description

The FP7176 is an average current mode control LED driver IC operating in a constant off-time

mode. FP7176 does not produce a peak-to-average error, and therefore greatly improves accuracy,

line and load regulation of the LED current without any need for loop compensation or high-side

current sensing. The output LED current accuracy is ±2%.

The FP7176 can be powered from an 8.0 - 450V supply. A PWM dimming input is provided that

accepts an external control TTL compatible signal. The output current can be programmed by an

internal 277mV reference, or controlled externally through a 0 - 1.5V dimming input.

Features

 Fast average current control

 Internal 8 to 450V linear regulator

 Programmable constant off-time switching

 Linear and PWM dimming capability

 Output short circuit protection with skip mode

 Requires few external components for operation

Applications

 DC/DC or AC/DC LED driver applications

 LED street lighting

 Back lighting of flat panel displays

 General purpose constant current source

 Signage and decorative LED lighting

 Chargers

Typical Application Circuit

PWMD

VDD

LD

RT

VIN

CS

GND

GATE

FP7176

Linear

Dimming

PWM

Dimming

VIN

LED

Load