FAN7346 View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN7346

4-Channel LED Current Balance Controller

Fairchild Semiconductor 

May 2011

FAN7346

4-Channel LED Current Balance Controller

Features

 Linear Balance Control for 4-Channel LED Arrays

 Wide LED String Voltage Range:  100V

 Wide VCC Voltage: 10.5V to 35V

 External Linear Regulation Switch: MOSFET or BJT

 Internal Voltage Regulator for Feedback

 Monitoring Drain-Source Voltage of External Switch

 Precision Current Accuracy Trimmed to 1.5%

 Supports External PWM Dimming - Positive

 Supports Wide Dimming Ratio: 0.5%~100%

 Adaptive Linear Regulation Method

 Generate Integrated Feedback Signal for Primary

Controller (Current Feedback + PWM Dimming)

 High Efficiency by Primary Side Direct Feedback

 Thermal Shutdown (Auto-Recovery)

 Over-Voltage Regulation

 Channel Individual Open-LED Protection

 Channel Individual Short-LED Protection

 Channel Individual Over-Current Protection

 Error Flag Output

 28-Pin SOIC

Applications

 LED BLU for LCD TV

 LED BLU for LCD Monitor

 LED Lighting

Description

The FAN7346 is an LED current-balance controller that

controls 4-LED arrays to maintain equal LED current.

The FAN7346 has a high withstanding voltage, so is

suitable for edge-type LED BLU and LED Lighting. To

minimize components between primary to secondary, the

FAN7346 generates a new integrated feedback signal.

The FAN7346 provides various protections, such as

over-voltage regulation, open-LED protection, thermal

protection, and drain-source voltage protection of

regulating switch (the FAN7346 monitors all LED arrays

drain-source voltage for protection). To increase system

reliability, FAN7346 applies individual string protection.

Because FAN7346 integrates so many functions it

reduces overall BOM costs.

LED brightness can be linearly varied up to LED current

by applying an external Pulse Width Modulated (PWM)

signal to the PWM pin.

The FAN7346 is available in a 28-SOIC package.

Ordering Information

Part Number

Operating

Temperature

FAN7346M

FAN7346MX

-40 to +125°C

Package

Packing Method

28-Lead, Small-Outline Integrated Circuit (SOIC)

Rail

Tape & Reel

© 2011 Fairchild Semiconductor Corporation

FAN7346 • 1.0.0

www.fairchildsemi.com

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