FAN7346 Datasheet, PDF (1/19 Pages) Fairchild Semiconductor – 4-Channel LED Current Balance Controller

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 V_CC 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