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May 2011
FAN7346
4-Channel LED Current Balance Controller
Features
Description
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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
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.
Applications
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LED BLU for LCD TV
LED BLU for LCD Monitor
LED Lighting
Ordering Information
Part Number
FAN7346M
FAN7346MX
Operating
Temperature
-40 to +125°C
Package
28-Lead, Small-Outline Integrated Circuit (SOIC)
Packing Method
Rail
Tape & Reel
? 2011 Fairchild Semiconductor Corporation
FAN7346 ? 1.0.0
www.fairchildsemi.com
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