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This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN7346 4-Channel LED Current Balance Controller May 2011 FAN7346 4-Channel LED Current Balance Controller Features Description Linear Balance Control for 4-Channel LED Arrays The FAN7346 is an LED current-balance controller that Wide LED String Voltage Range: 100V controls 4-LED arrays to maintain equal LED current. Wide V Voltage: 10.5V to 35V CC The FAN7346 has a high withstanding voltage, so is External Linear Regulation Switch: MOSFET or BJT suitable for edge-type LED BLU and LED Lighting. To Internal Voltage Regulator for Feedback minimize components between primary to secondary, the FAN7346 generates a new integrated feedback signal. Monitoring Drain-Source Voltage of External Switch Precision Current Accuracy Trimmed to 1.5% The FAN7346 provides various protections, such as over-voltage regulation, open-LED protection, thermal Supports External PWM Dimming - Positive protection, and drain-source voltage protection of Supports Wide Dimming Ratio: 0.5%~100% regulating switch (the FAN7346 monitors all LED arrays Adaptive Linear Regulation Method drain-source voltage for protection). To increase system Generate Integrated Feedback Signal for Primary reliability, FAN7346 applies individual string protection. Controller (Current Feedback + PWM Dimming) Because FAN7346 integrates so many functions it reduces overall BOM costs. High Efficiency by Primary Side Direct Feedback Thermal Shutdown (Auto-Recovery) LED brightness can be linearly varied up to LED current Over-Voltage Regulation by applying an external Pulse Width Modulated (PWM) signal to the PWM pin. Channel Individual Open-LED Protection Channel Individual Short-LED Protection The FAN7346 is available in a 28-SOIC package. Channel Individual Over-Current Protection Error Flag Output 28-Pin SOIC Applications LED BLU for LCD TV LED BLU for LCD Monitor LED Lighting Ordering Information Operating Part Number Package Packing Method Temperature FAN7346M Rail -40 to +125C 28-Lead, Small-Outline Integrated Circuit (SOIC) FAN7346MX Tape & Reel 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7346 1.0.0