FAN7547A

FAN7547A LCD Backlight Inverter Drive IC February 2007 FAN7547A LCD Backlight Inverter Drive IC Features „ Backlight Lamp Ballast and Soft Dimming „ Reduced Number of Components „ Wide Range of Operating Voltage (6 to 30V) „ Precision Voltage Reference Reduced to 3.4% „ Low Standby Current (Typically 50µA) „ Soft-Start Function „ PWM Control „ Analog, Mixed, and PWM Dimming Function „ P-Channel MOSFET Drive „ Open-Lamp Protections (OLP) „ Shutdown Protections (SDP) „ 14-Pin SOP Description The FAN7547A provides all control functions for a current-fed, push-pull, self-oscillation type converter and also contains a pulse-width-modulated (PWM) controller to develop a supply voltage. Typical operating frequency range is from 30kHz to 100kHz, depending on the cold cathode fluorescent lamp (CCFL) and the transformer's characteristics. 14-SOP www.DataSheet4U.com Ordering Information Part Number FAN7547AM FAN7547AMX Package 14-SOP Pb-Free Yes Operating Temperature Range Packing Method -25°C ~ +85°C Tube Tape & Reel © 2005 Fairchild Semiconductor Corporation FAN7547A Rev. 1.0.3 www.fairchildsemi.com FAN7547A LCD Backlight Inverter Drive IC Internal Block Diagram OUT VZ SW Vref 3V VZ VCC Comparator1 UVLO 5V S/S 1.3V RCT Oscillator 120μA Vb 7V Comparator4 Va Comparator5 Vref Vref 0.1V Comparator3 VCC 40μA Comparator2 Internal Bias VCC1 Vref Output Driver Q R S 2μA SDP 3.7V OSC COMP FB Buffer Amplifier OLP Dimming Control and Mode Selection Block VDS Analog PWM Mixed ...