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FAN7547A

Fairchild Semiconductor
Part Number FAN7547A
Manufacturer Fairchild Semiconductor
Description LCD Backlight Inverter Drive IC
Published May 3, 2007
Detailed Description FAN7547A LCD Backlight Inverter Drive IC February 2007 FAN7547A LCD Backlight Inverter Drive IC Features „ Backlight L...
Datasheet PDF File FAN7547A PDF File

FAN7547A
FAN7547A

Overview
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 2V Comparator6 50kΩ Vms 50kΩ 1V Full Lighting when VDS = 3V FAN7547A Rev.
1.
01 GND Figure 1.
Functional Block Diagram of FAN7547A © 2005 Fairchild Semiconductor Corporation FAN7547A Rev.
1.
0.
3 2 www.
fairchildsemi.
com FAN7547A LCD Backlight Inverter Drive IC Pin Configuration OUT 14 VCC1 13 VCC 12 OSC 11 S/S 10 COMP 9 FB 8 FAN7545A 1 GND 2 VDS 3 Vref 4 Vms 5 RCT 6 OLP 7 SDP FAN7547A Rev.
1.
00 Figure 2.
Pin Configuration (Top View) Pin Definitions Pin # 1 2 3 4 5 6 7 8 9 10 11 1...


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