FAN7547A LCD Backlight Inverter Drive IC
February 2007
FAN7547A LCD Backlight Inverter Drive IC
Features
Backlight L...
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 ...