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Fairchild Semiconductor Electronic Components Datasheet

FAN7547A Datasheet

LCD Backlight Inverter Drive IC

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FAN7547A pdf
FAN7547A
LCD Backlight Inverter Drive IC
February 2007
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
Ordering Information
Part Number
FAN7547AM
FAN7547AMX
Package
14-SOP
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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


Fairchild Semiconductor Electronic Components Datasheet

FAN7547A Datasheet

LCD Backlight Inverter Drive IC

No Preview Available !

FAN7547A pdf
Internal Block Diagram
OUT
Vref
VCC
S/S
RCT
VDS
SW
VZ
UVLO
5V
1.3V
0.1V
Oscillator
Vref
3V
Internal
Bias
Output
Driver
QR
S
Comparator1
VZ
2μA
3.7V
Comparator3
VCC
40μA
Comparator2
Buffer Amplifier
VCC1
SDP
OSC
COMP
FB
120μA
Vb
7V
Comparator4
Va Vref
Comparator5
Vref
OLP
Dimming Control and Mode Selection Block
Analog
PWM
Mixed
2V
Comparator6
50kΩ
50kΩ
Vms
Full Lighting when VDS = 3V
Figure 1. Functional Block Diagram of FAN7547A
1V GND
FAN7547A Rev. 1.01
© 2005 Fairchild Semiconductor Corporation
FAN7547A Rev. 1.0.3
2
www.fairchildsemi.com


Part Number FAN7547A
Description LCD Backlight Inverter Drive IC
Maker Fairchild Semiconductor
Total Page 9 Pages
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