FAN7317 — LCD Backlight Inverter Drive IC
January 2008
FAN7317
LCD Backlight Inverter Drive IC
Features
High-Efficiency Single-Stage Power Conversion
Wide Input Voltage Range: 6V to 24V
Backlight Lamp Ballast and Soft Dimming
Minimal Required External Components
Precision Voltage Reference Trimmed to 2%
ZVS Full-Bridge Topology
Soft-Start
PWM Control at Fixed Frequency
Burst Dimming Function
Programmable Striking Frequency
Open-Lamp Protection
Open-Lamp Regulation
Arc Protection
Short-Lamp Protection
CMP-High Protection
High-FB Protection
Thermal Shutdown
20-Pin SOIC
Description
The FAN7317 is a LCD backlight inverter drive IC that
controls P-N full-bridge topology by using the new
patented phase-shift method.
The FAN7317 provides a low-cost solution and reduces
external components by integrating full wave rectifiers for
open-lamp protection and regulation (patent pending).
The operating voltage range of the FAN7317 is wide, so
an external regulator isn’t necessary to supply the
voltage to the IC.
The FAN7317 provides various protections, such as
open-lamp regulation, open-lamp protection, arc
protection, short-lamp protection, CMP-high protection,
and FB-high protection, to increase the system reliability.
The FAN7317 provides burst dimming function and
analog dimming is possible, in a narrow range, by adding
some external components.
The FAN7317 is available in a 20-SOIC package.
Applications
LCD TV
LCD Monitor
Ordering Information
Part Number
FAN7317M
FAN7317MX
Package
20-SOIC
20-SOIC
Operating Temperature
-25 to +85°C
-25 to +85°C
Packing Method
RAIL
TAPE & REEL
All packages are lead free per JEDEC: J-STD-020B standard.
Protected under U.S. patent nos. 5,652,479 and 7,158,390.
© 2007 Fairchild Semiconductor Corporation
FAN7317 • 1.0.2
www.fairchildsemi.com
FAN7317 — LCD Backlight Inverter Drive IC
Typical Application Circuit (LCD Backlight Inverter)
Application
22-Inch LCD Monitor
Device
FAN7317
Input Voltage Range
13±10%
Number of lamps
4
1. Features
High-Efficiency Single-Stage Power Conversion
P-N Full-Bridge Topology
Reduces Required External Components
Enhanced System Reliability through Protection Functions
20
19
18
17
16
15
14
13
12
OUTD
OUTB
9
VIN
OLP1
BDIM
REF
BCT
Figure 56. Typical Application Circuit
2. Transformer Schematic Diagram
Figure 57. Transformer Schematic Diagram
3. Core & Bobbin
Core: EFD2126
Material: PL7
Bobbin: EFD2126
© 2007 Fairchild Semiconductor Corporation
FAN7317 • 1.0.2
www.fairchildsemi.com
20
10
1
2
3
4
5
6
7
8
OUTA
OLR1
OLR2
OLP2
GND
IC1
OUTC
CMP
ENA
CT
OLR4
OLP3
OLR3
OLP4
11
ON/OFF
BDIM(0~3.3V)
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