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Inverter Driver. FAN7311BM Datasheet |
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FAN7311B
LCD Backlight Inverter Drive IC
January 2007
Features
High-Efficiency Single-Stage Power Conversion
Wide Input Voltage Range: 5V to 25.5V
Backlight Lamp Ballast and Soft Dimming
Reduced Number of Required External Components
Precision Voltage Reference Trimmed to 2%
ZVS Full-Bridge Topology
Soft-Start Capability
PWM Control at Fixed Frequency
Analog and Burst Dimming Function
Programmable Striking Frequency
Open-Lamp Protection
Open-Lamp Regulation
20-Pin SOIC
Description
The FAN7311B provides all the control functions for a
series parallel resonant converter as well as a pulse
width modulation (PWM) controller to develop a supply
voltage. Typical operating frequency range is between
30kHz and 250kHz, depending on the cold cathode fluo-
rescent lamp (CCFL) and the transformer's characteris-
tics. The FAN7311B uses a new patent-pending phase-
shift control.
20-SOIC
Applications
LCD TV
LCD Monitor
www.DataSheet4U.com
Ordering Information
Part Number
FAN7311BM
FAN7311BMX
Package
20-SOIC
20-SOIC
Pb-Free
Yes
Yes
Operating Temperature Range
-25°C to 85°C
Packing Method
Rail
Tape & Reel
Protected by U.S. Patent: 5,652,479; 7,158,390.
© 2007 Fairchild Semiconductor Corporation
FAN7311B Rev. 1.0.0
www.fairchildsemi.com
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Internal Block Diagram
RT
OSCILLATOR
max. 2V
min. 0.5V
CT
-
+
6μA
+
S_S
RT1
MRT1
Striking
OLP
Logic
S_S
Output
Control
Logic
Output
Driver
Output
Driver
EA_OUT
ADIM
EA_IN
+ Error Amp.
-
Solr 105μA
UVLO
SET
QS
2.5V
QR
CLR
Solr
1.4μA
+
VOLP+α
-
VOLP
UVLO 2.5V 1.5V
+
- 2V
max. 2V
Sburst 85μA
Va+α
BCT
BDIM
min. 0.5V
-
Positive
dimming polarity
+
Sburst
Voltage
Reference
&
Internal
Bias
AGND
UVLO
2.5VREF
VIN
+
-
+
- 1.4V
UVLO 5V
OUTA
OUTB
PGND
OUTC
OUTD
OLP
OLR
REF
ENA
VIN
FAN7311B Rev.00
Figure 1. Functional Block Diagram of FAN7311B
© 2007 Fairchild Semiconductor Corporation
FAN7311B Rev. 1.0.0
2
www.fairchildsemi.com
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Pin Assignments
RT1 OUTB OUTA
20
19
18
VIN PGND OUTC OUTD CT
17
16
15
14
13
RT BCT
12
11
FAN7311B
1
OLP
2
OLR
3
ENA
4
S_S
5
GND
6
REF
7
8
9
10
ADIM BDIM EA_IN EA_OUT
FAN7311B Rev. 00
Figure 2. Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
9
10
Name
OLP
OLR
ENA
S_S
GND
REF
ADIM
BDIM
EA_IN
EA_OUT
Description
Open-Lamp Protection
Open-Lamp Regulation
Enable Input
Soft-Start
Analog Ground
2.5V Reference Voltage
Analog Dimming Input
Burst Dimming Input
Error Amplifier Input
Error Amplifier Output
Pin #
11
12
13
14
15
16
17
18
19
20
Name
BCT
RT
CT
OUTD
OUTC
PGND
VIN
OUTA
OUTB
RT1
Description
Burst Dimming Timing Capacitor
Timing Resistor
Timing Capacitor
NMOSFET Drive Output D
PMOSFET Drive Output C
Power Ground
Supply Voltage
PMOSFET Drive Output A
NMOSFET Drive Output B
Striking Frequency Resistor
© 2007 Fairchild Semiconductor Corporation
FAN7311B Rev. 1.0.0
3
www.fairchildsemi.com
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