www.fairchildsemi.com
LCD Back Light Inverter Drive IC
Features
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High Efficiency Single Stage Power Conversion
Wide Input Voltage Range 6V to 25V
Back Light Lamp Ballast and Soft Dimming
Few External Components
Precision Voltage Reference Trimmed to 2%
Soft Start
PWM and PFM Control
Analog, Burst and Mixed Dimming Function
Allows All N-Channel MOSFET Drive
Double Pulse Suppression Logic
Open Lamp Detection
Output Short Circuit Protection
Open Lamp Regulation
20 Pin SSOP
FAN7300
Description
The FAN7300 provides all the control functions for a
series parallel resonant converter and also contains a pulse
width modulation (PWM) controller to develop a supply
voltage. Typical operating frequency range is between
30kHz and 100kHz depending on the CCFL and the
transformer's characteristics.
20-SSOP
Rev. 1.0.0
©2003 Fairchild Semiconductor Corporation
FAN7300
Internal Block Diagram
VZ
3V
V3
Vz
8V
UVLO
Internal
Bias
1.5Vref
COMP6
SCP
+
-
ENA
5.4V
R
S
Q
2uA
COMP7
+
OLP
3.7V
-
3V
Vm2
VS
-
+
Vz
1.5V
Multiplier
Gain
K
8uA
S_S
Va
EA_IN
+
+
-
Clock
E/A
Controller
EA_OUT
Main Control
Oscillator
Rt
OLR
COMP3
+
-
3V
COMP2
Va
-
min. 0.25V
min. 0.25V
-
COMP1
R
Q
Q
High side
gate driver
CPUMP
Vmo
Error Amp.
+
Vm1
Buffer
S
max. 1.75V
Current
Generator
max. 1.75V
Vb
COMP4
+
DIM
2
+
Analog
Burst
Mixed
COMP5
-
Dimming control and Mode Selection
1.5V
DIM_MODE
1.5V
-
3V
Vz
Low side
gate driver
-
+
V3
Vcc
+
3.7V
OUT_H
OUT_L
GND
Ct
BCt
50K
50K
FAN7300
Pin Assignments
DIM_MODE
EA_OUT
CPUMP
V3
DIM
EA_IN
SCP
OLR
VZ
20
19
18
17
16
15
14
13
12
11
FAN7300
1
OLP
2
Rt
3
Ct
4
BCt
5
S_S
6
ENA
7
VS
8
VCC
9
GND
10
OUT_L
Pin Definitions
No
1
2
3
4
5
6
7
8
9
10
Name
OLP
Rt
Ct
BCt
S_S
ENA
VS
VCC
GND
OUT_L
Function Description
Open Lamp Protection
Timing Resistor
Timing Capacitor
Burst Dimming Timing Capacitor
Soft Start
Enable Input
Voltage Sensing
Supply Voltage
Ground
Low Side Gate Drive Output
No
11
12
13
14
15
16
17
18
19
20
Name
OUT_H
CPUMP
VZ
OLR
SCP
EA_IN
EA_OUT
DIM
DIM_MODE
V3
Function Description
High Side Gate Drive Output
Charge Pump
Zener Voltage
Open Lamp Regulation
Short Circuit Protection
Error Amplifier Input
Error Amplifier Output
Dimming Input
Dimming Mode Selection
3V Reference Voltage
OUT_H
3
FAN7300
Absolute Maximum Ratings
Vcc=10V, for typical values Ta=25°C, for min/max values Ta is the operating ambient temperature range with
-25°C
≤
Ta
≤
85°C and 6V
≤
Vcc
≤
25V, unless otherwise specified.
Characteristics
Supply Voltage
Operating Temperature Range
Storage Temperature Range
Thermal Resistance Junction-Air (Note1,2)
Power Dissipation
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm(1S0P)
JEDEC standard: JESD51-3, JESD51-7
2. Assume no ambient airflow
Symbol
V
CC
Topr
Tstg
R
θJA
Pd
Value
6 ~ 25
-25 ~ 85
-65 ~ 150
112
1.1
Unit
V
°C
°C
°C/W
W
4
FAN7300
Electrical Characteristics
Vcc=10V, for typical values Ta=25°C, for min/max values Ta is the operating ambient temperature range with
-25°C
≤
Ta
≤
85°C and 6V
≤
Vcc
≤
25V, unless otherwise specified.
Characteristics
REFERENCE SECTION
Reference Voltage
Line Regulation
3V Regulation Voltage
OSCILLATOR SECTION(MAIN)
Oscillation Frequency
CT High Voltage
CT Low Voltage
OSCILLATOR SECTION(BURST)
Oscillation Frequency
BCT High Voltage
BCT Low Voltage
ERROR AMP SECTION
Feedback Output High Voltage
Output Sink Current
Output Source Current
Feedback High Voltage On Burst Dimming
MULTIPLIER SECTION
Multiplier Input Voltage High
Multiplier Gain
SOFT START SECTION
Soft Start Current
Soft Start Clamping Voltage
PROTECTION SECTION
Open Lamp Protection Voltage
Short Circuit Protection Voltage
Open Lamp Regulation
Vpr
Vsc
Vor
-
-
-
2.5
2.5
2.5
3
3
3
3.5
3.5
3.5
V
V
V
I
SS
Vssh
S_S=2V
-
5
3
8.3
3.7
11.6
4.4
uA
V
Vmih
K
-
-
1.4
-
1.6
0.85
1.8
-
V
1/V
Veh
lsin
lsur
Vfbh
EA_IN = 0V
EA_OUT = 2.2V
EA_OUT = 2.2V
R(EA_IN) = 50kΩ
3.2
-
1
3.7
-
-
4.2
-1
-
Va+0.7
V
mA
mA
V
fosc
Vbcth
Vbct1
Ctb = 180nF
-
-
125
-
-
170
1.75
0.25
205
-
-
Hz
V
V
fosc
Vcth
Vbct1
Ct = 330pF, Rt = 14k
-
-
75
-
-
95
1.75
0.25
115
-
-
kHz
V
V
Vref
∆Vref
V3
-
8
≤
V
CC
≤
20V
-
1.46
-
2.86
1.5
2
2.96
1.54
25
3.06
V
mV
V
Symbol
Test Condition
Min.
Typ.
Max.
Unit
Va+0.1 Va+0.4
5
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