Fairchild FAN7547AMXC Lcd backlight inverter drive ic Datasheet

FAN7547A
LCD Backlight Inverter Drive IC
Features
Description
„ Backlight Lamp Ballast and Soft Dimming
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.
„ 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
14-SOP
„ P-Channel MOSFET Drive
„ Open-Lamp Protections (OLP)
„ Shutdown Protections (SDP)
„ 14-Pin SOP
Ordering Information
Part Number
FAN7547AM
FAN7547AMX
Package
Pb-Free
14-SOP
Yes
© 2005 Fairchild Semiconductor Corporation
FAN7547A Rev. 1.0.3
Operating Temperature Range Packing Method
-25°C ~ +85°C
Tube
Tape & Reel
www.fairchildsemi.com
FAN7547A LCD Backlight Inverter Drive IC
February 2007
OUT
VCC1
VZ
Vref
SW
Vref
3V
Output
Driver
Internal
Bias
VZ
Q
2μA
R
SDP
S
VCC
3.7V
Comparator1
OSC
UVLO
5V
VCC
COMP
FB
S/S
1.3V
Comparator3
40μA
Comparator2
0.1V
RCT
Buffer
Amplifier
OLP
Oscillator
120μA
7V
Comparator4
Vb
Va
Comparator5
Dimming Control and Mode Selection Block
VDS
Vref
Vref
50kΩ
Vms
2V
Analog
PWM
Mixed
Comparator6
50kΩ
1V
GND
Full Lighting when VDS = 3V
FAN7547A Rev. 1.01
Figure 1. Functional Block Diagram of FAN7547A
© 2005 Fairchild Semiconductor Corporation
FAN7547A Rev. 1.0.3
www.fairchildsemi.com
2
FAN7547A LCD Backlight Inverter Drive IC
Internal Block Diagram
FAN7547A LCD Backlight Inverter Drive IC
Pin Configuration
OUT
VCC1
VCC
OSC
S/S
COMP
FB
14
13
12
11
10
9
8
FAN7545A
1
2
3
4
5
6
7
GND
VDS
Vref
Vms
RCT
OLP
SDP
FAN7547A Rev. 1.00
Figure 2. Pin Configuration (Top View)
Pin Definitions
Pin #
Name
I/O
Description
1
GND
2
VDS
I
Dimming Voltage Input
3
Vref
O
Reference Voltage
4
Vms
I
5
RCT
6
OLP
I
Open-Lamp Protection
7
SDP
I
Shutdown Protection
8
FB
I
Feedback Input
9
COMP
10
S/S
11
OSC
Ground
Dimming Mode Selection
Burst Dimming Frequency Set
Error Amplifier Output
Soft-Start
I
Main Ct
12
VCC
I
Supply Voltage
13
VCC1
I
Output Drive Source Voltage
14
OUT
O
Output Drive
© 2005 Fairchild Semiconductor Corporation
FAN7547A Rev. 1.0.3
www.fairchildsemi.com
3
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In
addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only. -25°C ≤ TA ≤ 85°C and VCC=10V unless otherwise specified.
Symbol
VCC
Parameter
Supply Voltage
Value
Unit
6 to 30
V
150
°C
TJ
Operating Junction Temperature
TA
Operating Temperature Range
-25 to 85
°C
Storage Temperature Range
-65 to 150
°C
0.5
W
TSTG
PD
Power Dissipation
© 2005 Fairchild Semiconductor Corporation
FAN7547A Rev. 1.0.3
www.fairchildsemi.com
4
FAN7547A LCD Backlight Inverter Drive IC
Absolute Maximum Ratings
Unless otherwise noted, these specifications apply to the operating ambient temperatures for the FAN7547A with
-25°C ≤ TA ≤ 85°C and VCC = 10V.
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
UVLO SECTION
VST
Start Voltage
5.4
5.9
V
IST
Start Current
VCC = 4.5V
4.9
50
200
μA
ICC
Operating Current
7V < VCC< 30V
5.5
8.0
mA
2.95
3.05
3.15
V
REFERENCE SECTION
Vref
Reference Voltage
TJ = 25°C, Iref = 0mA, 7V < VCC< 30V
SOFT-START SECTION
ISS
Ipwm
Soft -Start Charge Current
CSS = 4V
33
40
47
μA
PWM Discharge Current
CSS = 4V
48
70
85
μA
7V < VCC < 30V
170
200
230
Hz
OSCILLATOR SECTION
fpwm
Operating Frequency
Vpwmh
Osc High Voltage
1.3
V
VpwmI
Osc Low Voltage
0.1
V
DIMMING SECTION
Va
Vb
Va
Vb
Va
Vb
Analog Dimming Range
Vms > 2V
PWM Dimming Range
Vms < 1V
Mixed Dimming Range
Vms =1.5V or open
0
3
3
2.1
2.5
V
V
2.9
V
0
2.5
V
1.2
3.0
V
0
3
V
MODE SELECTION
Vsa
Analog Dimming Select Voltage
1.5
2.0
2.5
V
Vsp
PWM Dimming Select Voltage
0.7
1.0
1.3
V
Vsc
Mixed Dimming Select Voltage
1.2
1.5
1.8
V
7V < VCC < 30V
2.5
3.0
3.5
V
7V < VCC < 30V
1
2
3
μA
2.5
3.0
3.5
V
8
9
10
V
1
V
OPEN-LAMP PROTECTION
Vopen
Open-Lamp Detect Voltage
SHUTDOWN PROTECTION
Isd
Shutdown Current
Vsd
Shutdown Voltage
OUTPUT SECTION
VOH
Output High Voltage
VCC = 10V
VOL
Output Low Voltage
VCC = 10V
tr
Rising Time
VCC = 10V
120
200
ns
tf
Falling Time
VCC = 10V
60
120
ns
Output Voltage with UVLO
Activated
VCC = 4V
4
V
VUV
© 2005 Fairchild Semiconductor Corporation
FAN7547A Rev. 1.0.3
2
www.fairchildsemi.com
5
FAN7547A LCD Backlight Inverter Drive IC
Electrical Characteristics
Start Voltage vs Temparature
6
5.75
Start
Start Voltage
Voltage[V][V]
5
[mA]
IICC
CC [mA]
4
3
2
5.50
5.25
1
5.00
0
0
5
10
15
20
25
30
-20
0
VCC [V]
[V]
V
CC
Figure 3. Start Voltage
60
80
100
Reference Voltage vs Temparature
Start Current vs Temparature
3.15
Reference
Voltage [V]
Reference Voltage[V]
90
Start
[μA]
StartCurrent
Current[uA]
40
Figure 4. Start Voltage vs. Temperature
120
60
30
0
-20
0
20
40
60
80
3.10
3.05
3.00
2.95
100
-15
0
Temparature['C][°C]
Temperature
15
30
45
60
75
90
Temparature['C]
Temperature
[°C]
Figure 5. Output vs. Temperature
Figure 6. Reference Voltage vs. Temperature
Soft Start Charge Current vs Temparature
Operating Frequency vs Temparature
230
Operating
Frequency [Hz]
Operating Frequency[Hz]
Soft-Start
Current [μA]
Soft StartCharge
Charge Current[uA]
20
Temparature['C][°C]
Temperature
45
42
39
36
33
-20
0
20
40
60
80
210
200
190
180
170
100
-20
Temparature['C][°C]
Temperature
0
20
40
60
80
100
Temparature['C]
Temperature
[°C]
Figure 7. Soft-Start Charge Current vs. Temperature
Figure 8. Operating Frequency vs. Temperature
© 2005 Fairchild Semiconductor Corporation
FAN7547A Rev. 1.0.3
220
www.fairchildsemi.com
6
FAN7547A LCD Backlight Inverter Drive IC
Typical Characteristics
ShutDown Voltage vs Temparature
ShutDown Current vs Temparature
3.4
Shutdown
ShutDown Voltage
Voltage[V][V]
Shutdown
[μA]
ShutDownCurrent
Current[uA]
2.8
2.4
2.0
1.6
3.2
3.0
2.8
2.6
1.2
-20
0
20
40
60
80
-20
100
0
20
40
60
80
100
Temparature['C]
Temparature['C]
Temperature [°C]
Temperature [°C]
Figure 9. Protection Current vs. Temperature
Figure 10. Protection Voltage vs. Temperature
Output High Voltage vs Temparature
Output Low Voltage vs Temparature
Output
Voltage [V]
Output Low
Low Voltage[V]
Output
High
Output
HighVoltage
Voltage[V][V]
10.0
9.6
9.2
8.8
8.4
0.8
0.4
0.0
-0.4
8.0
-20
0
20
40
60
80
100
-20
Temparature['C]
Temperature
[°C]
20
40
60
80
100
Temparature['C]
Temperature
[°C]
Figure 11. Output High Voltage vs. Temperature
Output
withUVLO
UVLO
Activated [V]
OutputVoltage
Voltage with
Activated[V]
0
Figure 12. Output Low Voltage vs. Temperature
Output Voltage with UVLO Activated vs Temparature
4.0
3.5
3.0
2.5
2.0
-20
0
20
40
60
80
100
Temparature['C]
Temperature
[°C]
Figure 13. Output Voltage with UVLO Activated vs.
Temperature
© 2005 Fairchild Semiconductor Corporation
FAN7547A Rev. 1.0.3
www.fairchildsemi.com
7
FAN7547A LCD Backlight Inverter Drive IC
Typical Characteristics (Continued)
FAN7547A LCD Backlight Inverter Drive IC
Package Dimensions
14-SOP
Dimensions are in millimeters unless otherwise noted.
Figure 14. 14-Lead Small Outline Package (SOP)
© 2005 Fairchild Semiconductor Corporation
FAN7547A Rev. 1.0.3
www.fairchildsemi.com
8
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Advance Information
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First Production
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Rev. I23
© 2007 Fairchild Semiconductor Corporation
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