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FAN7311_07 Datasheet, PDF (5/16 Pages) Fairchild Semiconductor – LCD Backlight Inverter Drive IC
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Electrical Characteristics
For typical values, TA=25°C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range
with -25°C ≤ TA ≤ 85°C and 5V ≤ VIN ≤ 25.5V, unless otherwise specified. Specifications from -25°C to 85°C are guar-
anteed by design based on final characterization results.
Symbol
Characteristics
Test Condition Min. Typ. Max. Unit
REFERENCE SECTION (Recommend X7R Capacitor)
ΔVref Line Regulation
V25 2.5V Regulation Voltage
5 ≤ VIN ≤ 25.5V
2
25
mV
2.45 2.50 2.55
V
OSCILLATOR SECTION (MAIN)
fosc Oscillation Frequency
TA = 25°C, CT = 270pF,
RT = 18kΩ
110.4
115.0
119.6
kHz
CT = 270pF, RT = 18kΩ 108
115
122
Vcth CT High Voltage
Vctl CT Low Voltage
OSCILLATOR SECTION (BURST)
2.0
V
0.5
V
foscb Oscillation Frequency
TA = 25°C, CTB = 10nF,
RT=18kΩ
209.25
225.00
240.75
Hz
CTB = 10nF, RT=18kΩ 206.25 225.00 241.75
Vbcth BCT High Voltage
Vbctl BCT Low Voltage
ERROR AMP SECTION
Av
GBW
Open Loop Gain(3)
Unit Gain Bandwidth(3)
Veh Feedback Output High Voltage
EA_IN = 0V
lsin Output Sink Current
EA_OUT = 1.5V
lsur Output Source Current
EA_OUT = 1.5V
Iolr EA_IN Driving Current on OLR
Iburst EA_IN Driving Current on Burst Dimming
Vfbh Feedback High Voltage on Burst Dimming R(EA_IN) = 60kΩ
SOFT-START SECTION
2
V
0.5
V
2.00
1
75
61
Va+0.1
80
1.5
2.27
105
85
Va+0.4
2.54
-1
135
109
Va+0.7
dB
MHz
V
mA
mA
µA
µA
V
ISS Soft-Start Current
Vssh Soft-Start Clamping Voltage(3)
PROTECTION SECTION
S_S=1V
4
6
8
µA
4
V
Volp0 Open-Lamp Protection Voltage 0
Start at open lamp
2.2
2.5
2.8
V
Volp1 Open-Lamp Protection Voltage 1
Normal -> open lamp
1.3
1.5
1.7
V
Volr Open-Lamp Regulation Voltage
1.75 2.00 2.25
V
Iolp Open-Lamp Protection Charging Current
0.7
1.4
2.1
µA
UNDER-VOLTAGE LOCKOUT SECTION
Vth Start Threshold Voltage
Ist Startup Current
Iop Operating Supply Current
Isb Stand-by Current
VIN = Vth-0.2
VIN = 12V
VIN = 12V
5
V
130
180
µA
1.5
4.0
mA
200
370
µA
Note:
3. These parameters, although guaranteed, are not 100% tested in production.
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
5
www.fairchildsemi.com
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