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Electrical Characteristics (Continued)
For typical values, T A = 25°C and V CC = 15 V, unless otherwise specified. Specifications to -25°C ~ 85°C are
guaranteed by design based on final characterization results .
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
Output Section (Boost / Dimming)
V DRV
V uv
I dsur
I dsin
t rh
t fl
Gate Output Voltage
Gate Output Voltage Before Startup
Gate Output Drive Source Current (4)
Gate Output Drive Sink Current (4)
(4)
Gate Output Rising Time (Boost)
(4)
Gate Output Falling Time (Boost)
V CC =15 V
C L =2.0 nF
C L =2.0 nF
10.8
-0.5
80
80
11.8
180
180
200
120
12.8
0.5
280
280
V
V
mA
mA
ns
ns
Current Sense Section
t blank
Leading-Edge Blanking
(4)
150
300
450
ns
Comparator
t delay,cl
Delay to Output of Current-Limit
(4)
180
ns
Comparator
V offset,clc
Offset Voltage of Current-Limit
(4)
-20
20
mV
Slope Compensation Section
I slope
R slope
Ramp Generator Current
Slope Compensation Resistor
(4)
36
45
5
54
μA
kΩ
Soft-Star t Section
t ss
Soft-Start Period (4)
f osc =200 kHz
3
ms
Protection Section
t d,ovp.tr
t d,ovpr
t d.oc p
t AR
t d,ol pi
t d,ol p
V th,ovp
V hys ,ovp
V th.csoc p
V th,oc p
Delay for Triggering Over-Voltage
Protection (4)
Delay for Releasing Over-Voltage
Protection (4)
Delay for Over-Current Protection (4)
Auto-Restart Time for Over-Current
Protection (4)
Delay for Triggering Open-LED Protection (4)
Delay for Open-LED Protection
Over-Voltage Protection Threshold Voltage
Over-Voltage Protection Voltage Hysteresis
Boost Switch Current Limit Threshold
Voltage
LED Over-Current Protection Threshold
Voltage
f osc =200 kHz
f osc =200 kHz
15
10
3
2.85
0.45
1.4
(Min.
Clamp)
20
14
1
640
5
40.96
3.00
0.1
0.50
4.0xV ADIM
25
18
7
3.15
0.55
4.0
(Ma x.
Clamp)
μs
μs
μs
μs
μs
ms
V
V
V
V
Thermal Shutdown Temperature
V th,ol p
T SD
T HYS
Open-LED Protection Threshold Voltage
(4)
(4)
Thermal Shutdown Hysteresis
(4)
0.15
140
0.20
150
20
0.25
160
V
°C
°C
Notes:
4.
These parameters, although guaranteed, are not tested in production.
? 2013 Fairchild Semiconductor Corporation
FAN7340 ? 1.0.1
6
www.f airchildsemi.com
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