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Electrical Characteristics (Continued)
For typical values; T A = 25°C, V IN = 12V, and -25°C ? T A ? 85°C, unless otherwise specified. Specifications to -40°C ~
125°C are guaranteed by design based on final characterization results.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
PWM Dimming Section
V bdim(ON)
V bdim(Off)
PWM Dimming On Voltage
PWM Dimming Off Voltage
2
0
5
0.8
V
V
PWM Dim On Rising Time
f bdim
t bdimR
t bdimF
PWM Dim Input Frequency Range (3)
(3)
PWM Dim Off Falling Time (3 )
On Duty Ratio=1%
Ext. Switch Q g =4.3nC
Ext. Switch Q g =4.3nC
100
400
150
500
Hz
ns
ns
Soft-Start Section
t SS
Soft-Start Time (3)
V OVR =1V, I LED : 0 to
Maximum
10
ms
Protection Section
V TH,OVR
V TH,OCP
T OCP
OVR Threshold Voltage
OCP Threshold Voltage
OCP Shutdown Time (3)
1.35
0.95
1.42
1.00
10
1.49
1.05
V
V
μs
V TH,SLP
SLP Threshold Voltage
V SLPR =1V
9.5
10.0
10.5
V
SLP Delay
OLP Delay
T D,SLP
T D,OLP
(3)
(3)
20
20
μs
μs
Threshold
Hysteresis
V TH,OLP
T TRIP
T TYH
OLP Threshold Voltage
Internal Thermal Protection
(3)
Internal Thermal Protection
(3)
0.27
0.30
150
25
0.33
V
°C
°C
Output Section
V GH
NMOS Gate High Voltage
V IN =12V
8.0
8.5
9.0
V
V GL
V G,UVLO
NMOS Gate Low Voltage
NMOS Gate Voltage with UVLO
Activated
V IN =12V
V IN =7V
0
0.3
V
V
I G,SOURCE
I G,SINK
NMOS Gate Drive Source Current
NMOS Gate Drive Sink Current
V IN =12V
V IN =12V
50
300
150
500
250
700
mA
mA
Note:
3. These Parameters, although guaranteed, are not 100% tested in production.
? 2011 Fairchild Semiconductor Corporation
FAN7346 ? 1.0.0
6
www.fairchildsemi.com
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