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SC4509
POWER MANAGEMENT
Typical Characteristics (Cont.)
EN/SS Input Current vs. EN/SS Voltage vs. Temperature,
V IN = 3.6V; V OUT = 16V
55.0
50.0
45.0
16.0
14.0
PRELIMINARY
Output Voltage vs. EN/SS Voltage vs. Temperature,
V IN = 3.6V; V OUT = 16V
40.0
40°C
25°C
35.0
30.0
25.0
40°C
25°C
12.0
10.0
85°C
8.0
20.0
15.0
10.0
85°C
6.0
4.0
5.0
0.0
2.0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
22
20
18
16
VEN/SS (Volts)
LED Current vs. PWM Dimming Duty Cycle
V IN = 3.6V; V OUT = 16V; FPWM = 10kHz
22
20
18
16
14
VEN/SS (Volts)
LED Current vs. PWM Dimming Duty Cycle
V IN = 3.6V; V OUT = 16V; FPWM = 1kHz
12
14
10
12
10
8
8
6
4
2
6
15
25
35
45
55
65
75
85
95
0
0
10
20
30
40
50
60
70
80
90
100
DTY (%)
Switch Current Limit vs. Complementary
DTY (%)
Switch Current Limit vs. Temperature vs.
800
700
Duty Cycle (1-D) vs. Temperature
-40°C
700
650
Complementary Duty Cycle (1-D)
10%
20%
600
600
550
500
0°C
500
450
400
400
60%
300
25°C
350
90%
85°C
300
40%
200
250
100
200
0
10
20
30
40
50
60
70
80
90
100
-40
-20
0
20
40
60
80
100
(1-D) (%)
Temperature (Deg. C)
? 2007 Semtech Corp.
10
www.semtech.com
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