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LT3599
TYPICAL PERFORMANCE CHARACTERISTICS T A = 25°C unless otherwise speci?ed
SHDN /UVLO Pin Turn-On
SHDN /UVLO Pin
1.45
Threshold (V SD_UVLO )
6
(Hysteresis) Current
500
450
V IN Current (Shutdown)
1.40
5
4
JUST BEFORE PART TURN-ON
400
350
300
1.35
3
250
1.30
2
1
200
150
100
V IN = 30V
V IN = 3V
50
1.25
–50 –25
0
25
50
75
100 125 150
0
–50 –25
AFTER PART TURN-OFF
0 25 50 75 100 125 150
0
–50 –25
0
25
50
75
100 125 150
1250
1240
V REF
JUNCTION TEMPERATURE (°C)
3599 G01
3.0
2.5
JUNCTION TEMPERATURE (°C)
Switching Frequency
2.1MHz
3599 G02
10000
JUNCTION TEMPERATURE (°C)
Switching Frequency vs R T
3599 G03
2.0
V IN = 30V
1230
V IN = 3V
1.5
1.0
1MHz
1000
1220
0.5
0.2MHz
1210
–50 –25
0
25
50
75
100 125 150
0
–50 –25
0
25
50
75
100 125 150
100
10
100
1000
JUNCTION TEMPERATURE (°C)
LED Current vs CTRL Pin
3599 G04
JUNCTION TEMPERATURE (°C)
Soft-Start Pin Current
3599 G05
R T (k)
T SET Pin Threshold
vs Junction Temperature
3599 G06
120
100
I SET = 13.3k
13
12
900
850
800
80
60
40
20
11
10
9
8
750
700
650
600
550
0
0
0.2
0.4
0.6
0.8
1.0
1.2
7
–50 –25
0
25
50
75
100 125 150
500
0
25
50
75
100 125
150
CTRL PIN VOLTAGE (V)
3599 G07
JUNCTION TEMPERATURE (°C)
3599 G08
JUNCTION TEMPERATURE (°C)
3599 G09
3599fe
5
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