LT3475/LT3475-1
TYPICAL PERFOR A CE CHARACTERISTICS
LED Current vs V ADJ
LED Current vs Temperature
Switch On Voltage
1.50
1.25
1.00
0.75
0.50
0.25
T A = 25°C
1.2
1.0
0.8
0.6
0.4
0.2
V ADJ = V REF ? 2/3
V ADJ = V REF ? 7/30
600
500
400
300
200
100
T A = 25°C
0
0
0.25
0.5 0.75
1
1.25
0
–50 –25
0
25
50
75
100
125
0
0
0.5 1.0
1.5
2.0
V ADJ (V)
Switch Current Limit
vs Duty Cycle
3475 G01
TEMPERATURE (?C)
Switch Current Limit vs
Temperature
3475 G02
SWITCH CURRENT (A)
3475 G03
Current Limit vs Output Voltage
3.0
3.5
3.0
T A = 25°C
2.5
2.0
TYPICAL
MINIMUM
3.0
2.5
2.5
2.0
2.0
1.5
1.5
1.5
1.0
0.5
1.0
0.5
1.0
0.5
0
0
20
40 60
T A = 25°C
80 100
0
–50 –25
0
25 50 75
100
125
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
DUTY CYCLE (%)
Oscillator Frequency
vs Temperature
3475 G04
TEMPERATURE (°C)
Oscillator Frequency Foldback
3475 G05
V OUT (V)
Oscillator Frequency vs R T
3475 G06
700
650
R T = 24.3kΩ
700
600
T A = 25°C
R T = 24.3kΩ
T A = 25°C
1000
600
500
400
550
300
500
450
200
100
400
0
10
–50 –25
0
25
50
75
100
125
0
0.5
1.0
1.5
2.0
2.5
1
10
100
TEMPERATURE (?C)
3475 G07
V OUT (V)
3475 G08
R T (kΩ)
3475 G09
3475fb
4
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