LT3474/LT3474-1
TYPICAL PERFORMANCE CHARACTERISTICS
LED Current vs VADJ
LED Current vs Temperature
Switch Voltage Drop
1200
1000
800
1000
800
600
400
200
0
700
600
500
400
300
200
100
0
T
= 25°C
T
= 25°C
A
A
V
ADJ
= V
REF
600
400
200
0
V
ADJ
= V /5
REF
50
100 125
–50 –25
0
25
75
0
0.25
0.5
V
0.75
(V)
1
1.25
1000
500
SWITCH CURRENT (mA)
1500
0
TEMPERATURE (°C)
ADJ
3474 GO3
3474 G05
3474 G04
Switch Current Limit vs
Temperature
Current Limit vs Duty Cycle
Current Limit vs Output Voltage
2.5
2
2.5
2
2.5
2
T
= 25°C
A
TYPICAL
MINIMUM (85°C)
1.5
1
1.5
1
1.5
1
MINIMUM (125°C)
0.5
0.5
0
0.5
0
0
0
4
6
8
10
12
2
–50 –25
0
25
50
75 100 125
0
20
40
60
80
100
V
(V)
TEMPERATURE (°C)
OUT
DUTY CYCLE (%)
3474 G08
3474 G07
3474 G06
Oscillator Frequency vs
Temperature
Oscillator Frequency vs RT
Oscillator Frequency Foldback
600
550
500
450
600
500
R
T
= 80.6k
T
= 25°C
= 80.6k
T
= 25°C
A
T
A
R
1000
400
300
200
100
0
100
400
10
100
–50 –25
0
25
50
75 100 125
0
0.5
1
1.5
(V)
2
2.5
R
T
(kΩ)
TEMPERATURE (°C)
V
OUT
3474 G09
3474 G10
3474 G11
3474fd
4
Linear [ Linear ]
