lt3475efe-trpbf Linear Technology Corporation, lt3475efe-trpbf Datasheet - Page 4

• Manufacturer Part Number: lt3475efe-trpbf
• Description: Dual Step-down 1.5a Led Driver
• Manufacturer: Linear Technology Corporation

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