LT1942(RevA) Ver la hoja de datos (PDF) - Linear Technology
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LT1942 Datasheet PDF : 16 Pages
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LT1942
TYPICAL PERFOR A CE CHARACTERISTICS
LED1 to LED2 Current Matching
2.0 VLED1 = VLED2 + 1V
1.5
TA = 85°C
1.0
0.5
TA = 25°C
0
TA = –40°C
–0.5
–1.0
–1.5
–2.0
2
6 10 14 18 22 26 30 34
LED2 CURRENT (mA)
1942 G13
D4 Forward Voltage
1400
TA = 25°C
1200
1000
800
600
400
200
0
0.1
1
10
100
1000
D4 CURRENT (mA)
1942 G16
VOUT3 vs IOUT3
500
450
400
350
300
250
200
150
100
50
0
0.01
TA = 25°C
TA = 85°C
TA = –40°C
0.1
1
IOUT3 CURRENT (mA)
10
1942 G14
VOFF Diode Forward Voltage
1400
TA = 25°C
1200
1000
800
600
400
200
0
0.1
1
10
100
1000
VOFF DIODE CURRENT (mA)
1942 G17
LED Open-Circuit Protection
Voltage
44.0
43.8
43.6
43.4
43.2
43.0
42.8
42.6
42.4
42.2
42.0
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
1942 G08
VON Diode Forward Voltage
1400
TA = 25°C
1200
1000
800
600
400
200
0
0.1
1
10
100
1000
VON DIODE CURRENT (mA)
1942 G19
AVDD Switcher Current Limit
300
TA = 25°C
250
200
150
100
50
0
20 30
40 50 60 70
DUTY CYCLE (%)
80 90
1942 G18
LED Switcher Current Limit
900
TA = 25°C
800
700
600
500
400
300
200
100
0
20 30 40 50 60 70 80 90
DUTY CYCLE (%)
1942 G20
1942fa
6
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