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ISL78171ARZ Datasheet(PDF) 9 Page - Intersil Corporation

Part # ISL78171ARZ
Description  6-Channel, 50mA Automotive LED Driver with Ultra-high Dimming Ratio and Phase Shift Control
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL78171ARZ Datasheet(HTML) 9 Page - Intersil Corporation

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ISL78171
9
FN8602.0
June 15, 2015
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FIGURE 9. EFFICIENCY vs LED CURRENT AT LX
FREQUENCY = 1.2MHz AT +105°C vs VIN
FIGURE 10. EFFICIENCY VS INPUT VOLTAGE AT LX
FREQUENCY = 1.2MHz vs VIN
FIGURE 11. CHANNEL-TO-CHANNEL CURRENT MATCHING, 600kHz vs VIN
FIGURE 12. CURRENT LINEARITY vs LOW LEVEL PWM DIMMING
DUTY CYCLE vs VIN
FIGURE 13. NORMALIZED LED CURRENT vs. DIMMING FACTOR,
(MEASURED AT ILED = 20mA)
Typical Performance Curves LED configuration: 6P10S (Continued)
LED CURRENT (A)
50
55
60
65
70
75
80
85
90
95
0
0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
5V
12V
24V
26.5V
60
65
70
75
80
85
90
95
0
5
10
15
20
25
30
VIN (V)
-40°C
+25°C
+105°C
CHANNEL NUMBER
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
01
2
3
4
5
5V
12V
24V
26.5V
5V
12V
24V
26.5V
5V
12V
24V
26.5V
+25°C,
+105°C,
-40°C,
0
0.2
0.4
0.6
0.8
1.0
1.2
01
4
PWM DIMMING DUTY CYCLE (%)
23
56
12 VIN
4.5 VIN
0.00001
0.0001
0.001
0.01
0.1
1
0.00001
0.0001
0.001
0.01
0.1
1
DIMMING FACTOR
(PWM Reg Value x DC Reg Value) / (255 x 255)


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