ISL78171 Datasheet, PDF (9/29 Pages) Intersil Corporation – 6-Channel, 50mA Automotive LED Driver with Ultra-high Dimming Ratio and Phase Shift Control

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