ISL97671A
Typical Performance Curves
100
90
80
6P10S LEDs
100
90
80
70
60
12V IN
24V IN
5V IN
70
60
580kH z
1.2MHz
50
40
30
20
10
50
40
30
20
10
0
0
5
10
15
20
25
30
35
0
0
5
10
15
20
25
30
I LED (mA)
FIGURE 3. EFFICIENCY vs UP TO 30mA LED CURRENT (100% LED
DUTY CYCLE) vs V IN
100
80
V IN (V)
FIGURE 4. EFFICIENCY vs V IN vs SWITCHING FREQUENCY AT 20mA
(100% LED DUTY CYCLE)
100
90
80
+85°C
60
580k
1.2MHz
70 +25°C
60
0°C
-40°C
50
40
20
0
40
30
20
10
0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
V IN (V)
FIGURE 5. EFFICIENCY vs V IN vs SWITCHING FREQUENCY AT 30mA
(100% LED DUTY CYCLE)
0.40
0.30
0.20
V IN (V)
FIGURE 6. EFFICIENCY vs V IN vs TEMPERATURE AT 20mA
(100% LED DUTY CYCLE)
1.2
1.0
0.10
0.8
4.5 V IN
0.00
-0.10
4.5V IN
12V IN
0.6
0.4
12 V IN
-0.20
-0.30
21V IN
0.2
-0.40
0
1
2
3
4
5
6
7
0
0
1
2 3
4
5
6
CHANNEL
FIGURE 7. CHANNEL-TO-CHANNEL CURRENT MATCHING
8
PWM DIMMING DUTY CYCLE(%)
FIGURE 8. CURRENT LINEARITY vs LOW LEVEL PWM DIMMING
DUTY CYCLE vs V IN
FN7709.3
November 30, 2012
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