ISL97801
Typical Performance Curves (Continued)
10
8
6
4
2
0
5 LEDs
I LEDpeak = 380mA
10% @ 100Hz
16
14
12
10
8
6
3 LEDs
I LEDpeak = 380mA
-2
-4
-6
-8
10% @ 10kHz
99% @ 10kHz
99% @ 100Hz
4
2
0
-2
99% @ 100Hz
99% @ 10kHz
-10
4
6
8
10
12
14
16
-4
4
5
6
7
8
9
10
V IN (V)
FIGURE 7. 5 LEDs CURRENT ACCURACY vs INPUT VOLTAGE
V IN (V)
FIGURE 8. 3 LEDs CURRENT ACCURACY vs INPUT VOLTAGE
400
8 LEDs
395 I LEDpeak = 380mA
390 DUTY CYCLE = 99%
420
415
410
405
5 LEDs
I LEDpeak = 380mA
DUTY CYCLE = 99%
385
380
375
370
365
360
355
PWM @ 1kHz
PWM @ 10kHz
PWM @ 100Hz
400
395
390
385
380
375
370
365
360
355
99% @ 10kHz
99% @ 100Hz
350
6
8
10
12
14
16
18
350
4
6
8
10
12
14
16
V IN (V)
FIGURE 9. 8 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 99%
V IN (V)
FIGURE 10. 5 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 99%
39 I
410
405
400
395
390
3 LEDs
I LEDpeak = 380mA
DUTY CYCLE = 99%
40
8 LEDs
LEDpeak = 380mA
38 DUTY CYCLE = 10%
37
36
PWM @ 100Hz
385 PWM @ 100Hz
380
375
370
PWM @ 10kHz
365
35
34
33
32
31
PWM @ 1kHz
PWM @ 10kHz
360
4
5
6
7
8
9
10
30
6
8
10
12
14
16
18
V IN (V)
FIGURE 11. 3 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 99%
5
V IN (V)
FIGURE 12. 8 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 10%
FN6428.1
April 2, 2007
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