ISL78100_15 Datasheet, PDF (5/19 Pages) Intersil Corporation – High Power LED Driver

ISL78100
Typical Performance Curves (Continued)
10
8
5 LEDs
I_LEDpeak = 380mA
6
4
2
10% @ 100Hz
0 _{99% @ 10kHz}
-2
-4
10% @ 10kHz
-6
-8
99% @ 100Hz
-10
4
6
8
10
12
14
16
V_IN (V)
FIGURE 7. 5 LEDs CURRENT ACCURACY vs INPUT VOLTAGE
16
14
3 LEDs
I_LEDpeak = 380mA
12
10
8
6
4
99% @ 10kHz
2
0
99% @ 100Hz
-2
-4
4
5
6
7
8
9
10
V_IN (V)
FIGURE 8. 3 LEDs CURRENT ACCURACY vs INPUT VOLTAGE
400
395
8 LEDs
I_LEDpeak = 380mA
390 DUTY CYCLE = 99%
385
380
375 ^{PWM @ 1kHz}
370
365
360
PWM @ 10kHz
355
PWM @ 100Hz
350
6
8
10
12
14
16
18
V_IN (V)
FIGURE 9. 8 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 99%
410
405
3 LEDs
I_LEDpeak = 380mA
400 DUTY CYCLE = 99%
395
390
385 ^{PWM @ 100Hz}
380
375
370
PWM @ 10kHz
365
360
4
5
6
7
8
9
10
V_IN (V)
FIGURE 11. 3 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 99%
420
415 5 LEDs
410 ^ILEDpeak ^{= 380mA}
405 ^{DUTY CYCLE = 99%}
400
395
390
385
99% @ 10kHz
380
375
370
365
360
99% @ 100Hz
355
350
4
6
8
10
12
14
16
V_IN (V)
FIGURE 10. 5 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 99%
40
39
8 LEDs
I_LEDpeak = 380mA
38 DUTY CYCLE = 10%
PWM @ 100Hz
37
36
35
PWM @ 1kHz
34
PWM @ 10kHz
33
32
31
30
6
8
10
12
14
16
18
V_IN (V)
FIGURE 12. 8 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 10%
5
FN6626.1
December 24, 2013