ISL78100 Datasheet, PDF (6/19 Pages) Intersil Corporation – High Power LED Driver

ISL78100
Typical Performance Curves (Continued)
41
5 LEDs
40 ^ILEDpeak ^{= 380mA}
DUTY CYCLE = 10%
39
10% @ 100Hz
38
37
36
10% @ 10kHz
35
34
6
8
10
12
14
16
18
V_IN (V)
FIGURE 13. 5 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 10%
42
41
3 LEDs
I_LEDpeak = 380mA
40 _{DUTY CYCLE = 10%}
PWM @ 100Hz
39
38
37
36
35
34
PWM @ 10kHz
33
32
4
5
6
7
8
9
10
V_IN (V)
FIGURE 14. 3 LEDs LINE REGULATION OF PWM DUTY
CYCLE OF 10%
400
RSET = 0.5Ω
350 _{DUTY CYCLE = 100%}
300
250
5 LED
8 LED
200
150
100
50
3 LED
0
0
0.2
0.4
0.6
0.8
1.0
V_LEVEL (V)
FIGURE 15. LED CURRENT vs V_LEVEL BIAS
0.1000
EN/PWM = 0
V_LEVEL = 1V
T_A = +25°C
0.0100
0.0010
0.0001
6
8
10
12
14
16
18
V_IN (V)
FIGURE 16. QUIESCENT CURRENT (NON-SWITCHING)
8 LEDs
VIN
I_LED = 350mA
LX
IL
FB
FIGURE 17. START-UP WAVEFORMS
8 LEDs
VIN
I_LED = 350mA
LX
IL
FB
FIGURE 18. START-UP WAVEFORMS ZOOM-IN
6
FN6626.0
December 17, 2007