ISL78100 Datasheet, PDF (4/19 Pages) Intersil Corporation – High Power LED Driver

ISL78100
Typical Performance Curves
100
8 LEDs
95 ^ILEDpeak ^{= 380mA}
90 _50%@1kHz
85
99%@100Hz
80
50%@100Hz
75 ^99%@1kHz 10%@1kHz
99%@10kHz
10%@10kHz
70
50%@10kHz
65
10%@100Hz
60
6
8
10
12
14
16
18
V_IN (V)
FIGURE 1. 8 LEDs EFFICIENCY vs INPUT VOLTAGE vs
DIMMING FREQUENCY AND DUTY CYCLE
100
5 LEDs
95 I_LEDpeak = 380mA
90
99% @ 10kHz
85
80
75
99% @ 100Hz
70
10% @ 10kHz
65
10% @ 100Hz
60
4
6
8
10
12
14
16
V_IN (V)
FIGURE 2. 5 LEDs EFFICIENCY vs INPUT VOLTAGE vs
DIMMING FREQUENCY AND DUTY CYCLE
100
3 LEDs
95 ^ILEDpeak ^{= 380mA}
90
99%@100Hz
99%@10kHz
85
80
75
10%@10kHz
70
65
10%@100Hz
60
4
6
8
10
V_IN (V)
FIGURE 3. 3 LEDs EFFICIENCY vs INPUT VOLTAGE vs
DIMMING FREQUENCY AND DUTY CYCLE
100
95
90
8 LEDs
85
5 LEDs
80
75
I_LEDpeak = 380mA
70
PWM = 10kHz
65
8 LEDs, V_IN = 12V
5 LEDs, V_IN = 9V
60
0
20
40
60
80
100
PWM DIMMING DUTY CYCLE (%)
FIGURE 4. 8 AND 5 LEDs EFFICIENCY vs PWM DUTY CYCLE
400
I_LEDpeak = 380mA
350 _{8 LEDs, VIN = 12V}
300
5 LEDs, V_IN = 9V
3 LEDs, V_IN = 5V
250
5 LEDs @ 100Hz
3 LEDs @ 100Hz
200
8 LEDs @ 1kHz
150
8 LEDs @ 10kHz
100
50
5 LEDs @ 10kHz
0
0
20
40
60
80
100
PWM DIMMING DUTY CYCLE (%)
FIGURE 5. LEDs PWM DIMMING LINEARITY
4
3
8 LEDs
I_LEDpeak = 380mA
2
1
10% @ 100Hz
0
-1
-2
10% @ 10kHz
-3
-4
99% @ 10kHz
-5
99% @ 100Hz
-6
6
8
10
12
14
16
18
V_IN (V)
FIGURE 6. 8 LEDs CURRENT ACCURACY vs INPUT VOLTAGE
4
FN6626.0
December 17, 2007