ADM8843
TYPICAL PERFORMANCE CHARACTERISTICS
35
30
20.35
20.30
–40 ° C
20.25
25
20.20
20
15
20.15
20.10
+25 ° C
+85 ° C
10
20.05
5
4.75
6.75
8.75
10.75
12.75
14.75
20.00
2.6
3.1
3.6
4.1
4.6
5.1
5.6
20.24
20.22
R SET (k Ω )
Figure 3. I LED (mA) vs. R SET
SUPPLY VOLTAGE (V)
Figure 6. I LED (mA) vs. Temperature (°C), Four LEDs Enabled
35
30
20.20
25
20.18
20.16
20.14
20
15
20.12
10
20.10
20.08
–40
0
40
TEMPERATURE ( ° C)
80
5
2.6
3.0
3.4
3.8 4.2 4.6
SUPPLY VOLTAGE (V)
5.0
5.4
Figure 4. I LED (mA) Variation over Temperature (°C), V CC = 3.6 V
20
16
95
90
85
Figure 7. I LED (mA) vs. Supply Voltage (V)
80
12
75
8
70
4
65
0
0
20
40 60
DUTY CYCLE (%)
80
100
60
0
10
20
30
40 50 60
DUTY CYCLE (%)
70
80
90
100
Figure 5. I LED (mA) vs. PWM Dimming (Varying Duty Cycle),
Four LEDs Enabled, Frequency = 1 kHz
Rev. C | Page 6 of 16
Figure 8. LED Efficiency vs. Varying Duty Cycle of 1 kHz PWM Signal,
Four LEDs Enabled, 20 mA/LED
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