Datasheet

ADM8843
Rev. C | Page 6 of 16
TYPICAL PERFORMANCE CHARACTERISTICS
5
10
15
20
25
30
35
10.75
05050-004
R
SET
(kΩ)
LED CURRENT (mA)
4.75 6.75 12.75 14.758.75
Figure 3. I
LED
(mA) vs. R
SET
05050-005
TEMPERATURE (°C)
LED CURRENT (mA)
–40 0 8040
20.08
20.12
20.14
20.16
20.18
20.20
20.24
20.10
20.22
Figure 4. I
LED
(mA) Variation over Temperature (°C), V
CC
= 3.6 V
0
4
8
12
16
20
05050-006
DUTY CYCLE (%)
LED CURRENT (mA)
0 20 60 1008040
Figure 5. I
LED
(mA) vs. PWM Dimming (Varying Duty Cycle),
Four LEDs Enabled, Frequency = 1 kHz
20.00
20.10
20.15
20.20
20.25
20.30
20.35
4.1
05050-007
SUPPLY VOLTAGE (V)
LED CURRENT (mA)
2.6 3.1 4.6 5.63.6 5.1
–40°C
+25°C
+85°C
20.05
Figure 6. I
LED
(mA) vs. Temperature (°C), Four LEDs Enabled
5
10
15
20
25
30
35
3.8
05050-008
SUPPLY VOLTAGE (V)
LED CURRENT (mA)
2.6 3.0 4.6 5.43.4 5.04.2
Figure 7. I
LED
(mA) vs. Supply Voltage (V)
60
65
70
80
90
95
05050-009
DUTY CYCLE (%)
EFFICIENCY (%)
04060807050
85
90 100
10 20
30
75
Figure 8. LED Efficiency vs. Varying Duty Cycle of 1 kHz PWM Signal,
Four LEDs Enabled, 20 mA/LED