Diodes AL5812 - Manual (Page 4)

AL5812
Document number: DS35616 Rev. 2 - 2
4 of 11
www.diodes.com
November 2013
© Diodes Incorporated
NEW PROD
UC
T
AL5812
Typical Performance Characteristics
145
140
120
100
60
40
20
0
80
0 5 10 15 20 25 30 35 40 45 50 55 60
INPUT VOLTAGE (V)
Figure 1 LED Current vs. Input Voltage
L
E
D
C
U
R
R
E
N
T (
m
A)
V = 1.2V
T = +25°C
LED
A
R = 4.99k
SET
Ω
R = 7.5k
SET
Ω
R = 12.4k
SET
Ω
-40 -25 -10 5
TEMPERATURE (°C)
Figure 2 LED Current vs. Ambient Temperature
20 35 50 65 80 95 110 125
L
E
D
C
U
R
R
E
N
T
(
m
A)
R = 4.99k
SET
Ω
R = 7.5k
SET
Ω
R = 12.4k
SET
Ω
V = 1.2V
V = 3.5V
LED
CC
160
140
120
100
80
60
40
20
0
0 5 10 15 20 25 30
LED VOLTAGE (V)
Figure 3 LED Current vs. LED Pin Voltage (Note 11)
L
E
D CURRE
NT
(
m
A)
V = 3.5V
T = +25°C
IN
A
R = 4.99k
SET
Ω
R = 7.5k
SET
Ω
R = 12.4k
SET
Ω
0 0.5 1.0 1.5 2.0 2.5 3.0
LED VOLTAGE (V)
Figure 4 LED Current vs. LED Pin Voltage Zoomed
LE
D
C
U
R
R
EN
T
(m
A
)
160
140
120
100
80
60
40
20
0
V = 3.5V
T = +25°C
IN
A
R = 12.4k
SET
Ω
R = 4.99k
SET
Ω
R = 7.5k
SET
Ω
0 5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
Figure 5 LED Current vs. Input Voltage - 2 LEDs
(Note 11 & 12)
160
140
120
100
80
60
40
20
0
L
E
D CUR
RE
NT
(
m
A)
T = +25°C
A
2 LEDs
R = 12.4k
SET
Ω
R = 4.99k
SET
Ω
R = 7.5k
SET
Ω
0 2 4 6 8 10 12 14 16 18 20 22
INPUT VOLTAGE (V)
Figure 6 LED Current vs. Input Voltage
2 LEDs - High Side Drive (Notes 11, 12 &13)
LE
D
C
U
R
R
E
N
T
(m
A
)
160
140
120
100
80
60
40
20
0
T = +25°C
V
pin tied to LED pin
2 LEDs
A
CC
R = 12.4k
SET
Ω
R = 4.99k
SET
Ω
R = 7.5k
SET
Ω
Notes: 11. These curves have been limited at larger input voltages due to power dissipation.
12. Lower input voltage range is limited by the LED chain voltage
13. The AL5812 has its V
CC
pin connected to its LED pin, which are connected to the positive input supply voltage. R
SET
is connected to AL5812 GND
pin, which is connected to the anode of the LED chain. This creates a high side driver of the LED chain. See Figure 15.