Manual

EIGHT-CHANNEL CONSTANT CURRENT SINK WITH CURRENT MATCH AP3608E
7
Mar. 2011 Rev. 1. 5 BCD Semiconductor Manufacturing Limited
Data Sheet
0 20406080100
0
2
4
6
8
10
12
14
16
18
20
Current per Channel (mA)
Duty Cycle (%)
-60 -40 -20 0 20 40 60 80 100 120 140
18.0
18.5
19.0
19.5
20.0
20.5
21.0
21.5
22.0
Current per Channel (mA)
Temperature (
o
C)
R
ISET
=23K
Parameter Symbol Conditions Min Typ Max Unit
Enable Section
EN Pin High Level Threshold Voltage V
IH_EN
1.8 V
EN Pin Low Level Threshold Voltage V
IL_EN
0.8 V
PWM Dimming Section
PWM High Level Threshold Voltage V
IH_PWM
1.8 V
PWM Low Level Threshold Voltage V
IL_PWM
0.8 V
Interface Section
SDB High Level Output Voltage V
OH
2.4 V
SDB Low Level Output Voltage V
OL
0.4 V
Feedback Output Current I
FB
515 µA
Total Device
Self-check Voltage @ Open LED V
CHECK
3.0 V
Thermal Shutdown Temperature T
OTSD
160
o
C
Thermal Shutdown Hysteresis T
HYS
20
o
C
Electrical Characteristics (Continued)
Limits in standard typeface are guaranteed for V
IN
=V
EN
=5V, R
ISET
=8kΩ,, T
A
=25
o
C, unless otherwise specified.
Typical Performance Characteristics
V
IN
=V
EN
=5V, R
ISET
=8kΩ,, T
A
=25
o
C, unless otherwise specified.
Figure 4. Current per Channel vs. Temperature
Figure 5. Current per Channel vs. Duty Cycle