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AS1104-T

P1-P3P4-P6P7-P9P10-P12P13-P13
www.austriamicrosystems.com Revision 1.5 7 - 13
AS1101/AS1102/AS1103/AS1104
Data Sheet - Typical Performance Characteristics
Figure 9. AS1102, AS1103, AS1104 ILED vs. RSET, Figure 10. AS1102, AS1103, AS1104 ILED vs. RSET;
VSET = 3V VSET = 3V
Figure 11. AS1101 I
LED vs. RSET; VSET = 3V Figure 12. ILED vs. Temp; VLED = -0.25V, ISET = 50µA
Figure 13. AS1101 I
LED vs. ISET Figure 14. AS1102, AS1103, AS1104 ILED vs. ISET
4
6
8
10
12
14
16
18
20
22
0 20 40 60 80 100 120 140 160
R
SET
(k
Ω)
I
LED
(mA) e
0
5
10
15
20
25
30
35
0 20406080100120140160180200
R
SET
(k
Ω)
I
LED
(mA) e
VSAT = 0.6V
VSAT = 0.3V
VSAT = 0.5V
VSAT = 0.4V
VSAT = 1V
VSAT = 0.15V
VSAT = 0.6V
VSAT = 0.3V
4
6
8
10
12
14
16
18
20
22
0 20 40 60 80 100 120 140 160
R
SET
(k
Ω)
I
LED
(mA) e
VSAT = 0.6V
VSAT = 0.3V
VSAT = 0.5V
VSAT = 0.4V
2
4
6
8
10
12
14
16
18
20
22
10 20 30 40 50 60 70 80 90 100
R
SET
(k
Ω)
I
LED
(mA) e
VSAT = 0.30V
VSAT = 0.05V
VSAT = 0.10V
VSAT = 0.15V
VSAT = 0.20V
VSAT = 0.25V
11
11.5
12
12.5
13
-40 -20 0 20 40 60 80 100
Temperature (°C)
I
LED
(mA) e
0
10
20
30
40
50
60
70
80
90
0 20 40 60 80 100 120 140 160
I
SET
(µA)
I
LED
(mA) e
0
5
10
15
20
25
30
35
40
45
0 20 40 60 80 100 120 140 160
I
SET
(µA)
I
LED
(mA) e
www.austriamicrosystems.com Revision 1.5 8 - 13
AS1101/AS1102/AS1103/AS1104
Data Sheet - Typical Performance Characteristics
Figure 15. AS1101 vs. RSET Figure 16. AS1102, AS1103, AS1104 ILED vs. VIN
Figure 17. Control Voltage Transient Response Figure 18. Enable Voltage Transient Response
0
10
20
30
40
50
60
3.0 3.5 4.0 4.5 5.0
V
IN
(V)
I
LED
(mA) e
0
10
20
30
40
50
60
3.0 3.5 4.0 4.5 5.0
V
IN
(V)
I
LED
(mA) e
LED Type 1
LED Type 2
AS11011
RSET
CTRL Voltage
2V/Div 10mA/Div
Enable Voltage
2V/Div 10mA/Div
LED Current
LED Current
1µs/Div 1µs/Div
www.austriamicrosystems.com Revision 1.5 9 - 13
AS1101/AS1102/AS1103/AS1104
Data Sheet - Application Information
8 Application Information
Figure 19. Typical Application Diagrams
Setting the LED Current
The current going into the LEDs is approximately OCMR times greater then the current ISET. LED current is controlled
by V
SET and RSET (see Figure 19) according to the formula:
ILED = OCMR x (VSET - VCTRL)/RSET (EQ 1)
For VSET = 3V and a specific LED current, the value of RSET can be determined using the graphs shown in Figure 9,
Figure 10, and Figure 11 on page 7. For any other option, the value of I
SET can be determined using the graph in
Figure 3 on page 6.
Note: LED brightness can also be adjusted by driving pin ENABLE or pin CTRL with a PWM signal.
4 Diode Control with Enable
3 Diode Control with Enable
AS1103
4 Diode Control
V
IN
AS1101
ISET
2 Diode Control with Enable
V
IN
RSET
ENABLE
VSET
(3V)
VSAT
GND
GND
CTRL
I3/I4
I1/I2
ON
I
SET
RSET
VSET
(3V)
CTRL
VSATI1 I2 I3 I4
AS1102
ISET
VIN
RSET
ENABLE
VSET
(3V)
GND
CTRL
ON
VSATI1 I2 I3
AS1104
VIN
GND
VSATI1 I2 I3 I4
ISET
RSET
ENABLE
VSET
(3V)
CTRL
ON
P1-P3P4-P6P7-P9P10-P12P13-P13

AS1104-T

Mfr. #:
Buy AS1104-T
Manufacturer:
ams
Description:
LED Lighting Drivers
Lifecycle:
New from this manufacturer.
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