AS1107WL-T austriamicrosystems, AS1107WL-T Datasheet - Page 15

• Manufacturer Part Number: AS1107WL-T
• Description: IC LED 8-DIGIT DRIVER 24-SOIC
• Manufacturer: austriamicrosystems

Specifications of AS1107WL-T

• Display Type: LED
• Configuration: 7 Segment + DP
• Interface: Serial
• Digits Or Characters: 8 Digits
• Current - Supply: 330mA
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS1107WL-TTR

AS1106, AS1107
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Table 23. R
9.3 Calculating the Power Dissipation
The upper limit for power dissipation (PD) for the AS1106/AS1107 is determined from the following equation:
Where:
V
DUTY is the duty cycle set by intensity register (page 12).
N is the number of segments driven (worst case is 8)
V
I
Dissipation Example:
Thus, for a PDIP package
Where:
T
The T
Table 24. Package Thermal Data
www.austriamicrosystems.com/LED-Driver-ICs/AS1106_07
SEG
AMB
DD
LED
I
SEG
is the supply voltage.
AMB
40
30
20
10
= segment current set by RSET
is the LED forward voltage
= +69.4°C.
(mA)
limit for SO Packages in the dissipation example above is +58.6°C.
SET
24 Narrow DIP
24 Wide SOIC
Package
vs. Segment Current and LED Forward Voltage, V
11.35kΩ
15.4kΩ
23.6kΩ
48.9kΩ
1.5
Θ
JA
I
= +75°C/W (from
SEG
T
PD = 5.25V(1mA) + (5.25V - 1.8V)(31/32 x 40mA x 8) = 1.075W
J,MAX
= 40mA, N = 8, DUTY = 31/32, V
PD = (V
11.12kΩ
15.1kΩ
23.1kΩ
47.8kΩ
= T
2.0
Thermal Resistance (
AMB
DD
Table
+ PD x
x 1mA) + (V
+75°C/W
+85°C/W
24), the maximum allowed T
Θ
JA
10.84kΩ
14.7kΩ
22.6kΩ
46.9kΩ
DD
= 150°C = T
2.5
DD
Revision 2.28
- V
Θ
= 5.0V
LED
JA
LED
)
V
= 1.8V at 40mA, V
)(DUTY x I
LED
AMB
(V)
+1.07W x 75°C/W
AMB
10.49kΩ
14.4kΩ
45.4kΩ
SEG
22kΩ
3.0
is given by:
x N)
DD
= 5.25V
10.2kΩ
13.6kΩ
21.1kΩ
43.8kΩ
3.5
13.1kΩ
20.2kΩ
9.9kΩ
42kΩ
4.0
(EQ 1)
(EQ 2)
(EQ 3)
(EQ 4)
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