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AS1100WL-TZ Datasheet(PDF) 10 Page - ams AG

Part # AS1100WL-TZ
Description  Serially Interfaced, 8-Digit LED Driver
Download  12 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS1100WL-TZ Datasheet(HTML) 10 Page - ams AG

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Data Sheet AS1100
Revision 1.32, Oct. 2004
Page 10 of 12
Computing Power Dissipation
The upper limit for power dissipation (PD) for the AS1100 is determined from the following equation:
PD = (VDD x 0.5mA) + (VDD - VLED)(DUTY x ISEG x N)
where:
VDD = supply voltage
DUTY = duty cycle set by intensity register
N = number of segments driven (worst case is 8)
VLED = LED forward voltage
ISEG = segment current set by RSET
Dissipation Example:
ISEG = 40mA, N = 8, DUTY = 31/32, VLED = 1.8V at 40mA, VDD = 5.25V
PD = 5.25V(0.5mA) + (5.25V - 1.8V)(31/32 x 40mA x 8) = 1.07W
Thus, for a PDIP package
θJA = +75°C/W (from Table 13), the maximum allowed ambient temperature TA is given by:
TJ,MAX = TA + PD x
θJA = 150°C = TA +1.07W x 75°C/W.
where TA = +69.7°C.
The TA limit for SO Packages in the dissipation example above is +59.0°C.
Package Information
Inches
Millimeters
Dim Min
Max
Min
Max
A
0.093 0.104 2.35
2.65
A1 0.004 0.012 0.10
0.30
B
0.014 0.019 0.35
0.49
C 0.009 0.013 0.23
0.32
D 0.598 0.614 15.20
15.60
e
0.050
1.27
E
0.291 0.299 7.40
7.60
H 0.394 0.419 10.00
10.65
L
0.016 0.050 0.40
1.27
Figure 4: SOIC-24 package dimensions


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