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AS1100WE Datasheet(PDF) 10 Page - ams AG |
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AS1100WE Datasheet(HTML) 10 Page - ams AG |
10 / 12 page 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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