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ACPL-K49U Datasheet(PDF) 9 Page - AVAGO TECHNOLOGIES LIMITED |
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ACPL-K49U Datasheet(HTML) 9 Page - AVAGO TECHNOLOGIES LIMITED |
9 / 9 page For product information and a complete list of distributors, please go to our web site: www.avagotech.com Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries. Data subject to change. Copyright © 2005-2012 Avago Technologies. All rights reserved. AV02-3826EN - October 2, 2012 Figure 12. Test Circuit for Transient Immunity and Typical Waveforms (4-Pin Configuration) 8 7 6 5 1 2 3 4 IF VCC RL VO CL = 15 pF VFF + – VCM Pulse Gen. 5 V VCM VO tr tf VOL 10% 90% 10% 90% Tr = tf = 80 ns Switch at IF = 0 mA VO Switch at IF = 4 mA 1500 V Thermal Resistance Model for ACPL-K49U The diagram of ACPL-K49U for measurement is shown in Figure 13. Here, one die is heated first and the tempera- tures of all the dice are recorded after thermal equilib- rium is reached. Then, the 2nd die is heated and all the dice temperatures are recorded. With the known ambient temperature, the die junction temperature and power dissipation, the thermal resistance can be calculated. The thermal resistance calculation can be cast in matrix form. This yields a 2 by 2 matrix for our case of two heat sources. R11 R12 X P1 = T1 R21 R22 P2 T2 1 2 3 4 8 7 6 5 Die 1: LED Die 2: Detector Figure 13, Diagram of ACPL-K49U for measurement R11: Thermal Resistance of Die1 due to heating of Die1 R12: Thermal Resistance of Die1 due to heating of Die2. R21: Thermal Resistance of Die2 due to heating of Die1. R22: Thermal Resistance of Die2 due to heating of Die2. P1: Power dissipation of Die1 (W). P2: Power dissipation of Die2 (W). T1: Junction temperature of Die1 due to heat from all dice (°C). T2: Junction temperature of Die2 due to heat from all dice. Ta: Ambient temperature. T1: Temperature difference between Die1 junction and ambient (°C). T2: Temperature deference between Die2 junction and ambient (°C). T1 = (R11 x P1 + R12 x P2) + Ta T2 = (R21 x P1 + R22 x P2) + Ta Measurement data on a low K board: R11 = 160°C/W, R12 = R21 = 74°C/W, R22 = 115°C/W |
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