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TLS850F1TAV50 Datasheet(PDF) 31 Page - Infineon Technologies AG |
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TLS850F1TAV50 Datasheet(HTML) 31 Page - Infineon Technologies AG |
31 / 35 page TLS850F1TAV50 Application Information Data Sheet 31 Rev. 1.0, 2016-02-04 TLS850F1TAV50 is designed to be also stable with low ESR capacitors. According to the automotive requirements, ceramic capacitors with X5R or X7R dielectrics are recommended. The output capacitor should be placed as close as possible to the regulator’s output and GND pins and on the same side of the PCB as the regulator itself. In case of rapid transients of input voltage or load current, the capacitance should be dimensioned in accordance and verified in the real application that the output stability requirements are fulfilled. 6.3 Thermal Considerations Knowing the input voltage, the output voltage and the load profile of the application, the total power dissipation can be calculated: P D =(VI - VQ)× IQ + VI × Iq (2) with • P D: continuous power dissipation • V I : input voltage • V Q: output voltage • I Q: output current • I q: quiescent current The maximum acceptable thermal resistance R thJA can then be calculated: R thJA,max =( Tj,max - Ta )/ PD (3) with • T j,max: maximum allowed junction temperature • T a: ambient temperature Based on the above calculation the proper PCB type and the necessary heat sink area can be determined with reference to the specification in “Thermal Resistance” on Page 9. Example Application conditions: V I = 13.5 V V Q = 5 V I Q = 200 mA T a = 85 °C Calculation of R thJA,max: P D =(VI – VQ)× IQ + VI × Iq ( V I × Iq can be neglected because of very low Iq) =(13.5 V–5V) × 200mA =1.7 W R thJA,max =(Tj,max – Ta)/ PD = (150 °C – 85 °C) / 1.7 W = 38.24 K/W |
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