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TLE4309G Datasheet(PDF) 10 Page - Infineon Technologies AG |
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TLE4309G Datasheet(HTML) 10 Page - Infineon Technologies AG |
10 / 12 page Datasheet 10 Rev. 1.0, 2007-03-20 TLE4309 4. Calculating the maximum power dissipation: For calculating the maximum power dissipation, the minimum forward voltage sum of the LEDs connected in series V F,MIN,total (= No.ofLEDs* VF,MIN) , the maximum supply voltage V I,MAX , the IC current consumption Iq,MAX , as well as the the maximum output current I Q,MAX needs to be considered. Hence, the maximum power dissipation PD,MAX calculates: P D,MAX = (VI,MAX - VF,MIN,total)* IQ,MAX + VI,MAX * Iq,MAX With assuming a maximum current consumption of 15 mA @ I Q = 260 mA, the maximum power dissipation for the example is 1.28 W. 5. Thermal Resistance needed: The thermal resistance from junction to ambient R th,j-a calculates: R th,j-a = (Tj,max - Ta,max) / PD,MAX With allowing a junction temperature of 150 °C, the R th,j-a needed in our example would be 50 K/W. In case some copper area on the PCB is used as a heat sink, the area needed is approximately 6 cm 2 (board in horizontal position, no airflow). If the area is not available, several via holes to the GND-layer or to a heatsink area on the PCB backside help to distribute the heat. For additional information on the thermal resistance see Infineon’ s special subject book “Thermal Resistance - Theory and Practice” including extended package information. |
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