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IRU431LCL3 Datasheet(PDF) 5 Page - International Rectifier |
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IRU431LCL3 Datasheet(HTML) 5 Page - International Rectifier |
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5 / 6 page  IRU431L / IRU431AL 5 Rev. 1.8 02/20/02 www.irf.com Thermal Design The IRU431L is offered in the surface mount SOT-23 (L) packages. The SOT-23 package has the maximum power dissipation capability of 150mW at TA=25 °C with the de- rating factor of -1.2mW / °C. The table below summarizes the maximum power dissi- pation capability of each package versus ambient tem- perature. Ambient Temperature (TA) - 88C Pkg 25 40 50 60 70 SOT-23 150mW 132mW 120mW 108mW 96mW In our previous example, the maximum power dissipa- tion of the device is calculated under no load and maxi- mum input supply condition. The maximum power is calculated using the following equation: As shown in the power dissipation table, both packages can handle this power dissipation. PMAX = VKA 3 oo pp Where: PMAX = Maximum power dissipation of the 431L For our example: PMAX = 3.3 3 oo pp=89mW VMAX - VKA RB 6 - 3.3 100 Stability The IRU431L has many different domains of stability as a function of the cathode current. As is typical of three- terminal shunt regulators, the IRU431L has many do- mains of stability. The actual domain in which any prac- tical circuit operates is related to cathode current. In general the device will be unconditionally stable for any cathode current if a capacitor, 1 mF or larger, is connected between the cathode and the anode. If the cathode cur- rent is always higher than 3mA under minimum line and maximum load conditions, the capacitor value can be reduced to 0.01 mF and the system will be stable. |
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