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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FS8855 датащи(PDF) 11 Page - Fortune Semiconductor Corp. |
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FS8855 датащи(HTML) 11 Page - Fortune Semiconductor Corp. |
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11 / 14 page  FS8855 Rev. 2.7 11/14 If the FS8855 uses a SOT-89 package and this package is mounted on a double sided printed circuit board with two square inches of copper allocated for “heat spreading”, the resulting θJA is 180°C/W. Based on a maximum operating junction temperature 125°C with an ambient temperature of 25°C, the maximum power dissipation will be: () () W T T P CA JC A J MAX 555 . 0 180 25 125 = − = + − = θ θ Thermal characteristics were measured using a double sided board with 1” x 2” square inches of copper area connected to the GND pin for “heat spreading”. Input-Output Voltage A regulator’s minimum input-output voltage differential, or dropout voltage, determines the lowest usable supply voltage. In battery-powered systems, this will determine the useful end-of-life battery voltage. The FS8855 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source on-resistance (RDS(ON)) multiplied by the load current. VDROPOUT = VIN-VOUT = RDS(ON) x IOUT |
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