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TS39150CZC0 Datasheet(PDF) 7 Page - Taiwan Semiconductor Company, Ltd |
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TS39150CZC0 Datasheet(HTML) 7 Page - Taiwan Semiconductor Company, Ltd |
7 / 12 page TS39150/1/2/3 1.5A Ultra Low Dropout Voltage Regulator with Multi-Function 7/12 Version: D07 Application Information (Continue) Thermal Characteristics TS3915x series linear regulators are simple to use, the most complicated design parameters to consider are thermal characteristics, thermal design requires the following application specification parameters: Maximum ambient temperature, TA Output current, IOUT Output voltage, VOUT Input voltage, VIN Calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet, where the ground current is taken from data sheet. PD = (VIN – VOUT) x IOUT + VIN x IGND The heat sink thermal resistance is determined by: ӨSA = (TJ(MAX) – TA) / PD – (ӨJC + ӨCS) Where TJ(MAX) ≤ 125oC and ӨCS is between 0oC and 2oC/W. The heat sink may by significantly reduced in applications where the minimum input voltage is know and is large compared with the dropout voltage and distribute the heat between this resistor and the regulator. The low dropout properties of vertical PNP regulators allow significant reductions in regulator power dissipation and the associated heat sink without compromising performance. When this technique is employed, a capacitor of at least 1uF is needed directly between the input and regulator ground. |
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