Datenblatt-Suchmaschine für elektronische Bauteile |
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TS5213CX550RFG Datenblatt(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS5213CX550RFG Datenblatt(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 8 page TS5213 Taiwan Semiconductor Document Number: DS_P0000201 5 Version: G15 APPLICATION INFORMATION (CONTINUE) Thermal Characteristics TS5213 series is designed to provide 80mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junction-ambient thermal resistance of the device and the following basic equation: PD(MAX) = [ TJ(MAX) – TA ] /ΘJA TJ(MAX) is the maximum junction temperature of the die(125 oC), and Ta is the ambient operating temperature. Θ JA is layout dependent, the actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT) * IOUT + VIN * IGND Substituting PD(MAX) for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the TS5213CX550 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: PD(MAX) = (125 oC – 25oC) / 220oC/W PD(MAX) = 455mW The junction to ambient thermal resistance for the minimum footprint is 220 oC/W, the maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 5.0V and an output current of 80mA, the maximum input voltage can be determined. Form the electrical characteristics table, the maximum ground current for 80mA output current is 1mA. 445mW = (VIN – 5.0V ) * 80mA + VIN * 1.8mA 445mW = VIN * 80mA – 5.0 * 80mA + VIN * 1.8mA 445mW = VIN * 80mA – 400mW + VIN * 1.8mA 845mW = VIN * 81.8mA VIN (max) = 10.33V Therefore, a 5.0V application at 80mA of output current can accept a maximum input voltage of 10.33V in a SOT- 25 package. |
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