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TPS76801QPWPR Datasheet(PDF) 17 Page - Texas Instruments |
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TPS76801QPWPR Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 22 page  www.ti.com REGULATOR PROTECTION POWER DISSIPATION AND JUNCTION TEMPERATURE P D(max) + T J max * TA R q JA where: TJmax is the maximum allowable junction temperature. TA is the ambient temperature. RθJA is the thermal resistance junction-to-ambient for the package, i.e., 172°C/W for the 8-terminal SOIC and 32.6 °C/W for the 20-terminal PWP with no airflow. (3) P D + V I * V O I O (4) TPS76815Q, TPS76818Q, TPS76825Q TPS76827Q, TPS76828Q, TPS76830Q TPS76833Q, TPS76850Q, TPS76801Q SLVS211J – JUNE 1999 – REVISED OCTOBER 2004 APPLICATION INFORMATION (continued) The TPS768xx PMOS-pass transistor has a built-in back diode that conducts reverse currents when the input voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the input and is not internally limited. When extended reverse voltage is anticipated, external limiting may be appropriate. The TPS768xx also features internal current limiting and thermal protection. During normal operation, the TPS768xx limits output current to approximately 1.7 A. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. If the temperature of the device exceeds 150 °C (typ), thermal-protection circuitry shuts it down. Once the device has cooled below 130°C (typ), regulator operation resumes. Specified regulator operation is assured to a junction temperature of 125 °C; the maximum junction temperature should be restricted to 125 °C under normal operating conditions. This restriction limits the power dissipation the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max). The maximum-power-dissipation limit is determined using the following equation: The regulator dissipation is calculated using: Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the thermal protection circuit. 17 |
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