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TPS78833 Datasheet(PDF) 7 Page - Texas Instruments |
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TPS78833 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 9 page TPS78825, TPS78833 SLVS382A – JUNE 2001 – REVISED JULY 2001 7 www.ti.com APPLICATION INFORMATION external capacitor requirements (continued) The external bypass capacitor, used in conjunction with an internal resistor to form a low-pass filter, should be a low ESR ceramic capacitor. For example, the TPS78833 exhibits only 56 µVRMS of output voltage noise using a 0.01 µF ceramic bypass capacitor and a 10-µF ceramic output capacitor. Note that the output will start up slower as the bypass capacitance increases due to the RC time constant at the bypass pin that is created by the internal 150-k Ω resistor and external capacitor. power dissipation and junction temperature 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: P D(max) + T J max * T A RθJA Where: TJmax is the maximum allowable junction temperature. RθJA is the thermal resistance junction-to-ambient for the package, see the dissipation rating table. TA is the ambient temperature. The regulator dissipation is calculated using: P D + V I * V O I O Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the thermal protection circuit. regulator protection The TPS788xx PMOS-pass transistor has a built-in back diode that conducts reverse current 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. If extended reverse voltage operation is anticipated, external limiting might be appropriate. The TPS788xx features internal current limiting and thermal protection. During normal operation, the TPS78833 limits output current to approximately 350 mA. 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 approximately 165 °C, thermal-protection circuitry shuts it down. Once the device has cooled down to below approximately 140 °C, regulator operation resumes. |
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