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TPS79518DCQR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS79518DCQR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 33 page TPS795 www.ti.com SLVS350I – OCTOBER 2002 – REVISED MAY 2015 7.3 Feature Description 7.3.1 Shutdown The enable pin (EN) is active high and is compatible with standard and low-voltage TTL-CMOS levels. When shutdown capability is not required, EN can be connected to IN. 7.3.2 Start-Up The TPS795 uses a start-up circuit to quickly charge the noise reduction capacitor, CNR, if present (see Functional Block Diagrams). This circuit allows for the combination of very low output noise and fast start-up times. The NR pin is high impedance so a low leakage CNR capacitor must be used; most ceramic capacitors are appropriate for this configuration. For the fastest start-up, apply VIN first, and then drive the enable pin (EN) high. If EN is tied to IN, start-up is somewhat slower. To ensure that CNR is fully charged during start-up, use a 0.1-μF or smaller capacitor. 7.3.3 Undervoltage Lockout (UVLO) The TPS795 uses an undervoltage lockout circuit to keep the output shut off until internal circuitry is operating properly. The UVLO circuit has approximately 100 mV of hysteresis to help reject input voltage drops when the regulator first turns on. 7.3.4 Regulator Protection The TPS795 PMOS-pass transistor has a built-in back diode that conducts reverse current when the input voltage drops below the output voltage (for example, 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 TPS795 features internal current limiting and thermal protection. During normal operation, the TPS795 limits output current to approximately 2.8 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 approximately 165°C (Tsd), thermal-protection circuitry shuts it down. Once the device has cooled down to less than approximately 140°C, regulator operation resumes. Copyright © 2002–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS795 |
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