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TPS76130DBV Datasheet(PDF) 9 Page - Texas Instruments |
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TPS76130DBV Datasheet(HTML) 9 Page - Texas Instruments |
9 / 11 page TPS76130, TPS76132, TPS76133, TPS76138, TPS76150 LOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS SLVS178A – DECEMBER 1998 – REVISED FEBRUARY 1999 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION 1 3 5 TPS761xx IN EN OUT 2 CI = 1 µF Co = 4.7 µF GND Figure 17. TPS761xx Typical Application over current protection The over current protection circuit forces the TPS761xx into a constant current output mode when the load is excessive or the output is shorted to ground. Normal operation resumes when the fault condition is removed. NOTE: An overload or short circuit may also activate the over temperature protection if the fault condition persists. over temperature protection The thermal protection system shuts the TPS761xx down when the junction temperature exceeds 160 °C. The device recovers and operates normally when the temperature drops below 150 °C. input capacitor A 1- µF or larger ceramic decoupling capacitor with short leads connected between IN and GND is recommended. The decoupling capacitor may be omitted if there is a 1 µF or larger electrolytic capacitor connected between IN and GND and located reasonably close to the TPS761xx. However, the small ceramic device is desirable even when the larger capacitor is present, if there is a lot of high frequency noise present in the system. output capacitor Like all low dropout regulators, the TPS761xx requires an output capacitor connected between OUT and GND to stabilize the internal control loop. The minimum recommended capacitance value is 4.7 µF and the ESR (equivalent series resistance) must be between 0.1 Ω and 10 Ω. Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic capacitors are all suitable, provided they meet the requirements described above. Most of the commercially available 4.7- µF surface-mount solid-tantalum capacitors, including devices from Sprague, Kemet, and Nichicon, meet the ESR requirements stated above. Multilayer ceramic capacitors should have minimum values of 4.7 µF over the full operating temperature range of the equipment. enable (EN) A logic zero on the enable input shuts the TPS761xx off and reduces the supply current to less than 1 µA. Pulling the enable input high causes normal operation to resume. If the enable feature is not used, EN should be connected to IN to keep the regulator on all of the time. The EN input must not be left floating. reverse current path The power transistor used in the TPS761xx has an inherent diode connected between IN and OUT as shown in the functional block diagram. This diode conducts current from the OUT terminal to the IN terminal whenever IN is lower than OUT by a diode drop. This condition does not damage the TPS761xx provided the current is limited to 150 mA. |
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