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TPS79228DBVR Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS79228DBVR Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 19 page TPS79201, TPS79225 TPS79228, TPS79230 SLVS337B – MARCH 2001 – REVISED MAY 2002 www.ti.com 10 OUTPUT VOLTAGE PROGRAMMING GUIDE VO VI OUT FB R1 R2 GND EN IN ≤ 0.7 V ≥ 2 V TPS79201 1 µF BYPASS 0.01 µF 1 µF C1 22 pF 15 pF 15 pF OUTPUT VOLTAGE R1 R2 2.5 V 3.3 V 3.6 V C1 33.4 k Ω 53.6 k Ω 59 k Ω 30.1 k Ω 30.1 k Ω 30.1 k Ω Figure 23. TPS79201 Adjustable LDO Regulator Programming REGULATOR PROTECTION The TPS792xx 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 TPS792xx features internal current limiting and thermal protection. During normal operation, the TPS792xx limits output current to approximately 400 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 or the absolute maximum voltage ratings of the device. 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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