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TPS79601DRBR Datasheet(PDF) 10 Page - Texas Instruments |
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TPS79601DRBR Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 30 page  OUTPUT VOLTAGE PROGRAMMING GUIDE OUTPUT VOLTAGE R1 R2 C1 GND FB IN OUT EN V IN V OUT R1 C1 R2 TPS79601 1 µF 1.8 V 3.6V 14.0 k Ω 57.9 k Ω 30.1 k Ω 30.1 k Ω 33 pF 15 pF 2.2 µF C1 + (3 x 10–7) x (R1 ) R2) (R1 x R2) R1 + V OUT V REF *1 R2 TPS796 SLVS351O – SEPTEMBER 2002 – REVISED NOVEMBER 2013 www.ti.com The recommended design procedure is to choose Regulator Protection R2 = 30.1k Ω to set the divider current at 40μA, C1 = The TPS796xx PMOS-pass transistor has a built-in 15pF for stability, and then calculate R1 using back diode that conducts reverse current when the Equation 2: 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 (2) limited. If extended reverse voltage operation is anticipated, external limiting might be appropriate. In order to improve the stability of the adjustable version, it is suggested that a small compensation The TPS796xx features internal current limiting and capacitor be placed between OUT and FB. The thermal protection. During normal operation, the approximate value of this capacitor can be calculated TPS796xx limits output current to approximately 2.8A. as Equation 3: When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent (3) gross device failure, care should be taken not to The suggested value of this capacitor for several exceed the power dissipation ratings of the package. resistor ratios is shown in the table in Figure 23. If If the temperature of the device exceeds this capacitor is not used (such as in a unity-gain approximately +165°C, thermal-protection circuitry configuration) then the minimum recommended shuts it down. Once the device has cooled down to output capacitor is 2.2 μF instead of 1μF. below approximately +140°C, regulator operation resumes. Figure 23. TPS79601 Adjustable LDO Regulator Programming 10 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated |
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