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TPS79601KTTT Datasheet(PDF) 9 Page - Texas Instruments |
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TPS79601KTTT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 33 page www.ti.com Regulator Protection R1 + V OUT V REF *1 R2 (2) C1 + (3 x 10–7) x (R1 ) R2) (R1 x R2) (3) 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 TPS796xx SLVS351I – SEPTEMBER 2002 – REVISED MAY 2006 The recommended design procedure is to choose 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 (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. 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 as Equation 3: 2.8A. 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 The suggested value of this capacitor for several not to exceed the power dissipation ratings of the resistor ratios is shown in the table below (see package. If the temperature of the device exceeds Figure 23). If this capacitor is not used (such as in a approximately +165 °C, thermal-protection circuitry unity-gain configuration) then the minimum shuts it down. Once the device has cooled down to recommended output capacitor is 2.2 µF instead of below approximately +140 °C, regulator operation 1 µF. resumes. Figure 23. TPS79601 Adjustable LDO Regulator Programming 9 Submit Documentation Feedback |
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