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TPS79430DGNTG4 Fiches technique(PDF) 9 Page - Texas Instruments |
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TPS79430DGNTG4 Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 23 page www.ti.com PROGRAMMING THE TPS79401 C 1 + (3 10*7) (R 1 ) R2) (R 1 R 2) (3) V OUT + VREF 1 ) R 1 R 2 (1) REGULATOR PROTECTION R 1 + V OUT V REF * 1 R 2 (2) OUTPUT VOLTAGE PROGRAMMING GUIDE OUTPUT VOLTAGE R1 R2 C1 1.8 V 3.6 V 14.0 k Ω 61.9 k Ω 30.1 k Ω 30.1 k Ω 22 pF 15 pF TPS79401 GND FB IN OUT EN V IN V OUT 1 µF 2.2 µF R1 R2 C1 TPS794xx SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 In order to improve the stability of the adjustable ADJUSTABLE LDO REGULATOR version, it is suggested that a small compensation capacitor be placed between OUT and FB. The output voltage of the TPS79401 adjustable regulator is programmed using an external resistor The approximate value of this capacitor can be divider as shown in Figure 23. The output voltage is calculated as Equation 3: calculated using Equation 1: The suggested value of this capacitor for several resistor ratios is shown in the table within Figure 23. where: If this capacitor is not used (such as in a unity-gain • V REF = 1.2246 V typ (the internal reference configuration), then the minimum recommended voltage) output capacitor is 2.2 µF instead of 1 µF. Resistors R1 and R2 should be chosen for approximately 40- µA divider current. Lower value resistors can be used for improved noise The TPS794xx PMOS-pass transistor has a built-in performance, but the device wastes more power. back diode that conducts reverse current when the Higher values should be avoided, as leakage current input voltage drops below the output voltage (for at FB increases the output voltage error. example, during power down). Current is conducted from the output to the input and is not internally The recommended design procedure is to choose limited. If extended reverse voltage operation is R2 = 30.1 kΩ to set the divider current at 40 µA, anticipated, external limiting might be appropriate. C1 = 15 pF for stability, and then calculate R1 using Equation 2: The TPS794xx features internal current limiting and thermal protection. During normal operation, the TPS794xx 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, thermal-protection circuitry shuts it down. Once the device has cooled down to below approximately 140 °C, regulator operation resumes. Figure 23. TPS79401 Adjustable LDO Regulator Programming 9 Submit Documentation Feedback |
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