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TPS79525DCQRG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS79525DCQRG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 23 page www.ti.com PROGRAMMING THE TPS79501 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) TPS79501 GND FB IN OUT EN V IN V OUT R 1 C 1 R 2 1 F m 1 F m OUTPUTVOLTAGE PROGRAMMINGGUIDE 1.8V 3.6V 14.0k W 57.9k W 30.1k W 30.1k W 33pF 15pF OUTPUT VOLTAGE R 1 R 2 C 1 TPS795xx SLVS350G – OCTOBER 2002 – REVISED JULY 2006 The approximate value of this capacitor can be ADJUSTABLE LDO REGULATOR calculated as Equation 3: The output voltage of the TPS79501 adjustable regulator is programmed using an external resistor divider as shown in Figure 24. The output voltage is The suggested value of this capacitor for several calculated using Equation 1: resistor ratios is shown in the table within Figure 24. If this capacitor is not used (such as in a unity-gain configuration), then the minimum recommended output capacitor is 2.2 µF instead of 1 µF. where: • VREF = 1.2246 V typ (the internal reference voltage) The TPS795xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the Resistors R1 and R2 should be chosen for input voltage drops below the output voltage (for approximately 40- µA divider current. Lower value example, during power down). Current is conducted resistors can be used for improved noise from the output to the input and is not internally performance, but the device wastes more power. limited. If extended reverse voltage operation is Higher values should be avoided, as leakage current anticipated, external limiting might be appropriate. at FB increases the output voltage error. The TPS795xx features internal current limiting and The recommended design procedure is to choose thermal protection. During normal operation, the R2 = 30.1 kΩ to set the divider current at 40 µA, TPS795xx limits output current to approximately 2.8 C1 = 15 pF for stability, and then calculate R1 using A. When current limiting engages, the output voltage Equation 2: 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. In order to improve the stability of the adjustable If the temperature of the device exceeds version, it is suggested that a small compensation approximately 165 °C, thermal-protection circuitry capacitor be placed between OUT and FB. shuts it down. Once the device has cooled down to below approximately 140 °C, regulator operation resumes. Figure 24. TPS79501 Adjustable LDO Regulator Programming 9 Submit Documentation Feedback |
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