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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TPS71202-EP Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS71202-EP Fiches technique(HTML) 10 Page - Texas Instruments |
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10 / 19 page  C1 + (3 105) (R1 ) R2) (R1 R2) (pF) V OUT + VREF 1 ) R1 R2 R1 + V OUT V REF * 1 R2 VOUT 1.225 V 1.5 V 2.5 V 3.0 V 3.3 V 4.75 V R1/R3 Short 7.15 k Ω 31.6 k Ω 43.2 k Ω 49.9 k Ω 86.6 k Ω R2/R4 Open 30.1 k Ω 30.1 k Ω 30.1 k Ω 30.1 k Ω 30.1 k Ω Output Voltage Programming Guide C1/C2 Open 100 pF 22 pF 15 pF 15 pF 15 pF TPS71202 GND EN2 FB2 NR IN OUT1 FB1 EN1 OUT2 V IN V OUT1 V OUT2 0.1 µF 2.2 µF 2.2 µF 0.01 µF C1 R1 C2 R3 R2 R4 TPS71202-EP SGLS395A – OCTOBER 2008 – REVISED SEPTEMBER 2010 www.ti.com PROGRAMMING THE TPS71202 For voltages ≤ 1.8 V, the value of this capacitor ADJUSTABLE LDO REGULATOR should be 100 pF. For voltages > 1.8 V, the approximate value of this capacitor can be calculated The output voltage of the TPS71202 dual adjustable as Equation 3: regulator is programmed using an external resistor divider, as shown in Figure 24. The output voltage is calculated using Equation 1: (3) blank (1) The suggested value of this capacitor for several where VREF = 1.225 V (the internal reference resistor ratios is shown in Figure 24. If this capacitor voltage). is not used (such as in a unity-gain configuration) or if an output voltage ≤ 1.8 V is chosen, then the Resistors R2 and R4 should be chosen for minimum recommended output capacitor is 4.7 mF approximately a 40-mA divider current. Lower value instead of 2.2 mF. resistors can be used for improved noise performance but consume more power. Higher values DROPOUT VOLTAGE should be avoided because leakage current at FB increases the output voltage error. The recommended The TPS712xx uses a PMOS pass transistor to design procedure is to choose R2 = 30.1 k Ω to set achieve extremely low dropout. When (VIN - VOUT) is the divider current at 40 mA, and then calculate R1 less than the dropout voltage (VDO), the PMOS pass using Equation 2: device is in its linear region of operation and the input-to-output resistance is the RDS, ON of the PMOS pass element. Dropout voltages at lower currents can (2) be approximated by calculating the effective RDS, ON of the pass element and multiplying that resistance by To improve the stability and noise performance of the the load current. RDS, ON of the pass element can be adjustable version, a small compensation capacitor obtained by dividing the dropout voltage by the rated can be placed between OUT and FB. output current. Figure 24. Adjustable LDO Regulator Programming 10 Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): TPS71202-EP |
Numéro de pièce similaire - TPS71202-EP |
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Description similaire - TPS71202-EP |
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