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TPS71256DRCRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS71256DRCRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 21 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, TPS71219 TPS71229, TPS71247 TPS71256, TPS71257 SBVS049D – MAY 2004 – REVISED AUGUST 2010 www.ti.com PROGRAMMING THE TPS71202 ADJUSTABLE LDO REGULATOR (3) The output voltage of the TPS71202 dual adjustable blank regulator is programmed using an external resistor The suggested value of this capacitor for several divider, as shown in Figure 25. The output voltage is resistor ratios is shown in Figure 25. If this capacitor calculated using Equation 1: is not used (such as in a unity-gain configuration) or if an output voltage ≤ 1.8 V is chosen, then the (1) minimum recommended output capacitor is 4.7 mF instead of 2.2 mF. where VREF = 1.225 V (the internal reference voltage). DROPOUT VOLTAGE Resistors R2 and R4 should be chosen for The TPS712xx uses a PMOS pass transistor to approximately a 40 mA divider current. Lower value achieve extremely low dropout. When (VIN - VOUT) is resistors can be used for improved noise less than the dropout voltage (VDO), the PMOS pass performance, but will consume more power. Higher device is in its linear region of operation and the values should be avoided because leakage current at input-to-output resistance is the RDS, ON of the PMOS FB increases the output voltage error. The pass element. Dropout voltages at lower currents can recommended design procedure is to choose R2 = be approximated by calculating the effective RDS, ON 30.1 k Ω to set the divider current at 40 mA, and then of the pass element and multiplying that resistance by calculate R1 using Equation 2: the load current. RDS, ON of the pass element can be obtained by dividing the dropout voltage by the rated output current. For the TPS71256, the RDS, ON of the (2) pass element is 84 m Ω. The dropout voltage of the To improve the stability and noise performance of the TPS712xx will be less for higher output voltage adjustable version, a small compensation capacitor versions. This is because the PMOS pass element can be placed between OUT and FB. will have lower on-resistance due to increased gate drive. For voltages ≤ 1.8 V, the value of this capacitor should be 100 pF. For voltages > 1.8 V, the approximate value of this capacitor can be calculated as Equation 3: Figure 25. TPS71202 Adjustable LDO Regulator Programming 10 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Link(s): TPS71202 TPS71219 TPS71229 TPS71247 TPS71256 TPS71257 |
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