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TPS715A30DRVR Datasheet(PDF) 8 Page - Texas Instruments |
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TPS715A30DRVR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 20 page V OUT + VREF 1 ) R1 R2 R1 + V OUT V REF * 1 R2 OUTPUT VOLTAGE PROGRAMMING GUIDE OUTPUT VOLTAGE R1 R2 1.8 V 2.8 V 5.0 V 392 M Ω 1.07 M Ω 2.55 M Ω 806 k Ω 806 k Ω 806 k Ω VOUT VIN FB R1 R2 GND IN TPS715A01 0.1 µF 0.47 µF OUT TPS715Axx SBVS047E – MAY 2004 – REVISED JUNE 2011 www.ti.com Programming the TPS715A01 Adjustable LDO Regulator The output voltage of the TPS715A01 adjustable regulator is programmed using an external resistor divider as shown in Figure 15. The output voltage is calculated using Equation 3: (3) where: VREF = 1.205V typ (the internal reference voltage) Resistors R1 and R2 should be chosen for approximately 1.5 μA divider current. Lower value resistors can be used for improved noise performance, but the solution consumes more power. Higher resistor values should be avoided as leakage current into/out of FB across R1/R2 creates an offset voltage that artificially increases/decreases the feedback voltage and thus erroneously decreases/increases VO. The recommended design procedure is to choose R2 = 1M Ω to set the divider current at 1.5μA, and then calculate R1 using Equation 4: (4) Figure 15. TPS715A01 Adjustable LDO Regulator Programming 8 Copyright © 2004–2011, Texas Instruments Incorporated |
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