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TPS7A4001MDGNREP Datasheet(PDF) 11 Page - Texas Instruments |
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TPS7A4001MDGNREP Datasheet(HTML) 11 Page - Texas Instruments |
11 / 23 page Where: V OUT R + R 1 2 ≥10 µA, and V OUT V REF – 1 R = R 1 2 TPS7A4001-EP OUT FB GND C 10 µF IN R 1 C 10 nF BYP C 10 F OUT µ IN EN V IN V OUT R 2 V EN TPS7A4001-EP www.ti.com SBVS226 – AUGUST 2015 8.2 Typical Application Figure 14. Example Circuit to Maximize Transient Performance 8.2.1 Design Requirements For this design example, use the following parameters listed in Table 2. Table 2. Design Parameters PARAMETER VALUE VIN 12 V, with 55 V surge tolerance VOUT 5 V (ideal), 4.981 (actual) IOUT 28 mA Accuracy 5 % R1, R2 162 k Ω, 49.9 kΩ 8.2.2 Detailed Design Procedure The maximum value of total feedback resistance can be calculated to be 500 k Ω. Equation 1 was used to calculate R1 and R2, and standard 1% resistors were selected to keep the accuracy within the 5% allocation. 10- uF ceramic input and output capacitors were selected, along with a 10-nF bypass capacitor for optimal AC performance. 8.2.2.1 Capacitor Recommendations Low equivalent series resistance (ESR) capacitors should be used for the input, output, and bypass capacitors. Ceramic capacitors with X7R and X5R dielectrics are required. Ceramic X7R capacitors offer improved voltage and temperature coefficients, while ceramic X5R capacitors are the most cost-effective and are available in higher values. NOTE High ESR capacitors may degrade PSRR. 8.2.2.2 Input and Output Capacitor Requirements The TPS7A4001-EP device high voltage linear regulator achieves stability with a minimum output capacitance of 4.7 µF and input capacitance of 1 µF; however, TI highly recommends to use 10- μF output and input capacitors to maximize AC performance. 8.2.2.3 Bypass Capacitor Requirements Although a bypass capacitor (CBYP) is not needed to achieve stability, TI highly recommends using a 10-nF bypass capacitor to maximize AC performance (including line transient, noise, and PSRR). For additional information regarding the performance improvements of using a bypass capacitor, see . 8.2.2.4 Transient Response As with any regulator, increasing the size of the output capacitor reduces overshoot and undershoot magnitude but increases the duration of the transient response. The presence of the CBYP capacitor may greatly improve the line transient response of the TPS7A4001-EP device, as shown in Figure 1. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS7A4001-EP |
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