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TLV751 Scheda tecnica(PDF) 16 Page - Texas Instruments |
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TLV751 Scheda tecnica(HTML) 16 Page - Texas Instruments |
16 / 31 page IN OUT GND EN ½ TLV751P V OUT V IN FB C IN C OUT V EN R 2 R 1 16 TLV751 SBVS385B – DECEMBER 2019 – REVISED APRIL 2020 www.ti.com Product Folder Links: TLV751 Submit Documentation Feedback Copyright © 2019–2020, Texas Instruments Incorporated 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information 8.1.1 Adjustable Device Feedback Resistors Figure 38 shows that the output voltage of the TLV751 can be adjusted from 0.55 V to 5.5 V by using a resistor divider network. Figure 38. Adjustable Operation The adjustable-version device requires external feedback divider resistors to set the output voltage. VOUT is set using the feedback divider resistors, R1 and R2, according to the following equation: VOUT = VFB × (1 + R1 / R2) (2) For this device, VFB = 0.55 V. To ignore the FB pin current error term in the VOUT equation, set the feedback divider current to 100x the FB pin current listed in the Electrical Characteristics table. This setting provides the maximum feedback divider series resistance, as shown in the following equation: R1 + R2 ≤ VOUT / (IFB × 100) (3) For this device, IFB = 10 nA. 8.1.2 Input and Output Capacitor Selection The TLV751 requires an output capacitance of 0.47 µF or larger for stability. Use X5R- and X7R-type ceramic capacitors because these capacitors have minimal variation in value and equivalent series resistance (ESR) over temperature. When choosing a capacitor for a specific application, pay attention to the dc bias characteristics for the capacitor. Higher output voltages cause a significant derating of the capacitor. For best performance, the maximum recommended output capacitance is 220 µF. Although an input capacitor is not required for stability, good analog design practice is to connect a capacitor from IN to GND. Some input supplies have a high impedance, thus placing the input capacitor on the input supply helps reduce the input impedance. This capacitor counteracts reactive input sources and improves transient response, input ripple, and PSRR. If the input supply has a high impedance over a large range of frequencies, several input capacitors can be used in parallel to lower the impedance over frequency. Use a higher-value capacitor if large, fast, rise-time load transients are anticipated, or if the device is located several inches from the input power source. |
Codice articolo simile - TLV751_V01 |
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Descrizione simile - TLV751_V01 |
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