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TLV62569 Datasheet(PDF) 10 Page - Texas Instruments |
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TLV62569 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 24 page ÷ ø ö ç è æ + ´ = ÷ ø ö ç è æ + ´ = 2 1 1 6 . 0 2 1 1 R R V R R V V FB OUT 10 TLV62569, TLV62569P SLVSDG1B – DECEMBER 2016 – REVISED JUNE 2017 www.ti.com Product Folder Links: TLV62569 TLV62569P Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated (1) Inductor tolerance and current de-rating is anticipated. The effective inductance can vary by +20% and -30%. (2) Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance can vary by +20% and -50%. (3) This LC combination is the standard value and recommended for most applications. 1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements. 2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial. 3. Compare the generated design with other possible solutions from Texas Instruments. The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time pricing and component availability. In most cases, these actions are available: • Run electrical simulations to see important waveforms and circuit performance • Run thermal simulations to understand board thermal performance • Export customized schematic and layout into popular CAD formats • Print PDF reports for the design, and share the design with colleagues Get more information about WEBENCH tools at www.ti.com/WEBENCH. 8.2.2.2 Setting the Output Voltage An external resistor divider is used to set output voltage according to Equation 2. When sizing R2, in order to achieve low current consumption and acceptable noise sensitivity, use a maximum of 200 kΩ for R2. Larger currents through R2 improve noise sensitivity and output voltage accuracy but increase current consumption. (2) A feed forward capacitor, C3 improves the loop bandwidth to make a fast transient response (shown in Figure 19). 6.8-pF capacitance is recommended for R2 of 100-kΩ resistance. A more detailed discussion on the optimization for stability vs. transient response can be found in SLVA289. 8.2.2.3 Output Filter Design The inductor and output capacitor together provide a low-pass filter. To simplify this process, Table 4 outlines possible inductor and capacitor value combinations. Checked cells represent combinations that are proven for stability by simulation and lab test. Further combinations should be checked for each individual application. Table 4. Matrix of Output Capacitor and Inductor Combinations VOUT [V] L [µH](1) COUT [µF] (2) 4.7 10 22 2 x 22 100 0.6 ≤ VOUT < 1.2 1 + 2.2 ++(3) 1.2 ≤ VOUT < 1.8 1 + + 2.2 ++(3) + 1.8 ≤ VOUT 1 + + + 2.2 ++(3) + + |
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