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TPS54622 Datasheet(PDF) 24 Page - Texas Instruments |
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TPS54622 Datasheet(HTML) 24 Page - Texas Instruments |
24 / 42 page 8.2.2 Detailed Design Procedures 8.2.2.1 Custom Design With WEBENCH® Tools Click here to create a custom design using the TPS54622-EP device with the WEBENCH® Power Designer. 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 Operating Frequency The first step is to decide on a switching frequency for the regulator. There is a trade off between higher and lower switching frequencies. Higher switching frequencies may produce smaller a solution size using lower valued inductors and smaller output capacitors compared to a power supply that switches at a lower frequency. However, the higher switching frequency causes extra switching losses, which hurt the converter’s efficiency and thermal performance. In this design, a moderate switching frequency of 480 kHz is selected to achieve both a small solution size and a high-efficiency operation. 8.2.2.3 Output Inductor Selection To calculate the value of the output inductor, use Equation 18. KIND is a coefficient that represents the amount of inductor ripple current relative to the maximum output current. The inductor ripple current is filtered by the output capacitor. Therefore, choosing high inductor ripple currents impact the selection of the output capacitor since the output capacitor must have a ripple current rating equal to or greater than the inductor ripple current. In general, the inductor ripple value is at the discretion of the designer; however, KIND is normally from 0.1 to 0.3 for the majority of applications. f - = × × × Vinm ax Vout Vout L1 Io Kind Vinm ax sw (18) For this design example, use KIND = 0.3 and the inductor value is calculated to be 3.08 µH. For this design, a nearest standard value was chosen: 3.3 µH. For the output filter inductor, it is important that the RMS current and saturation current ratings not be exceeded. The RMS and peak inductor current can be found from Equation 20 and Equation 21. f - = × × Vinmax Vout Vout Iripple L1 Vinmax sw (19) ( ) 2 2 1 12 f æ ö × - = + ×ç ÷ ç ÷ × × è ø o V Vinmax Vo ILrms Io Vinmax L1 sw (20) 2 = + Iripple ILpeak Iout (21) TPS54622-EP SLVSFN6 – DECEMBER 2020 www.ti.com 24 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: TPS54622-EP |
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