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TPS543320 データシート(PDF) 18 Page - Texas Instruments |
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TPS543320 データシート(HTML) 18 Page - Texas Instruments |
18 / 43 page 8.2.1.2 Detailed Design Procedure 8.2.1.2.1 Switching Frequency The first step is to decide on a switching frequency. The TPS543320 can operate at five different frequencies from 500 kHz to 2.2 MHz. The fSW is set by the resistor value from the FSEL pin to ground. Typically the highest switching frequency possible is desired because it produces the smallest solution size. A high switching frequency allows for smaller inductors and output capacitors compared to a power supply that switches at a lower frequency. The main tradeoff made with selecting a higher switching frequency is extra switching power loss, which hurts the efficiency of the regulator. The maximum switching frequency for a given application can be limited by the minimum on-time of the regulator. The maximum fSW can be estimated with Equation 4. Using the maximum minimum on-time of 40 ns and 18-V maximum input voltage for this application, the maximum switching frequency is 2500 kHz. The selected switching frequency must also consider the tolerance of the switching frequency. A switching frequency of 1000 kHz was selected for a good balance of solution size and efficiency. To set the frequency to 1000 kHz, the selected FSEL resistor is 11.8 kΩ per Table 7-1. OUT SW IN V 1 f max tonmin V max u (4) Figure 8-2 shows the maximum recommended input voltage versus output voltage for each FSEL frequency. This graph uses a minimum on-time of 45 ns and includes the 10% tolerance of the switching frequency. A minimum on-time of 45 ns is used in this graph to provide margin to the minimum controllable on-time to ensure pulses are not skipped at no load. At light loads, the dead-time between the low-side MOSFET turning off and high-side MOSFET turning on contributes to the minimum SW node pulse-width. Figure 8-2. Maximum Input Voltage vs Output Voltage TPS543320 SLUSEE1 – DECEMBER 2020 www.ti.com 18 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: TPS543320 |
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同様の説明 - TPS543320 |
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