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LM25183 bảng dữ liệu(PDF) 10 Page - Texas Instruments |
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LM25183 bảng dữ liệu(HTML) 10 Page - Texas Instruments |
10 / 39 page 0 50 100 150 200 250 300 350 400 0 20 40 60 80 100 % Total Rated Output Power Discontinuous conduction mode (DCM) Boundary conduction mode (BCM) Frequency foldback mode (FFM) V OUT SW FB VIN EN/UVLO TC GND SS/BIAS RSET LM25183 C OUT C IN T 1 V IN N P : NS D FLY R SET R FB R TC C SS R UV1 R UV2 D CLAMP D F D OUT 10 LM25183 SNVSBJ3 – APRIL 2020 www.ti.com Product Folder Links: LM25183 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated Feature Description (continued) Figure 15. LM25183 Flyback Converter Schematic (Optional Components in Red) 7.3.2 PSR Flyback Modes of Operation The LM25183 uses a variable-frequency, peak current-mode (VFPCM) control architecture with three possible modes of operation as illustrated in Figure 16. Figure 16. Three Modes of Operation Illustrated by Variation of Switching Frequency With Load The LM25183 operates in boundary conduction mode (BCM) at heavy loads. The power MOSFET turns on when the current in the secondary winding reaches zero, and the MOSFET turns off when the peak primary current reaches the level dictated by the output of the internal error amplifier. As the load is decreased, the frequency increases to maintain BCM operation. Equation 1 gives the duty cycle of the flyback converter in BCM. |
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