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LM5145 Datasheet(PDF) 39 Page - Texas Instruments |
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LM5145 Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 60 page  7.2.2 Design 2 – High-Efficiency, 440kHz, Synchronous Buck Regulator The following figure shows the schematic diagram of a single-output synchronous buck regulator with an output voltage of 3.3V and a rated load current of 12A. In this example, the current is sensed using a resistor placed in series with the output inductor. The switching frequency is set at 440kHz by resistor RT. The 3.3V output voltage is achieved by connecting FB directly to VCC. FPWM/SYNC AGND PGND VOUT ISNS LO SW HO CBOOT VIN COMP VCC PG EN RT LM25139 FB RT RCOMP CCOMP CHF CVCC CBOOT CIN COUT RS LO VIN = 5.5V...36V VOUT = 3.3V IOUT = 12A High = FPWM Low = PFM Q2 Q1 VCC 4 47 F 15nF 2 10 F 6.04k 100pF 1.5 H 53.6k 4.7 F 3m 0.1 F Figure 7-13. Application Circuit 2 With the LM25139 Buck Regulator at 440kHz www.ti.com LM25139 SLVSJ80 – OCTOBER 2025 Copyright © 2025 Texas Instruments Incorporated Submit Document Feedback 39 Product Folder Links: LM25139 |
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