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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM5145 датащи(PDF) 40 Page - Texas Instruments |
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LM5145 датащи(HTML) 40 Page - Texas Instruments |
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40 / 69 page  10.2 Typical Applications For step-by-step design procedure, circuit schematics, bill of materials, PCB files, simulation, and test results of an LM25143-powered implementation, see the TI Designs reference design library. 10.2.1 Design 1 – 5-V and 3.3-V Dual-Output Buck Regulator for Computing Applications Figure 10-4 shows the schematic diagram of a dual-output synchronous buck regulator with output voltages setpoints of 3.3 V and 5 V and a rated load current of 7 A for each output. In this example, the target half-load and full-load efficiencies are 91% and 90%, respectively, based on a nominal input voltage of 12 V that ranges from 3.5 V to 36 V. The switching frequency is set at 2.1 MHz by resistor RRT. The 5-V output is connected to VCCX to reduce IC bias power dissipation and improve efficiency. VOUT2 = 5 V IOUT2 = 7 A VIN = 3.5 V...36 V (12 V nom) SS2 RES DEMB AGND SS1 COMP2 PGND2 VOUT2 CS2 LO2 SW2 HO2 HB2 VIN COMP1 PGND1 VOUT1 CS1 LO1 SW1 HO1 HB1 VCC PG1 HOL1 LOL1 HOL2 LOL2 EN1 EN2 VCCX RT VDDA PG2 SYNCOUT VIN VIN LM25143 * VOUT1 tracks VIN if VIN < 3.7 V VOUT2 tracks VIN if VIN < 5.4 V CHF2 RCOMP2 LO1 CO2 CIN CSS1 CCOMP2 CSS2 CRES CVDDA CHF1 LO2 CO1 RS2 RS1 Q2 Q1 Q4 Q3 RHO2 RHO1 CDITH DITH RRT 0.47 F 4 10 F 8 10 nF 4 47 F 15 pF 10 nF 1 nF 7 m 0.68 H 15 pF 4 47 F 7 m 0.68 H 2.2 F 10.5 k 24.9 k RCOMP1 CCOMP1 1 nF 20 k 0 0 CVCC2 2.2 F CVCC1 FB2 FB1 MODE VDDA CVCCX 2.2 F VOUT1 = 3.3 V IOUT1 = 7 A DB1 0.1 F CBST1 0.1 F CBST2 DB2 68 nF 68 nF 0.22 F Figure 10-4. Application Circuit 1 With LM25143 Dual-Output Buck Regulator at 2.1 MHz Note This and subsequent design examples are provided herein to showcase the LM25143 controller in several different applications. Depending on the source impedance of the input supply bus, an electrolytic capacitor can be required at the input to ensure stability, particularly at low input voltage and high output current operating conditions. See Section 10 for more details. LM25143 SNVSC10 – MARCH 2022 www.ti.com 40 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LM25143 |
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