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LM5145 Datasheet(PDF) 31 Page - Texas Instruments |
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LM5145 Datasheet(HTML) 31 Page - Texas Instruments |
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31 / 69 page  9.3.17.3 Single-Output Multiphase Operation To configure the LM25143 for multiphase operation (three or four phases), two LM25143 controllers are required. See Figure 9-10. Configure the first controller (CNTRL1) as a primary and the second controller (CNTRL2) as a secondary. To configure the second controller as a secondary, connect the MODE and FB2 pins to VDDA. This disables both feedback error amplifiers of the secondary controller, placing them in a high-impedance state. Connect COMP1 and COMP2 of the primary and secondary together. Connect SS1 and SS2 of the primary and secondary together. Connect SYNCOUT of the primary controller to DEMB (SYNCIN) of the secondary. The SYNCOUT of the primary controller is 90° out-of-phase and facilitates interleaved operation. RT is not used for the oscillator when the LM25143 is in secondary mode but instead used for slope compensation. Therefore, select the RT resistance to be the same as that of the primary. The oscillator is derived from the primary controller. FPWM or DEM mode for the secondary is set by connecting its FB1 to VDDA or AGND, respectively. FPWM or DEM mode of the primary controller is set by its DEMB pin. See Table 9-3. The LM25143 in single-output multiphase operation does not support phase shedding when the output voltage is set between 0.6 V to 1.5 V. See the Benefits of a Multiphase Buck Converter White Paper and Multiphase Buck Design From Start to Finish Application Report for more information. Table 9-3. Single-Output Multiphase Operation Mode FB1 (Secondary) FB2 (Secondary) DEM or FPWM (Secondary) VDDA AGND VDDA DEM VDDA VDDA VDDA FPWM CNTRL1 Primary/Secondary VIN 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 LM25143 LO1 CO2 CIN CSS CRES1 CVDD1 LO2 CO1 RS2 RS1 RHO2 RHO1 CDITH DITH RRT1 CVCC2 CVCC1 FB2 FB1 MODE VDDA VDDA CNTRL2 Secondary VIN SS2 RES DEMB AGND SS1 COMP2 PGND2 VOUT2 CS2 LO2 SW2 HO2 HB2 VIN PGND1 VOUT1 CS1 LO1 SW1 HO1 HB1 VCC PG1 HOL1 LOL1 HOL2 LOL2 EN1 EN2 VCCX RT VDDA PG2 SYNCOUT LM25143 LO3 CO4 CIN CRES2 CVDD2 LO4 CO3 RS4 RS3 RHO4 RHO3 DITH RRT2 VOUT CVCC4 CVCC3 FB2 FB1 MODE VDDA VDDA COMP1 VDDA CVCCX1 CVCCX2 CHF RCOMP CCOMP Figure 9-10. Multiphase Regulator Schematic Configured for Single-Output Interleaved Operation Note A design with five or more phases (using three or more LM25143 controllers) is feasible when appropriately phase-shifted clock signals are available. For example, a 6-phase design requires three LM25143 controllers with 0°, 60°, and 120° external SYNC signals to achieve the ideal phase separation of 360° divided by the total number of phases. www.ti.com LM25143 SNVSC10 – MARCH 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 31 Product Folder Links: LM25143 |
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