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LM3753 Datasheet(PDF) 13 Page - Texas Instruments |
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LM3753 Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 49 page  LG1 VDD SW2 DEADTIME CONTROL OV Fault OC Fault Prebias PWM COMPARATOR CURRENT LIMIT COMPARATOR A = 1 CURRENT SENSE AMPLIFIER HG2 BOOT2 DRIVER CONTROL PGND LG2 CSM CS2 ILIM - + VCC VDD VIN FEED-FORWARD BANDGAP REFERENCE 1.39V INTERNAL SS SWITCH DOWN DURING FAULT RESTART VREF = 0.6V Closed for Master Controller MASTER VCC - 1.2V IAVE1 = 2 mA/V OVP 780 mV 480 mV UVP A = 3.125 PWM 1 + + + - COMP STARTUP AND FAULT LOGIC IFAULT = 300 PA 4.14V OVER TEMP 4.02V VDD VCC POWER_OK EN VIN TRACK FB COMP IAVE REGULATORS, SUPPLY UVLO NBASE PH PGOOD OSCILLATOR, PLL, PWM RAMP PWM 1 PWM 2 A To D SYNCOUT FREQ SYNC PWM 2 + + + - COMP VDD SW1 DEADTIME CONTROL OV Fault OC Fault Prebias PWM COMPARATOR CURRENT LIMIT COMPARATOR A = 1 CURRENT SENSE AMPLIFIER HG1 BOOT1 DRIVER CONTROL PGND CS1 ILIM 15 mV VCS1 - VCSM + 15 mV 32 1 2 3 27 6 7 8 9 5 30 28 25 18 19 23 15 26 VCC 13 10 11 12 24 31 14 16 4 VCC VCC VCC VCC VCC 1.3V 2.8V 1.3V 2.8V CSM - + 15 mV 29 IILIM = 100 PA VCC IAVE2 = 2 mA/V KFF = 0.232 V/V VDD R R + - R R DIFFERENTIAL AMPLIFIER SNSP SNSM VDIF SGND 17 20 21 22 Closed for Master Controller VCS2 - VCSM + 15 mV A = 50 A = 50 FAULT LM3753 www.ti.com SNVS614B – DECEMBER 2009 – REVISED MARCH 2013 BLOCK DIAGRAM FUNCTIONAL DESCRIPTION GENERAL The LM3753 is a two-phase voltage-mode step-down (buck) switching regulator controller. From one to six LM3753 controllers can be connected together to control from two to twelve phases (2, 3, 4, 5, 6, 8, 10, or 12 phases). Since external switching components can typically handle 25A per phase, a 12 phase system can supply a total of 300A. Multiple controllers in a system communicate with each other and work together. They will startup and shut down together, each phase on each controller will share current equally, and all the phases will react in unison to fault conditions. In a multi-controller system, all controllers are the same part. One controller functions as the Master and all the others act as Slaves. The Master and Slave are differentiated by how they are connected in the system. The Master controller senses the system output voltage and VIN (as well as TRACK) and sets the target duty cycle for each phase on all of the controllers. The Master and Slave controllers monitor the current-sense information from each phase. Based on this current information, the controllers adjust the duty cycle on each phase up or down from the target level, in order to achieve optimal current sharing. Each controller incorporates a phase locked loop (PLL) that communicates with the PLLs on the other controllers. By this means, the switching edges of the different phases are spread out equally within one switch period. For N phases operating at any switching frequency, the angle in degrees between one phase switching and the next is 360° / N. A SYNC pin is available that can be used to lock the Master switching frequency and phase to an external clock. Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: LM3753 |
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