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UCC28950 Datasheet(PDF) 36 Page - Texas Instruments |
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UCC28950 Datasheet(HTML) 36 Page - Texas Instruments |
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36 / 45 page  I OUT V OUT x (1-D) / D V OUT T ON = 0.5 x D x T SW(nom) I LOUT V LOUT V DS QF V DS QE I PR T AFSET2 T AFSET1 T BESET1 T BESET2 T ABSET1 T CDSET2 T ABSET2 T SW(nom) T SW(osc) OUTE OUTF OUTD OUTC OUTB OUTA T CDSET1 UCC28950 SLUSA16A – MARCH 2010 – REVISED JULY 2010 www.ti.com APPLICATION INFORMATION UCC28950 Application Description The efficiency improvement of phase-shifted full-bridge DC/DC converter with UCC28950 is achieved by using the synchronous rectification technique, control algorithm providing ZVS condition over the entire load current range, accurate adaptive timing of the control signals between primary and secondary FETs and special operating modes at light load for the highest efficiency and power saving. The simplified electrical diagram of this converter is shown in Figure 47. The controller device is located on the secondary side of converter, although it could be located on primary side as well. The location on secondary side allows easy power system level communication and better handling of some transient conditions that require fast direct control of the synchronous rectifier MOSFETs. The power stage includes primary side MOSFETs, QA, QB, QC, QD and secondary side synchronous rectifier MOSFETs, QE and QF. For example, for the 12-V output converters in server power supplies use of the center-tapped rectifier scheme with L-C output filter is a popular choice. To maintain high efficiency at different output power conditions, the converter operates in nominal synchronous rectification mode at mid and high output power levels, with transitioning to the diode rectifier mode at light load and further followed by the burst mode, as the output power becomes even lower. All these transitions are based on the current sensing on the primary side using the current sense transformer in this specific case. Figure 47. Major Waveforms of Phase-Shifted Converter 36 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UCC28950 |
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