UCC28951
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ZHCSIQ7A –AUGUST 2018 –REVISED DECEMBER 2021
T
SW(nom)
T
ABSET2
OUTA
OUTB
OUTC
T
ABSET1
T
SW(osc)
T
CDSET2
T
CDSET1
OUTD
I
PR
V
x(1-D) /D
OUT
OUT
V
I
LOUT
V
LOUT
I
OUT
图8-1. Phase-Shifted Converter Waveforms
OUTE
(CCM Mode)
OUTF
(CCM Mode)
OUTE and OUTF are disabled if VCS < VDCM
OUTE and OUTF are disabled if VCS < VDCM
OUTE
OUTF
Burst Mode at light load with TMIN maintaining ZVS
(The time scale is different versus above diagram)
Transformer
Winding
Magnetizing
Current
图8-2. Major Waveforms During Transitions Between Different Operating Modes
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English Data Sheet: SLUSDB2
40
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