HA16163T Datasheet, PDF (15/30 Pages) Renesas Technology Corp – Synchronous Phase Shift Full-Bridge Control IC

HA16163T
Synchronous Phase Shift Full-Bridge Control
The HA16163 is provided with full-bridge control outputs OUT-A through OUT-D, and secondary-side synchronous
rectification control outputs OUT-E and OUT-F. ZVS (Zero Voltage Switching) can be performed by adjusting timing
delays T_D1 and T_D2 between the OUT-A through OUT-D outputs by means of an external resistance. OUT-E and OUT-
F have an output timing suitable for secondary-side full-wave rectification, and so can be used in either current doubler
or center tap applications. The following figure shows full-bridge ZVS + current doubler operation using an ideal
model.
RES pulse
(Internal signal)
SA
Full-bridge
SB
control switch
(on when high) _SC
SD
TD1
TD2
Synchronous SE
rectification
control switch
TD3
(on when high) SF
Transformer
primary
both-side
voltage
VIN
0
–VIN
Transformer
secondary
both-side
VIN/N
0
–VIN/N
voltage
Subinterval:
1
2
3
4
5
Time: t0
t1
t2
t3
t4
t5
Figure 10
• Subinterval:1
In interval 1, SA and SD are turned on, and VIN is generated on the transformer primary side. On the transformer
secondary side, a value proportional to the winding ratio is generated, and the primary-side power is transmitted to
the load side.
At this time, secondary-side switch SE is off and SF is on.
VIN
L1
SA
V11
Lr
Cr1 ^SB
SC
SE
V12
VOUT
SD _Cr2
SF
L2
Subinterval: 1
Rev.5.0, Mar.15.2004, page 15 of 29