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CPA, CPD Series Data Sheet
?
200 – 550 Watt
CompactPCI ?
AC-DC and DC-DC Converters
transitional resonant switching technique and proprietary
leading and trailing-edge pulse-width modulation. It has a
proven track record in high-availability power solutions.
The switching frequency is typically 135 kHz. Some models
(CPx200/250 version V117, CPA500/550 version V110) exhibit
a crystal oscillator with 131 kHz.
All models have a separate auxiliary supply for the primary
circuits, the CPD500 as well for the secondary circuits. The
secondary bias voltage of the other models is generated by
the forward converters. Only the forward converters are
controlled by the inhibit and enable inputs; see Auxiliary
Functions.
+DCIN
46
JM041a
V i
–DCIN
C Y
+
C b
Forward
converter
≈ 135 kHz
+
C Y
ORing
FET
V o1
+
47
45
RTN
(22)
INH#
39
EN#
C Y
V PBias
Inhibit
logic
Auxiliary
con-
verter
Forward
converter
≈ 135 kHz
Forward
converter
≈ 135 kHz
V SBias
+
C Y
+
C Y
ORing
FET
ORing
FET
V o2
V o3
+
+
27
Fig. 1b
Block diagram of CPD500 models.
For the pin allocation, see Mechanical Data.
+
ORing
diode
V o4
–
+
C Y
ACN
46
2 nd fuse
(option F)
JM014b
V i
C Y
C b +
Forward
converter
≈ 135 kHz
+
ORing
FET
V o1
+
ACL
47
Inrush
current
C Y
45
C Y
limiter
V PBias
Auxiliary
Forward
converter
≈ 135 kHz
+
C Y
ORing
FET
V o2
+
con-
RTN
(22)
INH#
39
EN#
Inhibit
logic
verter
Forward
converter
≈ 135 kHz
V SBias
+
C Y
ORing
FET
V o3
+
27
Fig. 1c
Block diagram of CPA500/550 models.
+
C Y
ORing
diode
V o4
–
+
For the pin allocation, see Mechanical Data.
BCD20005-G Rev. AG2, 20-Dec-2012
Page 4 of 19
www.power-one.com
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