BCM4414xG0F4440yzz
Dielectric Withstand
ZHI_EQ1
ZLO_EQ1
The chassis of the BCM in a VIA package is required to be
connected to Protective Earth when installed in the end
application and must satisfy the requirements of IEC 60950-1 for
Class I products.
BCM®1
R0_1
VLO
VHI
ZLO_EQ2
ZHI_EQ2
BCM®2
R0_2
Summary
The case is required to be connected to protective earth in the
final installation.
+
Load
DC
The construction of the VIA can be summarized by describing it as
a “Class II” component installed in a “Class I” subassembly.
ChiP Isolation
ZLO_EQn
BCM®n
R0_n
ZHI_EQn
High voltage side
Low voltage side
SELV
Figure 24 — BCM module array
Fuse Selection
In order to provide flexibility in configuring power systems, BCM in
a VIA package modules are not internally fused. Input line fusing
of BCM products is recommended at the system level to provide
thermal protection in case of catastrophic failure.
RI
The fuse shall be selected by closely matching system
requirements with the following characteristics:
Figure 25 — ChiP™ before final assembly in the VIA
ꢀnCurrent rating
(usually greater than maximum current of BCM module)
HV VIA Isolation Drawing
ꢀnMaximum voltage rating
(usually greater than the maximum possible input voltage)
ꢀnAmbient temperature
+HI
-HI
+LO
-LO
ChiP
ꢀnNominal melting I2t
High voltage side
Low voltage side
SELV
ꢀnRecommend fuse: see safety agency approvals (HI side)
VIA HI Side Circuit
VIA LO Side Circuit
Reverse Operation
RI
BCM modules are capable of reverse power operation. Once the
unit is started, energy will be transferred from the low voltage
side back to the high voltage side whenever the low side voltage
exceeds VHI • K. The module will continue operation in this fashion
as long as no faults occur.
FI
BI
PE
The BCM4414xG0F4440yzz has not been qualified for continuous
operation in a reverse power condition. However, fault protections
that help to protect the module in forward operation will also
protect the module in reverse operation.
Figure 26 — BCM in a VIA package after final assembly
Transient operation in reverse is expected in cases where there is
significant energy storage on the low voltage side and transient
voltages appear on the high voltage side.
BCM® in a VIA™ Package
Page 22 of 43
Rev 1.2
01/2018
VICOR [ VICOR CORPORATION ]
