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MC270A330M024FP bảng dữ liệu(PDF) 11 Page - Vicor Corporation

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PRELIMINARY DATASHEET
Bus Converter Module
MC270A330M024FP
vicorpower.com
Rev. 1.0
Page 11 of 17
Power, Voltage, Efficiency Relationships
Because of the high frequency, fully resonant SAC topology, power
dissipation and overall conversion efficiency of BCM converters can be
estimated as shown below.
Key relationships to be considered are the following:
1. Transfer Function
a. No load condition
VOUT = VIN K
Eq. 1
Where K (transformer turns ratio) is constant
for each part number
b. Loaded condition
VOUT = Vin K – IOUT ROUT
Eq. 2
2. Dissipated Power
The two main terms of power losses in the
BCM module are:
- No load power dissipation (PNL) defined as the power
used to power up the module with an enabled power
train at no load.
- Resistive loss (ROUT) refers to the power loss across
the BCM modeled as pure resistive impedance.
PDISSIPATED ~ PNL + PR
OUT
Eq. 3
~
Therefore, with reference to the diagram shown in Figure 16
POUT = PIN –PDISSIPATED = PIN –PNL –PR
OUT
Eq. 4
Notice that ROUT is temperature and input voltage dependent and PNL is
temperature dependent (See Figure 16).
INPUT
POWER
OUTPUT
POWER
PNL
PR
OUT
Figure 19 — Power transfer diagram
The above relations can be combined to calculate the overall module efficiency:
η =
POUT
=
PIN –PNL –PR
OUT
=
PIN
PIN
VIN IIN –PNL –(IOUT)
2 ROUT
=1 –
(PNL+ (IOUT)2ROUT)
VIN IIN
VIN IIN
Eq. 5
EFFICIENCY / DISSIPATION


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