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Not Recommended for New Designs - Replaced by BCM48Bx480y300A00
Application Note (continued)
Input reflected ripple
B048F480T30
F1
10 A
Fuse
measurement point
Notes:
Enable / Disable Switch
+In
+Out
+
Source inductance should be no more than 200 nH. If source inductance is
greater than 200 nH, additional bypass capacitance may be required.
Ro
C1
47 μF
electrolytic
SW1 D1
R2
2 k Ω
TM
RSV
PC
-In
-Out
BCM ?
+Out
K
-Out
R3
5 m Ω
C3
9.4 μF
Load
–
C3 should be placed close to the load.
R3 may be ESR of C3 or a separate damping resistor.
D1 power good indicator will dim when a module fault is detected.
Figure 20 — BCM ? module test circuit
BCM ? Bus Converter Level 1 DC Behavioral Model for 48 V to 48 V, 300 W
I OUT
R OUT
+
188.0 m Ω
+
V IN
–
I Q
73 mA
1
? Iout
+
–
V ? I
K
+
–
1
? Vin
V OUT
–
?
Figure 21 — This model characterizes the DC operation of the bus converter, including the converter transfer function and its losses. The model enables estimates
or simulations of output voltage as a function of input voltage and output load, as well as total converter power dissipation or heat generation.
BCM ? Bus Converter Level 2 Transient Behavioral Model for 48 V to 48 V, 300 W
14.8 nH
I OUT
R OUT
Lout
1.6 nH
+
V IN
C IN
RC IN
1.3 m Ω
4.0 μF
I Q
73 mA
1
? Iout
+
–
V?I
+
–
1
47.1 m Ω
? Vin
188.0 m Ω
C OUT
RC OUT
0.87 m Ω
6 μF
+
V OUT
K
–
–
?
Figure 22 — This model characterizes the AC operation of the bus converter including response to output load or input voltage transients or steady state
modulations. The model enables estimates or simulations of input and output voltages under transient conditions, including response to a stepped load with or
without external filtering elements.
BCM ? Bus Converter
Page 11 of 12
Rev 3.4
01/2014
vicorpower.com
800 927.9474
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