B048F096T24-EB Datasheet, PDF (11/12 Pages) Vicor Corporation – Bus Converter

Application Note (continued)
F1
7A
Fuse
C1
47 µF
electrolytic
Input reflected ripple
measurement point
Enable / Disable Switch
R2
2 kΩ
SW1 ^D1
+Out
+In
-Out
TM
RSV
BCM™
PC
+Out
K
Ro -In
-Out
Figure 20 — BCM™ module test circuit
+
R3
10 mΩ
Load
C3
10 µF
–
Notes:
Source inductance should be no more than 200 nH. If source inductance is
greater than 200 nH, additional bypass capacitance may be required.
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.
BCM™ Bus Converter Level 1 DC Behavioral Model for 48 V to 9.6 V, 240 W
I_OUT
R_OUT
+
8.9 mΩ
+
1/5 • Iout
V•I
1/5 • Vin
++
V_IN
I_Q
64 mA
––
K
–
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 9.6 V, 240 W
L_IN = 5 nH
I_OUT
5.5 nH
R_OUT
Lout 1.6 nH
+
8.9 mΩ
+
RC_IN
1.3 mΩ
1/5 • Iout
V•I
25 mΩ
1/5 • Vin
RC_OUT
0.2 mΩ
C_IN
4.0 µF
V_IN
I_Q
64 mA
++
––
K
C_OUT
55 µF
V_OUT
–
–
©
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.
vicorpower.com 800-735-6200
BCM™ Bus Converter
B048F096T24
Rev. 4.9
Page 11 of 12