PRELIMINARY
Application Note (continued)
V•I Chip BUS CONVERTER LEVEL 1 DC BEHAVIORAL MODEL for 48V to 12V, 150W
ROUT
32 mΩ
IOUT
+
+
•
V I
1
1
/
/
4 • Iout
4 • Vin
+
–
+
–
VOUT
VIN
Q
I
52 mA
K
-
–
©
Figure 28—This model characterizes the DC operation of the V•I Chip 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.
V•I Chip BUS CONVERTER LEVEL 2 TRANSIENT BEHAVIORAL MODEL for 48V to 12V, 150W
8.5 nH
ROUT
IOUT
= 1.6 nH
LOUT
IN
L
= 20 nH
+
32 mΩ
+
R
COUT
R
40 mΩ
4• Vin
/
CIN
•
V I
0.3 mΩ
1.8 mΩ
1/4 • Iout
1
+
–
+
–
4 µF
CIN
COUT
12 µF
VOUT
VIN
IQ
52 mA
K
–
–
©
Figure 29—This model characterizes the AC operation of the V•I Chip 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.
Vicor Corporation
Tel: 800-735-6200
V•I Chip Bus Converter
B048K120T15
Rev. 1.2
Page 13 of 16
45 vicorpower.com
VICOR [ VICOR CORPORATION ]
