V048K020T080 Datasheet, PDF (11/15 Pages) Vicor Corporation – VI Chip - VTM Voltage Transformation Module

Application Note (continued)
PRELIMINARY
Figure 17—Thermal resistance
10
9
8
7
6
5
4
3
0
VTM with 0.25'' heat sink
100
200
300
400
500
600
Airflow (LFM)
Figure 18—Junction-to-ambient thermal resistance of VTM
with 0.25" Heat Sink.
V•I Chip VTM LEVEL 1 DC BEHAVIORAL MODEL for 48V to 2V, 80A
IOUT
ROUT
+
1.3 mΩ
+
1/24 • Iout
V•I
++
1/24 • Vin
VIN
IQ
52 mA
––
K
-
VOUT
–
©
Figure 19—This model characterizes the DC operation of the V•I Chip VTM, 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 VTM LEVEL 2 TRANSIENT BEHAVIORAL MODEL for 48V to 2V, 80A
LIN = 20 nH
IOUT
0.12 nH
ROUT
LOUT = 0.8 nH
+
1.3 mΩ
+
RC_IN
1.3 mΩ
1/24 • Iout
V•I
0.6 mΩ
1/24 • Vin
RC_OUT
65 µΩ
CIN
4 µF
VIN
IQ
52 mA
++
––
COUT
306 µF
VOUT
K
–
–
©
Figure 20—This model characterizes the AC operation of the V•I Chip VTM 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: [phone]
vicorpower.com
V•I Chip Voltage Transformation Module V048K020T080 Rev. 1.2 Page 11 of 15