V048K120T025 Datasheet, PDF (11/15 Pages) Vicor Corporation – V, I ChipTM-VTM Voltage Transformation Module

Application Note (continued)
PRELIMINARY
Figure 17—Thermal resistance
VTM with optional 0.25'' Pin Fins
10
9
8
7
6
5
4
3
0
100
200
300
400
500
600
Airflow (LFM)
Figure 18—Junction-to-ambient thermal resistance of VTM with 0.25"
Pin Fins. (Pin Fins are available as a separate item.)
V•I Chip VTM Level 1 DC Behavioral Model for 48 V to 12 V, 25 A
IOUT
ROUT
+
11.7 mΩ
+
1/4 • Iout
V•I
1/4 • Vin
++
VIN
IQ
99 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 48 V to 12 V, 25 A
L_LIN_IN=₌2₂0₀n_nH_H
IOUT
8.5 nH
ROUT
LOUT = 1.1 nH
+
R_{2R.C5CImNINΩ}
11.7 mΩ
+
V•I
40 mΩ
RR_COUT
1 µΩ
CIN
4 µF
1/4 • Iout
1/4 • Vin
++
COUT
55 µF
VIN
IQ
99 mA
––
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.
vicorpower.com 800-735-6200
V•I Chip Voltage Transformation Module
V048K120T025
Rev. 1.0
Page 11 of 16