V048F040T050 Datasheet, PDF (9/13 Pages) Vicor Corporation – VI Chip - VTM Voltage Transformation Module

Application Note (continued)
PRELIMINARY
Figure 15—Thermal resistance
VTM with 0.25'' heat sink
10
9
8
7
6
5
4
3
0
100
200
300
400
500
600
Airflow (LFM)
Figure 16—Junction-to-ambient thermal resistance of VTM with 0.25"
Heat Sink.
V•I Chip VTM Level 1 DC Behavioral Model for 48 V to 4 V, 50 A
IOUT
ROUT
+
3.3 mΩ
1/12• Iout
V•I
++
1/12• Vin
VIN
IQ
85 mA
––
K
–
+
VOUT
–
©
Figure 17—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 4 V, 50 A
L IN = 5 nH
IOUT
8.5 nH
ROUT
LOUT = 1.1 nH
+
R_{1R.C3CINmINΩ}
3.3 mΩ
+
V•I
40 mΩ
RR_COOUUTT
0.7 mΩ
CIN
1.9 µF
1/12• Iout
+
+ ^{1/12• Vin}
COUT
255 µF
VIN
IQ
85 mA
––
VOUT
K
–
–
©
Figure 18—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
V048F040T050
Rev. 1.1
Page 9 of 13