V048F480T006 Datasheet, PDF (10/11 Pages) Vicor Corporation – VTM Current Multiplier

Application Note (continued)
VTM™ Current Multiplier Level 1 DC Behavioral Model for 48 V to 48 V, 6.3 A
I_OUT
R_OUT
+
188.0 mΩ
+
1 • I_OUT
V•I
1 • V_IN
++
V_IN
I_Q
73 mA
––
K
–
V_OUT
–
©
Figure 16 — 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™ Current Multiplier Level 2 Transient Behavioral Model for 48 V to 48 V, 6.3 A
L_IN = 5 nH
I_OUT
14.8 nH
R_OUT
L_OUT = 1.6 nH
+
R_{1R.CC3INmINΩ}
188.0 mΩ
+
V•I
47.1 mΩ
RR_0C.C8OO₇U_UmT_TΩ
1 • I_OUT
1 • V_IN
C_IN
4.0 µF
V_IN
I_Q
++
C_OUT
6 µF
V_OUT
73 mA
––
K
–
–
©
Figure 17 — 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.
In figures below;
K = VTM™ current multiplier transformation ratio
R_O = VTM output resistance
FPA™ Adaptive Loop
V_F = PRM output (Factorized Bus Voltage)
V_O = VTM output
V_L = Desired load voltage
V_IN
VC
VH
PC
SC
0.01 mF T M
SG
IL
OS
NC
P R PRM™ -AL
NC
CD
ROS
10 kΩ
Module
RCD
+In
+Out
–In
–Out
Factorized
Bus (V_F)
0.4 µH
10 Ω
+Out
+In
L
+Out
TM _VTM™
O
VC
PC
Module
– Out
A
K
D
Ro – In
– Out
Figure 18 — The PRM™ regulator controls the factorized bus voltage, V_F , in proportion to output current to compensate for the output resistance, Ro, of the
VTM™ current multipler. The VTM module output voltage is typically within 1% of the desired load voltage (V_L) over all line and load conditions.
vicorpower.com 800-735-6200
VTM™ Current Multiplier
V048F480T006
Rev. 3.1
Page 10 of 11