V048K120T025 Datasheet, PDF (12/15 Pages) Vicor Corporation – V, I ChipTM-VTM Voltage Transformation Module

Application Note (continued)
In Figures 21 – 24;
K = VTM Transformation Ratio
RO = VTM Output Resistance
FPA Adaptive Loop
PRELIMINARY
V•I Chip Voltage Transformation Module
Vf = PRM Output (Factorized Bus Voltage)
VO = VTM Output
VL = Desired Load Voltage
Vin
VC
VH
PC
SC
TM
SG
IL
OS
NC
NC
PR
CD
PRM-AL
+In
+Out
ROS
RCD
–In
–Out
Factorized
Bus (Vf)
Vf =
VL
K
+
(Io•Ro)
K
Vo = VL ^± 1.0%
+Out
+In
L
-Out
TM
VC
VTM
O
PC
+Out
A
K
D
Ro -In
-Out
Figure 21 — The PRM controls the factorized bus voltage, Vf, in proportion to output current to compensate for the output resistance, Ro, of the VTM. The VTM
output voltage is typically within 1% of the desired load voltage (VL) over all line and load conditions.
FPA Non-isolated Remote Loop
Vin
VC
VH
PC
SC
TM
SG
IL
OS
NC
NC
PR _PRM-AL CD
+In
+Out
–In
–Out
Remote
Loop
Control
Factorized
Power Bus
V_f = f (Vs)
+Out
+In
-Out
TM
VC
VTM
PC
+Out
K
Ro ^-In
-Out
Vo = VL ^± 0.4%
+S _L
O
A
–S D
Figure 22 — An external error amplifier or Point-of-Load IC (POLIC) senses the load voltage and controls the PRM output – the Factorized Bus – as a function of
output current, compensating for the output resistance of the VTM and for distribution resistance.
FPA Isolated Remote Loop
Vin
VC
VS
PC
FB
TM
FG
IL
NC
NC
NC
PR
NC
PRM-IF
+In
+Out
–In
–Out
Factorized
Power Bus
V_f = f (Vs)
Remote
Loop
Control
+Out
+In
-Out
TM
VC
VTM
PC
+Out
K
Ro ^-In
-Out
Vo = VL ^± 0.4%
+S _L
O
A
–S D
Figure 23—An external error amplifier or Point-of-Load IC (POLIC) senses the load voltage and controls the PRM output – the factorized bus – as a function of
output current, compensating for the output resistance of the VTM and for distribution resistance. The Factorized Bus voltage (Vf) increases in proportion to load
current. The remote feedback loop is isolated within the PRM to support galvanic isolation and hipot compliance at the system level.
vicorpower.com 800-735-6200
V•I Chip Voltage Transformation Module
V048K120T025
Rev. 1.0
Page 12 of 16