V048F040T050 Datasheet, PDF (10/13 Pages) Vicor Corporation – VI Chip - VTM Voltage Transformation Module

Application Note (continued)
In figures below;
K = VTM Transformation Ratio
RO = VTM Output Resistance
PRELIMINARY
V•I Chip Voltage Transformation Module
Vf = PRM Output (Factorized Bus Voltage)
VO = VTM Output
VL = Desired Load Voltage
FPA Adaptive Loop
Vin
VC
VH
PC
SC
TM
SG
IL
OS
NC
NC
PR _PRM-AL CD
+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 19 — 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
CD
PRM-AL
+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 20 — 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.
vicorpower.com 800-735-6200
V•I Chip Voltage Transformation Module
V048F040T050
Rev. 1.1
Page 10 of 13