Application Note (continued)
Closed Loop Application
PRELIMINARY
To compensate for the effect of the VTM鈥檚 output resistance on
the load voltage as a function of load current, a feedback loop
can be implemented as shown in Fig.30.
VTMs can also be used in a Factorized Power Architecture
system with VID control of the output voltage as a faster, more
efficient alternative to multiphase VRMs as shown in Fig.31.
Off-line DC-DC converters, telecom input DC-DC converters
and switching regulators may be adapted, through a suitable
interface, to provide the PRM function.
High efficiency, high density PRMs in V鈥 Chip packages are in
development.
Please consult with Vicor application engineering for specific
application information.
Email:apps@vicr.com; phone: 1-800-927-9474
FPA Application Example
Unregulated
Input Bus
PRM
Factorized
Bus
V
f
VTM
V
f
鈥?/div>
K
Load
Figure 30鈥擝asic
Factorized Power Architecture with Pre-Regulation Module (PRM) and VTM
FPA Application Example
DC
Distribution
Bus
PRM
V
f
= 32-58 Vdc
VTM
32:1
1.0-1.8
Vdc
碌P
VID Control
POL IC
Analog
Control
Figure 31鈥擯RM
and VTM, Closed loop with VID Controller
45
Vicor Corporation Tel: 800-735-6200 vicorpower.com
V鈥 Chip Voltage Transformation Module
Rev. 1.6
Page 15 of 20
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