PR036A480T012FP Datasheet, PDF (9/13 Pages) Vicor Corporation – PRM™ Regulator

APPLICATION INFORMATION
Overview of Adaptive Loop Compensation
Adaptive Loop compensation, illustrated in Figure 15, contributes to the
bandwidth and speed advantage of Factorized Power. The PRM moni-
tors its output current and automatically adjusts its output voltage to
compensate for the voltage drop in the output resistance of the VTM.
R_OS sets the desired value of the VTM output voltage, Vout; R_CD is set to
a value that compensates for the output resistance of the VTM (which,
ideally, is located at the point of load). For selection of R_OS and R_CD,
refer to Table 1 below or Page 10.
The VI BRICK’s bi-directional VC port :
1. Provides a wake up signal from the PRM to the VTM that
synchronizes the rise of the VTM output voltage to that of the PRM.
2. Provides feedback from the VTM to the PRM to enable the PRM to
compensate for the voltage drop in VTM output resistance, R_O.
Vin
VC
VH
PC
SC
TM
SG
IL
NC
OS
NC
ROS
PR
CD
RCD
+IN ^PRM +OUT
-IN
-OUT
Factorized
Bus (Vf)
Vf =
VL
K
+
(Io•Ro)
K
Vo = VL ^± 1.0%
+IN
+OUT
L
-OUT
TM
VC VTM
O
PC
+OUT
A
-IN
-OUT
D
Figure 15 — With Adaptive Loop control, the output of the VTM is regulated over the load current range with only a single interconnect between the PRM and
VTM and without the need for isolation in the feedback path.
Desired Load Voltage (Vdc)
1.0
1.2
1.5
1.8
2.0
3.0
3.3
5.0
8.0
9.6
10
12
15
24
28
36
48
VI BRICK VTM P/N⁽¹⁾
VT048A015T100FP
VT048A015T100FP
VT048A015T100FP
VT048A020T080FP
VT048A020T080FP
VT048A030T070FP
VT048A040T050FP
VT048A060T040FP
VT048A080T030FP
VT048A096T025FP
VT048A120T025FP
VT048A120T025FP
VT048A160T015FP
VT048A240T012FP
VT048A320T009FP
VT048A480T006FP
VT048A480T006FP
Max VTM Output Current (A)⁽²⁾
100
100
100
80
80
70
50
40
30
25
25
25
15
12.5
9.4
6.3
6.3
Note:
(1) See Table 2 on page 10 for nominal Vout range and K factors.
(2) See “PRM output power vs. VTM output power” on Page 11
(3) 1% precision resistors recommended
Table 1 — Configure the VI BRICK PRM/VTM for the desired output voltage.
R_OS (kΩ)⁽³⁾
3.57
2.94
2.37
2.61
2.37
2.37
2.89
2.87
2.37
2.37
2.86
2.37
2.49
2.37
2.74
3.16
2.37
R_CD (Ω)⁽³⁾
26.1
32.4
39.2
35.7
39.2
39.2
32.6
33.2
32.9
32.9
32.9
39.2
37.4
39.2
35.7
30.1
39.2
Pre-Regulator Module
PR036A480T012FP
vicorpower.com
Rev. 1.1
Page 9 of 13