PR045A480T032TP datasheet(9/13 Pages) VICOR

9 / 13 page

Pre-Regulator Module

PR045A480T032FP

vicorpower.com

Rev. 1.1

Page 9 of 13

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.

ROS sets the desired value of the VTM output voltage, Vout; RCD 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 ROS and RCD,

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, RO.

Factorized

Bus (Vf)

Vo = VL ± 1.0%

(Io•Ro)

Vf = V

L +

Vin

ROS

RCD

PRM

+IN

+OUT

-OUT

-IN

VTM

+IN

+OUT

-OUT

+OUT

-OUT

-IN

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)

VI BRICK VTM P/N(1)

Max VTM Output Current (A)(2)

ROS (k

Ω)(3)

RCD (

Ω)(3)

1.0

VT048A015T100FP

100

3.57

26.1

1.2

VT048A015T100FP

100

2.94

32.4

1.5

VT048A015T100FP

100

2.37

39.2

1.8

VT048A020T080FP

2.61

35.7

2.0

VT048A020T080FP

2.37

39.2

3.0

VT048A030T070FP

2.37

39.2

3.3

VT048A040T050FP

2.89

32.6

5.0

VT048A060T040FP

2.87

33.2

8.0

VT048A080T030FP

2.37

32.9

9.6

VT048A096T025FP

2.37

32.9

VT048A120T025FP

2.86

32.9

VT048A120T025FP

2.37

39.2

VT048A160T015FP

2.49

37.4

VT048A240T012FP

12.5

2.37

39.2

VT048A320T009FP

9.4

2.74

35.7

VT048A480T006FP

6.3

3.16

30.1

VT048A480T006FP

6.3

2.37

39.2

Table 1 — Configure the VI BRICK PRM/VTM for the desired output voltage.

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

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