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V•I Chip Pre-Regulator Module

P048K048T24AL

Rev. 1.4

Page 2 of 15

PRELIMINARY

Overview of Adaptive Loop Compensation

Adaptive Loop compensation, illustrated in Figure 1, contributes to

the bandwidth and speed advantage of Factorized Power. The PRM

monitors its output current and automatically adjusts its output

voltage to compensate for the voltage drop in the output

resistance of the VTM (which, ideally, is located at the point of

The V•I Chip’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

-In

PC

VC

TM

+In

-Out

+Out

VTM

+Out

-Out

K

Ro

+Out

–Out

+In

–In

VC

PC

TM

IL

VH

PR

NC

SG

SC

PRM-AL

OS

NC

CD

L

O

A

D

Factorized

(Io•Ro)

K

+

K

Vin

Output Power

Designator

P

048

K

048

T

24

AL

Pre-Regulator

Module

Input Voltage

Designator

Product Grade Temperatures (°C)

Grade

Storage

Operating

T

-40 to150 -40 to125

M

-65 to150 -55 to125

Configuration Options

F = Onboard (Fig.22)

K = Inboard (Fig.21)

Nominal

Factorized Bus

Voltage

AL = Adaptive Loop

Desired Load Voltage (Vdc)

1.0

V048K015T100

100

3.57

26.1

1.2

V048K015T100

100

2.94

32.4

1.5

V048K015T090

90

2.37

39.2

1.8

V048K020T080

80

2.61

35.7

2.0

V048K020T080

80

2.37

39.2

3.3

V040K033T060

60

2.15

43.2

5.0

V048K060T040

40

2.87

33.2

10

V048K120T025

25

2.26

41.2

12

V048K120T025

25

2.37

39.2

15

V048K160T019

18.8

2.49

37.4

24

V048K240T012

12.5

2.37

39.2

28

V048K320T009

9.4

2.74

35.7

36

V048K480T006

6.3

3.16

30.1

48

V048K480T006

6.3

2.37

39.2

Table 1 — Configure your Chip Set using the PRM-AL

Note:

(1) Verify the configuration option and product grade temperature before ordering as shown above.

(2) See “PRM output power vs. VTM output power” on Page 10

(3) 1% precision resistors recommended

Figure 1 — 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.

General Specifications

V•I Chip Pre-Regulator Module

Part Numbering