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V•I Chip Pre-Regulator Module

P048F048T12AL

Rev. 1.0

Page 3 of 14

PRELIMINARY

Parameter

Min

Typ

Max

Unit

Note

Input voltage range

36

48

75

Vdc

Input dV/dt

1

V/µs

Input undervoltage turn-on

33.8

35.3

Vdc

Input undervoltage turn-off

30.5

31.8

Vdc

Input overvoltage turn-on

75.8

77.3

Vdc

Input overvoltage turn-off

78.8

81.0

Vdc

Input quiescent current

0.5

1

mA

PC low

Input current

2.6

Adc

Input reflected ripple current

280

mA p-p

See Figures 4 & 5

No load power dissipation

2

4

W

Internal input capacitance

5

µF

Ceramic

Recommended external input capacitance

100

µF

See Figure 5 for input filter circuit.

Source impedance dependent

Figure 3 — Vf turn-on waveform with inrush current – PC enabled at

full load, 48 Vin

Figure 2 — Vf and PC response from power up

Figure 4 — Input reflected ripple current at full load and 48 Vin

Input Waveforms

+IN

–IN

+Out

–Out

+In

–In

VC

PC

TM

IL

VH

PR

NC

SG

SC

PRM-AL

OS

NC

CD

100

μF

Al-Electrolytic

Reflected

Ripple

Measurement

2.37 k

Ω

+ OUT

– OUT

10 A

Figure 5 — Input filter capacitor recommendation

Electrical Specifications

V•I Chip Pre-Regulator Module