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Not Recommended for New Designs
Electrical Specifications
Input Specs (Conditions are at 45 Vin, 48 Vf, full load, and 25°C ambient unless otherwise specified)
V?I Chip Regulator
Parameter
Input voltage range
Min
38
Typ
45
Max
55
Unit
Vdc
Note
Input dV/dt
1
V/μs
Input undervoltage turn-on
35.7
37.3
Vdc
Input undervoltage turn-off
Input overvoltage turn-on
32.1
55.5
33.6
56.6
Vdc
Vdc
Input overvoltage turn-off
57.7
59.4
Vdc
Input quiescent current
Input current
Input reflected ripple current
No load power dissipation
Internal input capacitance
Recommended external input capacitance
0.5
7.3
760
3.0
5
100
1
6.0
mA
Adc
mA p-p
W
μF
μF
PC low
See Figures 4 & 5
Ceramic
See Figure 5 for input filter circuit.
Source impedance dependent
Input Waveforms
Figure 2 — Vf and PC response from power up
Figure 3 — Vf turn-on waveform with inrush current – PC enabled
VC
VH
+IN
10 A
Reflected
Ripple
Measurement
0.01 μ F
10 k Ω
PC
TM
IL
NC
PR
PRM-AL
+In +Out
SC
SG
OS
NC
CD
2.37 k Ω
+ OUT
100 μ F
Al-Electrolytic
–IN
–In
–Out
– OUT
Figure 4 — Input reflected ripple current
Figure 5 — Input filter capacitor recommendation
vicorpower.com
800-735-6200
V?I Chip Regulator
P045F048T32AL
Rev. 2.5
Page 3 of 14
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