SPECIFICATIONS (CONT.)
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Output Specifications
Parameter
Min
38.0
36.7
0
Typ
Max
55.0
53.8
297
8.2
Unit
Vdc
Vdc
W
Note
No load
Full load
38.0 - 55 VIN
Output voltage
Output power
Rated DC current
0
Adc
POUT ≤ 300 W
Max pulse width 1ms, max duty cycle 10%,
baseline power 50%
Peak repetitive power
450
10
W
%
Current share accuracy
Efficiency
5
See Parallel Operation on Page 8
Half load
96.0
96.0
96.7
96.4
1.6
6
%
%
See Figure 5
See Figure 5
Full load
Internal output inductance
Internal output capacitance
Load capacitance
Output overvoltage setpoint
Output ripple voltage
No external bypass
9.4 µF bypass capacitor
Short circuit protection set point
Average short circuit current
Effective switching frequency
Line regulation
nH
µF
Effective value
100
320
µF
55.0
Vdc
180
20
mVp-p
mVp-p
Adc
See Figures 7 and 9
See Figure 8
6.4
3.2
Module will shut down
0.095
3.3
A
3.5
MHz
Fixed, 1.7 MHz per phase
VOUT = K•VIN at no load
K
0.9900
1
1.0100
210.0
Load regulation
ROUT
188.0
mΩ
Transient response
Voltage overshoot
Response time
1.2
200
1
V
100% load step; See Figures 10 and 11
See Figures 10 and 11
ns
µs
Recovery time
See Figures 10 and 11
Output overshoot
Input turn-on
0
0
mV
mV
No output filter; See Figure 3
No output filter; See Figure 2
PC enable
Output turn-on delay
From application of power
From release of PC pin
295
67
ms
ms
No output filter; See Figure 3
No output filter
OUTPUT WAVEFORMS
Power Dissipation
Efficiency vs. Output Power
12
10
8
98
96
94
92
90
88
86
6
4
2
0
30
60
90 120 150 180 210 240 270 300
0
30
60
90 120 150 180 210 240 270 300
Output Power (W)
Output Power (W)
Figure 5 — Efficiency vs. output power
Bus Converter Module BC048A480T030FP
Figure 6 — Power dissipation as a function of output power
vicorpower.com Rev. 1.0
Page 4 of 11
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