Specifications, continued
OUTPUT (Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Min
Typ
Max
Unit
Note
Rated DC current
0
17.0
Adc
Max pulse width 1ms, max duty cycle 10%,
baseline power 50%
Peak repetitive current
25.0
A
DC current limit
17.0
21.0
5
26.0
10
Adc
%
Current share accuracy
Efficiency
See Parallel Operation on page 12
10A load
95.5
95.0
96.2
95.7
1.6
%
%
See Fig.5
See Fig.5
Full load
Internal output inductance
Internal output capacitance
Load capacitance
Output overvoltage setpoint
Output ripple voltage
No external bypass
1µF bypass capacitor
Average short circuit current
Effective switching frequency
Line regulation
nH
µF
µF
Vdc
12
Effective value
1000
150
14.75
95
12
mV
mV
See Figs.7 and 9
See Fig.8
200
3.5
mA
2.8
4.2
0.255
25
MHz
Fixed, 1.75 MHz per phase
VOUT=K•VIN at no load
See Fig. 26
K
0.245
0.250
Load regulation
ROUT
mΩ
Transient response
230
40
mV
mV
ns
0-17.0A load step, see Fig.10
1.2-15A load step with 1µF bypass, see Fig. 11
See Figs.10 and 11
Voltage overshoot
Response time
Recovery time
200
1
µs
See Figs.10 and 11
Output overshoot
Input turn-on
0
0
mV
mV
No output filter; See Fig.3
No output filter; See Fig.2
PC enable
Output turn-on delay
From application of power
From release of PC pin
250
ms
ms
No output filter; See Fig.3
No output filter; See Fig.2
50
OUTPUT WAVEFORMS
Efficiency vs. Output Power
Power Dissipation
97
96
95
94
93
92
91
90
89
10
9
8
7
6
5
4
3
2
1
0
0
50
100
150
200
25
75
125
175
0
50
100
150
200
25
75
125
175
Output Power (W)
Output Power (W)
Figure 5— Efficiency vs. output power at 12 Vout
Figure 6—Power dissipation as a function of output power
Vicor Corporation
Tel: 800-735-6200
V•I Chip Bus Converter
B048K120T20
Rev. 2.2
Page 3 of 16
45
vicorpower.com
VICOR [ VICOR CORPORATION ]
