MBC250 Series
Medical Power Supplies
12 VDC, 24 VDC, 48 VDC
The MBC250 series of AC-DC power supplies are
designed to suit medical and many other
applications. This family meets the international
information technology and medical safety
standards. The high efficiency design has minimal
power loss in end equipment, resulting in higher
reliability, ease of thermal management.
Features
•
•
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•
•
•
•
•
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•
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Designed for Medical equipment (meet MOOP
and MOPP)
High efficiency up to 90% at 230 VAC full load
Universal AC input voltage range: 90-264 VAC
Active power factor correction
Over temperature, output over voltage, over
current and short circuit protection
Input over voltage, under voltage protection
Low conducted and radiated EMI (EN 55011
class A 6db margin)
Safety approval to UL 60601-1 3
rd
,CSA60601-
1 3
rd
and IEC60950-1 3
rd
High power density design: 11.2 W/in
3
Compact size: 3.0 (W) x 1.5 (H) x 5.0 (L) inch
ROHS compliant
Applications
Medical
Telecom
Datacom
Industrial equipment
North America
+1-866.513.2839
Asia-
Asia-Pacific
+86.755.29885888
Europe, Middle East
+353 61 225 977
Bel Power Solutions
152 North 3rd Street, Suite 805
San Jose, CA 95112 USA
© 2015 Bel Power Solutions, inc.
tech.support@psbel.com
belpowersolutions.com
BCD.G0901_AB
MBC250-10XXG
1 Ordering Information
MODELS
MBC250-1012G
MBC250-1024G
MBC250-1048G
MBC250-1024S302G
1)
1)
MBC250-1024S302G
OUTPUT
VOLTAGE (VDC)
12 V
24 V
48 V
26.7 V
MAX LOAD
CONVECTION
10 A
5A
2A
4.5 A
MAX LOAD
200 LFM
19 A
10.5 A
5.25 A
9.43 A
MINIMUM
LOAD
0A
0A
0A
0A
RIPPLE & NOISE
1%
1%
1%
1%
TOTAL
REGULATION
± 3%
± 3%
± 3%
± 3%
is an extended model for MBC250-1024G
.
2 Overview
The MBC250-10XXG is a high efficiency and high power density AC to DC power supply. It uses single phase transition
mode PFC converter and well proven two-FET forward converter with output diode rectifiers, providing increased system
reliability and high efficiency. With around 200 LFM (1 m/s) system air cooling, MBC250-1012G can delivery up to 228W
continuous output power and 252W for MBC250-1024G and MBC250-1048G.
Figure 1: MBC250-10XXG block diagram
866.513.2839
tech.support@psbel.com
belpowersolutions.com
© 2015 Bel Power Solutions, inc.
BCD.G0901_AB
MBC250-10XXG
3 Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely affect long-term
reliability, and cause permanent damage to the supply.
PARAMETER
DESCRIPTION / CONDITION
Continuous
MIN
NOM
MAX
264
UNIT
VAC
V
i maxc
Max continuous input
4 Environmental and Mechanical
PARAMETER
DESCRIPTION / CONDITION
MIN
-10
+50
-40
76.2
38.1
127.0
0.5
NOM
MAX
+50
+70
+85
UNIT
°C
°C
°C
mm
mm
mm
kg
T
A
T
Aext
T
S
Ambient temperature
Extended temp range
Storage temperature
V
i min
to
V
i max
,
I
1 nom
,
Derated output
Non-operational
Width
Dimensions
Height
Depth
M
Weight
5 Input Specifications
General Condition:
T
A
= -10… 50 °C unless otherwise noted.
Active fan air cooling required: 200 LFM (1 m/s).
PARAMETER
DESCRIPTION / CONDITION
MIN
100
Normal operating (
V
i min
to
V
i max
)
90
NOM
MAX
240
264
3.5
30
60
63
UNIT
VAC
VAC
A
rms
A
p
Hz
W/VA
89
85
VAC
VAC
%
18
300
mS
uA
V
i nom
V
i
I
i max
I
i p
F
i
PF
Nominal input voltage
Input voltage ranges
Max input current
Inrush current limitation
Input frequency
Power factor
Turn-on input voltage
1)
Turn-off input voltage
1)
Efficiency
Hold-up Time
Earth leakage current
V
i nom
=115 VAC,
T
= 25°C (see Figure 2)
V
i nom
=230 VAC,
T
= 25°C (see Figure 3)
47
50/60
V
i nom=
=264 VAC, > 0.5
I
o nom
Ramping up
Ramping down
0.9
82
78
88
2)
90
12
V
i on
V
i off
η
V
i nom
=230 VAC, 0.5·
I
o nom
,
V
o nom
,
T
A
= 25 °C
V
i nom
=230 VAC, 1.0·
I
o nom
,
V
o nom
,
T
A
= 25 °C
After last AC zero point,
V
o
within regulation,
V
i
=
115 VAC,
P
o nom
264 VAC at 60 Hz
T
hold
Li
1)
The
2)
power supply is provided with a minimum hysteresis of 2 V during turn-on and turn-off within the ranges.
For MBC250-1012G/1048G half load minimum efficiency is 87.5%.
5.1 Input Fuse
Double fusing with 5 A slow-blow type (5 × 20 mm), in series with Live and neutral line inside of the power supply protects
against severe defects. The fuses and a VDR form together with the input filter an effective protection against high input
transients.
866.513.2839
tech.support@psbel.com
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© 2015 Bel Power Solutions, inc.
BCD.G0901_AB
MBC250-10XXG
5.2 Inrush Current
The AC-DC power supply exhibits an X-capacitance of only 2.0
μF,
resulting in a low and short peak current, when the supply
is connected to the mains. The internal bulk capacitor will be charged through a power resistor which will limit the inrush
current (see Figure 2 and 3).
Figure 2: Inrush current, V
in
= 115 VAC, Phase=90°, CH1: V
in
(200 V/div), CH2: I
in
(10 A/div)
Test data: the inrush current is 13 A at 115 VAC input
Figure 3: Inrush current, V
in
= 230 VAC, Phase=90°, CH1: V
in
(200 V/div), CH2: I
in
(10 A/div)
Test data: the inrush current is 30 A at 230 VAC input
5.3 Input Under-voltage
If the sinusoidal input voltage stays below the input under voltage lockout threshold
V
i on
, the supply will be inhibited. Once
the input voltage returns within the normal operating range, the supply will return to normal operation again.
5.4 Power Factor Correction
Power factor correction (PFC) is achieved by controlling the input current waveform synchronously with the input voltage. A
specified PFC controller is implemented in single phase transition mode topology giving outstanding PFC results over a wide
input voltage and load ranges. The input current will follow the shape of the input voltage.
866.513.2839
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belpowersolutions.com
© 2015 Bel Power Solutions, inc.
BCD.G0901_AB
MBC250-10XXG
5.5 Efficiency
The high efficiency (see Figure 4, 5 and 6) is achieved by using state-of-the-art silicon power devices in conjunction with
transition mode PFC topology minimizing switching losses. Synchronous rectifiers on the output reduce the losses in the
high current output path for MBC250-1012G.
Schottky diode and ultra-fast diode are used as rectifiers for MBC250-1024G and MBC250-1048G separately due to the high
output voltage level
.
92
89
86
83
80
77
74
71
68
65
0
50
100
Po(W)
150
200
250
92.00
89.00
86.00
83.00
80.00
77.00
74.00
71.00
68.00
65.00
0
50
100
150
Po(W)
200
250
300
Efficiency (%)
Figure 4: Efficiency vs. Output Power at 230 VAC, MBC250-1012G
Figure 5: Efficiency vs. Output Power at 230 VAC, MBC250-1024G
92.00
89.00
86.00
83.00
80.00
77.00
74.00
71.00
68.00
65.00
0
50
100
150
Po(W)
200
250
300
Figure 6: Efficiency vs. Output Power at 230 VAC, MBC250-1048G
Efficiency(%)
Efficiency(%)
866.513.2839
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© 2015 Bel Power Solutions, inc.
BCD.G0901_AB
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