EMH-54/3-Q48N-C Series
www.murata-ps.com
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
ORDERING GUIDE SUMMARY
Model
Vout Range
Iout Range
Vin Range
Ripple/Noise
Efficiency
54V
0.2-3A
18-72V
250mVp-p
91.5%
EMH-54/3-Q48
INPUT CHARACTERISTICS
Parameter
Typical units
Typ. @ 25°C, full load
Notes
Voltage Range
18-72 Volts
48V nominal
Input Current, full power
3.67 Amps
VIN = 48V
Turn On/start-up threshold
17.5 Volts
Undervoltage Shutdown
17 Volts
No load Input Current
40mA
VIN = 48V
OUTPUT CHARACTERISTICS
Parameter
Typ. @ 25°C, full load
Notes
Voltage
54 Volts
±2%
Current
0.2 to 3 Amps
0.2A min load required
Power Output
162 Watts
Ripple & Noise
250mVp-p
Line and Load Regulation
FEATURES
Industry-Standard “Half-Brick” footprint
162W output power @ 24-72Vin
4 Amps
Overtemperature Protection
+135°C
Efficiency (minimum)
89.5%
Efficiency (typical)
91.5%
Monotonic startup into pre-bias output conditions
Over-current, Output & Over-temperature protection
Low output ripple and noise
Output short-circuit protection (hiccup technique)
With hiccup auto-restart
GENERAL SPECIFICATIONS
Dynamic Load Response
Operational Temperature Range –40°C to +85°C
with baseplate
2250V I/O isolation
±0.125%/±0.2%
Overcurrent Protection
Up to 91.5% Efficiency at 54V output (typical)
On/Off Control (Negative logic)
Strong thermal derating characteristics
20MHz bandwidth
Parameter
Typ. @ 25°C, full load
Notes
300μsec
50-75-50% step to ±1 of final value
Operating Temperature Range
–40 to +85°C
With baseplate, see derating curve
Absolute Operating Temperature
Range
–40 to +105°C
Measured at Thermistor, see derating
UL 60950-1, 2nd edition
Safety Features
CSA-C22.2 No.60950-1 and
IEC/EN60950-1
PHYSICAL SPECIFICATIONS
Parameter
Inches
Millimeters
Open frame (no baseplate)
2.4 x 2.3 x 0.43
61 x 58.4 x 10.92
With baseplate
2.4 X 2.3 X 0.5
61.0 x 58.4 x 12.7
PRODUCT OVERVIEW
The EMH-54/3-Q48N-C module offers 54V output at 3
amps in a Half Brick footprint DC/DC power converter.
These compact modules measure 2.4˝ x 2.3˝ x 0.5˝ (61
x 58.4 x 12.7 mm) with baseplate and offer the industrystandard Half-Brick footprint. The product is designed to
fully comply with RoHS-6 directive.
The modules offer wide range input voltage of
18-72V. The EMH topology offers high efficiency up
to 91.5%, good regulation, low ripple/noise, and a
fast dynamic load response. The module supplies up
to 162 Watts of power and isolation rated at 2250V
for basic insulation. EMH models are designed for
demanding telecom, POE (power over Ethernet), datacom, and networking applications. EMHs feature input
filters, input under voltage, output current limiting,
short-circuit protection, and thermal shutdown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_EMH-54/3-Q48N-C.A10 Page 1 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Root Model
EMH-54/3-Q48
Input
VOUT
(Volts)
IOUT
(Amps,
Max.)
(Watts)
Typ.
Max.
Line
Load
VIN Nom.
(Volts)
54
3
162
250
350
±0.125%
±0.2%
48
Power
R/N (mV pk-pk)
Regulation (Max.)
Please refer to the full part number structure for additional ordering part numbers and options.
All specifications are typical at nominal line voltage and full load, +25ºC. unless otherwise noted.
Units are tested with a 1uF ceramic external output capacitor and a 100uf and 2.2uF external input
capacitor.
Range
(Volts)
IIN, no
load
(mA)
IIN, full
load
(Amps)
18-72
40
3.67
Efficiency
Min.
Typ.
89.5% 91.5%
Dimensions
with
baseplate
(Inches)
2.4x2.3x0.5
Full power continuous output requires baseplate installation. Please refer to the derating curves.
PART NUMBER STRUCTURE
EMH - 54 / 3 - Q48 N B - Lx C
Ethernet-Module
Half Brick Series
Nominal Output Voltage
Maximum Output Current
in Amps
Input Voltage Range:
Q48 = 18-72 Volts (48V nominal)
RoHS Hazardous Materials compliance
C = RoHS-6 (no lead), standard, does not claim EU exemption 7b – lead in solder
Pin length option
Blank = standard pin length 0.180 in. (4.6 mm)
L1 = 0.110 in. (2.79 mm)*
L2 = 0.145 in. (3.68 mm)*
Baseplate
Blank = No baseplate, standard
B = Baseplate installed
On/Off Control Logic
N = Negative logic, standard
Note: Some model combinations may
not be available. Contact Murata Power
Solutions for availability.
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MDC_EMH-54/3-Q48N-C.A10 Page 2 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
FUNCTIONAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Conditions
Minimum
Full power operation
Input to output tested
None, install external fuse
Power on or off, referred to -Vin
0
Typical/Nominal
Maximum
Units
72
2250
Vdc
Vdc
Vdc
Vdc
W
None
0
0
15
164.32
Current-limited, no damage,
0.2
3
A
short-circuit protected
Storage Temperature Range
Vin = Zero (no power)
-55
125
°C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in
the Performance/Functional Specifications Table is not implied nor recommended.
Output Current
INPUT
Operating voltage range
Turn On/Start-up threshold
Ambient temperature > 60°C
Turn Off/Undervoltage lockout
Turn-On/Turn-Off Hysteresis
Reverse Polarity Protection
Recommended External Fuse
Internal Filter Type
Input current
Full Load Conditions
Low line input current
Inrush Transient
Short Circuit Input Current
No Load Input Current
Shutdown Mode Input Current (Off, UV, OT)
Reflected (back) ripple current
Rising input voltage
Tested at 2.6A
18
16.5
48
17.5
15
1.0
17
1.05
None
20
L-C
None, install external fuse
Fast blow
Vin = nominal
Vin @ Min. @2.6A
3.67
8.52
0.1
250
40
5
40
Iout = minimum, unit=ON
Measured at input with specified filter
72
18
19
17.5
1.2
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
A
3.83
8.84
A
A
A2-Sec.
mA
mA
mA
mA, p-p
350
80
10
80
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage: no baseplate
Isolation Voltage: with baseplate
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety (Designed to meet the following
requirements)
Calculated MTBF
Vin = 48V, full load
Vin = 24V, full load
Vin = 18V, full load
89.5
89.5
89.5
Input to output, continuous
Input to output, continuous
Input to Baseplate, continuous
Output to Baseplate, continuous
2250
2250
1500
750
91.5
91.5
91
%
%
%
Vdc
Vdc
basic
100
5,000
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition
Per Telcordia SR332, issue 1 class 3, ground fixed,
Tambient=+25°C
Mohm
pF
Yes
1.8+
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
387
Power On to Vout regulated 10-90%
(50% resistive load)
Remote ON to 10% Vout (50% resistive load)
50-75-50% load step, settling time to within ±2%
of Vout
same as above
430
473
KHz
40
60
mS
30
50
mS
300
450
µSec
±1000
±1250
mV
1
0.8
15
2
V
V
mA
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
Base Plate
ON = Pin grounded or external voltage
OFF = Pin open or external voltage
open collector/drain
“B” suffix
-0.7
5
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MDC_EMH-54/3-Q48N-C.A10 Page 3 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
FUNCTIONAL SPECIFICATIONS (CONT.)
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range: 24-72 Vin
Output Current Range: 18-24 Vin
Minimum Load
Current Limit Inception
Short Circuit
Short Circuit Current
See Derating
0.0
161.1
164.32
W
No trim
At 50% load
User-adjustable
Via magnetic feedback
52.626
-2
53.7
54.774
2
67
Vdc
% of Vnom.
% of Vnom.
Vdc
N/A
65
0.2
0.2
3
2.6
0.2
3.9
3
2.6
A
A
4.7
A
Hiccup technique, autorecovery within ±1% of
Vout, non-latching
0.5
1
A
Output shorted to ground, no damage
Continuous
±0.125
±0.2
350
%
%
mV pk-pk
% of Vnom./°C
μF
98% of Vnom., after warmup
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
3.2
Current limiting
Vin=min. to max. Vout=nom., 50% load
Iout=min. to max. Vin=48V.
5 Hz- 20 MHz BW
At all outputs
Low ESR, resistive load
250
0.02
0
3300
MECHANICAL (Through Hole Models)
Outline Dimensions (open frame)
2.4 x 2.3 x 0.43
61.0 x 58.4 x 10.92
2.4 X 2.3 X 0.5
61.0 x 58.4 x 12.7
2.3
67.13
0.04 & 0.080
1.016 & 2.032
Copper alloy
50
5
Aluminum
Outline Dimensions (with baseplate)
LxWxH (Please refer to outline drawing)
Weight (with baseplate)
Through Hole Pin Diameter
See mechanical drawing
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
Case or Baseplate Material
Inches
mm
Inches
mm
Ounces
Grams
Inches
mm
µ-inches
µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Ambient Temperature Range with
Baseplate
Absolute Operating Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
With derating
Maximum baseplate temperature: Converter delivers
full rated power at max baseplate temp.
Measured @ Thermistor or in the middle of baseplate
Vin = Zero (no power)
Notes
External filter required
Unless otherwise noted, all specifications are at nominal input voltage, nominal output voltage and full
load. General conditions are +25° Celsius ambient temperature, near sea level altitude, natural convection airflow. All models are tested and specified with an external 1 µF multi-layer ceramic output
capacitor. The external input capacitors are 100uF and 2.2uF ceramic. All capacitors are low-ESR
types wired close to the converter. These capacitors are necessary for our test equipment and may
not be needed in the user’s application.
The module will operate when input voltage is within the 18-72V Operating Voltage Range. Output
regulation at full load will be achieved only when Vin ≥ 18V.
-40
85
°C
-40
100
°C
-40
-40
125
105
125
140
°C
°C
135
B
Class
B
RoHS-6
Class
Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is
Cbus = 220 µF, Cin = 33 µF and Lbus = 12 µF.
The Remote On/Off Control is referred to -Vin.
Over-current protection is non-latching with auto reovery (Hiccup)
Regulation specifications describe the output voltage changes as the line voltage or load current is
varied from its nominal or midpoint value to either extreme.
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MDC_EMH-54/3-Q48N-C.A10 Page 4 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
TYPICAL PERFORMANCE DATA
Maximum Current Temperature Derating vs. Airflow
(Vin = 24V, airflow from from Pin 1 to Pin 4 on PCB, no Baseplate)
4
4
3
3
2
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
1
0
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating vs. Airflow
(Vin = 18, airflow from Pin 1 to Pin 4 on PCB, no Baseplate)
30
35
40
45
50
55
60
65
70
75
80
2
1
0
85
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
30
35
40
45
4
3
3
0
Output Current (Amps)
Output Current (Amps)
4
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
1
30
35
40
45
50
55
60
65
70
75
80
1
0
85
30
3
3
Output Current (Amps)
Output Current (Amps)
4
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
35
40
45
50
55
60
65
70
75
80
85
80
85
Maximum Current Temperature Derating vs. Airflow
(Vin = 72V, airflow from from Pin 1 to Pin 4 on PCB, no Baseplate)
4
0
65
Ambient Temperature (°C)
Maximum Current Temperature Derating vs. Airflow
(Vin = 60, airflow from Pin 1 to Pin 4 on PCB, no Baseplate)
1
60
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2
Ambient Temperature (°C)
2
55
Maximum Current Temperature Derating vs. Airflow
(Vin = 48V, airflow from from Pin 1 to Pin 4 on PCB, no Baseplate)
Maximum Current Temperature Derating vs. Airflow
(Vin = 36, airflow from Pin 1 to Pin 4 on PCB, no Baseplate)
2
50
Ambient Temperature (°C)
Ambient Temperature (°C)
70
75
80
85
2
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
1
0
30
35
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
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MDC_EMH-54/3-Q48N-C.A10 Page 5 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
TYPICAL PERFORMANCE DATA
Maximum Current Temperature Derating vs. Airflow
(Vin = 24V, airflow from from Pin 1 to Pin 4 on PCB, with baseplate)
4
4
3
3
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2
1
0
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating vs. Airflow
(Vin = 18, airflow from Pin 1 to Pin 4 on PCB, with Baseplate)
30
35
40
45
50
55
60
65
70
75
80
1
0
85
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2
30
35
40
45
Ambient Temperature (°C)
3
3
Output Current (Amps)
Output Current (Amps)
4
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
1
30
35
40
45
50
55
60
65
70
75
80
0
85
3
Output Current (Amps)
Output Current (Amps)
3
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
1
40
45
50
55
60
65
Ambient Temperature (°C)
80
85
30
35
40
45
50
55
60
65
70
75
80
85
80
85
Maximum Current Temperature Derating vs. Airflow
(Vin = 72V, airflow from from Pin 1 to Pin 4 on PCB, with baseplate)
4
35
75
Ambient Temperature (°C)
4
30
70
1
Maximum Current Temperature Derating vs. Airflow
(Vin = 60, airflow from Pin 1 to Pin 4 on PCB, with Baseplate)
0
65
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2
Ambient Temperature (°C)
2
60
Maximum Current Temperature Derating vs. Airflow
(Vin = 48V, airflow from from Pin 1 to Pin 4 on PCB, with baseplate)
4
0
55
Ambient Temperature (°C)
Maximum Current Temperature Derating vs. Airflow
(Vin = 36, airflow from Pin 1 to Pin 4 on PCB, with Baseplate)
2
50
70
75
80
85
0.33 m/s (65 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2
1
0
30
35
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
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MDC_EMH-54/3-Q48N-C.A10 Page 6 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
TYPICAL PERFORMANCE DATA
Startup Delay (Vin=48V, Iout=3A, Ta=+25°C) Trace 1=Vin, Trace 4=Vout.
Efficiency (%)
Efficiency vs Line Voltage and Load Current @ +25°C
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
Vin = 18V
Vin = 24V
Vin = 36V
Vin = 48V
Vin = 60V
Vin = 75V
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6 2.8
3
Load Current (Amps)
On/Off Enable Delay (Vin=48V, Iout=3A, Ta=+25°C) Trace 1=Enable, Trace 4=Vout.
Stepload Transient Response (Vin=48V, Iout =50-75-50%, Ta=+25°C)
Output Ripple and Noise (Vin=48V, Vout=nom, Iout=0A, Cload=1uF, Ta=+25°C)
Output Ripple and Noise (Vin=48V, Vout=nom, Iout=3A, Cload=1uF, Ta=+25°C)
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MDC_EMH-54/3-Q48N-C.A10 Page 7 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
TYPICAL PERFORMANCE DATA
Thermal image with hot spot at 2.9A with 25°C ambient temperature. Natural convention is
used with no forced airflow. Identifiable and recommended maximum value to be verified in
application. Vin=48V, T3 and Q12 max temp=128°C/IPC9592 guidelines.
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MDC_EMH-54/3-Q48N-C.A10 Page 8 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
MECHANICAL SPECIFICATIONS – OPEN FRAME
1.900
[48.26]
MOUNTING PLANE
(PIN SHOULDERS)
1
0.700
[17.78]
CL
0.300
[7.62]
2.40
[60.96]
9
0.700
[17.78]
1.400
[35.56]
3
4
3x .040
PINS 1, 3 & 4
2.300
[58.42]
SIDE VIEW
TOP VIEW
5
2x .080
PINS 5 & 9
0.95
[24.1]
CL
BOTTOM VIEW
0.43 [10.92]
END VIEW
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
INPUT/OUTPUT CONNECTIONS
Pin
Function
1
Negative Input
2
Omitted
3
Remote On/Off
4
Positive Input
5
Positive Output
6
Omitted
7
Omitted
8
Omitted
9
Negative Output
MATERIAL:
FINISH: (ALL PINS)
.080 PINS: COPPER ALLOY
.040 PINS: COPPER ALLOY
FINISH: (ALL PINS)
GOLD (5u”MIN) OVER NICKEL (50u” MIN)
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MDC_EMH-54/3-Q48N-C.A10 Page 9 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
MECHANICAL SPECIFICATIONS – WITH BASEPLATE
[58.4]
2.30
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
[61.0]
2.40
2.000
[50.8]
TOP VIEW
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
0.112-40-UNC-2B
0.25 MIN DEEP (4 PLS)
Components are shown for reference only.
1.900
[48.26]
ALUMINUM BASEPLATE
END VIEW
0.015 [.381] MIN
CLEARANCE
[12.7±0.38]
0.5±.015
MTG PLANE
SIDE VIEW
0.071 .002 VENTED
SHOULDER AT EACH
0.040±.002
(PINS 1, 3-4)
0.080±.002
(PINS 5 & 9)
1.900
[48.26]
INPUT/OUTPUT CONNECTIONS
Pin
Function
1
Negative Input
2
Omitted
3
Remote On/Off
4
Positive Input
5
Positive Output
6
Omitted
7
Omitted
8
Omitted
9
Negative Output
PIN 9
PIN 1
1.400
PIN 3
0.300
[7.62] 0.700
PIN 4
CL [35.56]
[17.78]
PIN 5
[24.1]
0.95
CL
BOTTOM VIEW
PIN 1
MATERIAL:
.040 PINS: COPPER ALLOY
.080 PINS: COPPER ALLOY
FINISH: (ALL PINS)
GOLD (5u"MIN) OVER NICKEL (50u" MIN)
ISOMETRIC VIEW
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MDC_EMH-54/3-Q48N-C.A10 Page 10 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
RECOMMENDED FOOTPRINT (VIEW THROUGH CONVERTER)
TOP VIEW
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
58.9
2.32
FINISHED HOLE SIZES
@ PINS 1, 3 AND 4
.150MIN
@5 & 9 FOR PIN
SHOULDERS
(PER IPC-D-275, LEVEL C)
.048-.062
(PRI)
(SEC)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
4
17.78
.700
5
3
7.62
.300
CL
.100 MIN
@ 1, 3, AND 4
FOR PIN
SHOULDERS
61.5
2.42
CL
35.56
1.400
1
9
24.13
.950
CL
48.26
1.900
FINISHED HOLE SIZES
@ PINS 5 & 9
(PER IPC-D-275, LEVEL C)
.088-.102
IT IS RECOMMENDED THAT NO PARTS
BE PLACED BENEATH CONVERTER
STANDARD PACKAGING
Each static dissipative
polyethylene foam tray
accommodates 9 converters
in a 3 x 3 array
Carton inside dimensions:
10" x 10" x 4.25"
(4 trays of 9)
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MDC_EMH-54/3-Q48N-C.A10 Page 11 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. For greatest
safety, we recommend a fast blow fuse installed in the ungrounded input supply
line.
The installer must observe all relevant safety standards and regulations. For
safety agency approvals, install the converter in compliance with the end-user
safety standard, i.e. IEC/EN/UL 60950-1.
Input Reverse-Polarity Protection
If the input voltage polarity is reversed, an internal diode will become forward
biased and likely draw excessive current from the power source. If this source is
not current-limited or the circuit appropriately fused, it could cause permanent
damage to the converter.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the ramping-up input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specifications). Once operating, converters will not turn off until the
input voltage drops below the Under-Voltage Shutdown Limit. Subsequent restart
will not occur until the input voltage rises again above the Start-Up Threshold. This
built-in hysteresis prevents any unstable on/off operation at a single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor
recharges. Such situations could oscillate. To prevent this, make sure the operating
input voltage is well above the UV Shutdown voltage AT ALL TIMES.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifications) is the time interval between the point when the
ramping input voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capacitance,
input voltage slew rate and final value of the input voltage as it appears at the
converter.
These converters include a soft start circuit, which limits the duty cycle of the
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to Vout regulated
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified accuracy
band. The specification assumes that the output is fully loaded at maximum rated
current. Similar conditions apply to the On to Vout regulated specification such as
external load capacitance and soft start circuitry.
Input Source Impedance
These converters will operate to specifications without external components,
assuming that the source voltage has very low impedance and reasonable input
voltage regulation. Since real-world voltage sources have finite impedance,
performance is improved by adding external filter components. Sometimes only
a small ceramic capacitor is sufficient. Since it is difficult to totally characterize
all applications, some experimentation may be needed. Note that external input
capacitors must accept high speed switching currents.
Because of the switching nature of DC/DC converters, the input of these converters must be driven from a source with both low AC impedance and adequate
DC input regulation. Performance will degrade with increasing input inductance.
Excessive input inductance may inhibit operation. The DC input regulation specifies
that the input voltage, once operating, must never degrade below the Shut-Down
Threshold under all load conditions. Be sure to use adequate trace sizes and
mount components close to the converter.
I/O Filtering, Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected ripple
current and output noise using designated external input/output components, circuits
and layout as shown in the figures below. External input capacitors (Cin in the figure)
serve primarily as energy storage elements, minimizing line voltage variations caused
by transient IR drops in the input conductors. Users should select input capacitors for
bulk capacitance (at appropriate frequencies), low ESR and high RMS ripple current
ratings. In the figure below, the Cbus and Lbus components simulate a typical DC
voltage bus. Your specific system configuration may require additional considerations.
Please note that the values of Cin, Lbus and Cbus will vary according to the specific
converter model.
In critical applications, output ripple and noise (also referred to as periodic and
TO
OSCILLOSCOPE
CURRENT
PROBE
+INPUT
VIN
+
–
+
–
LBUS
CBUS
CIN
-INPUT
CIN = 33µF, ESR < 700mΩ @ 100kHz
CBUS = 220µF, ESR < 100mΩ @ 100kHz
LBUS = 12µH
Figure 1. Measuring Input Ripple Current
random deviations or PARD) may be reduced by adding filter elements such as
multiple external capacitors. Be sure to calculate component temperature rise from
reflected AC current dissipated inside capacitor ESR. Our Application Engineers
can recommend potential solutions.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating” with respect
to their input. The essential feature of such isolation is ideal ZERO CURRENT FLOW
between input and output. Real-world converters however do exhibit tiny leakage
currents between input and output (see Specifications). These leakages consist of
both an AC stray capacitance coupling component and a DC leakage resistance.
When using the isolation feature, do not allow the isolation voltage to exceed
specifications. Otherwise the converter may be damaged. Designers will normally
use the negative output (-Output) as the ground return of the load circuit. You
can however use the positive output (+Output) as the ground return to effectively
reverse the output polarity.
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MDC_EMH-54/3-Q48N-C.A10 Page 12 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
+OUTPUT
5
C1
-OUTPUT
SCOPE
RLOAD
9
C1 = 1µF CERAMIC
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 2. Measuring Output Ripple and Noise (PARD)
Thermal Shutdown
To prevent many over temperature problems and damage, these converters include
thermal shutdown circuitry. If environmental conditions cause the temperature of
the DC/DC’s to rise above the Operating Temperature Range up to the shutdown
temperature, an on-board electronic temperature sensor will power down the unit.
When the temperature decreases below the turn-on threshold, the converter will
automatically restart. There is a small amount of hysteresis to prevent rapid on/off
cycling. The temperature sensor is typically located adjacent to the switching controller, approximately in the center of the unit. See the Performance and Functional
Specifications.
CAUTION: If you operate too close to the thermal limits, the converter may shut
down suddenly without warning. Be sure to thoroughly test your application to
avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of conditions. The derating curves show the maximum continuous ambient air temperature
and decreasing maximum output current which is acceptable under increasing
forced airflow measured in Linear Feet per Minute (“LFM”). Note that these are
AVERAGE measurements. The converter will accept brief increases in temperature
and/or current or reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter itself
which is obviously running at higher temperature than the outside air. Also note
that very low flow rates are similar to “natural convection,” that is, not using fanforced airflow.
Murata Power Solutions makes characterization measurements in a closed loop
wind tunnel with measured airflow. We use both thermocouples and an infrared
camera system to observe thermal performance. If in doubt, contact Murata
Power Solutions to discuss placement and measurement techniques of suggested
temperature sensors.
CAUTION: If you routinely or accidentally exceed these Derating guidelines, the
converter may have an unplanned Over Temperature shut down. Also, these graphs
are all collected at slightly above Sea Level altitude. Be sure to reduce the derating
for higher density altitude.
Output Overvoltage Protection
This converter monitors its output voltage for an over-voltage condition using an
on-board electronic comparator. If the output exceeds OVP limits, the sensing
circuit will power down the unit, and the output voltage will decrease. After a
time-out period, the PWM will automatically attempt to restart, causing the output
voltage to ramp up to its rated value. It is not necessary to power down and reset
the converter for this automatic OVP-recovery restart.
If the fault condition persists and the output voltage climbs to excessive levels,
the OVP circuitry will initiate another shutdown cycle. This on/off cycling is referred
to as “hiccup” mode.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However your output application circuit may need additional protection.
In the extremely unlikely event of output circuit failure, excessive voltage could be
applied to your circuit. Consider using an appropriate fuse in series with the output.
Output Current Limiting
As soon as the output current increases to its maximum rated value, the DC/
DC converter will enter a power-limiting mode. The output voltage will decrease
proportionally with increases in output current, thereby maintaining a somewhat
constant power output. This is commonly referred to as power limiting.
Current limiting inception is defined as the point at which full power falls below
the rated tolerance. See the Performance/Functional Specifications. Note particularly that the output current may briefly rise above its rated value. This enhances
reliability and continued operation of your application. If the output current is too
high, the converter will enter the short circuit condition.
Output Short Circuit Condition
When a converter is in power-limit mode, the output voltage will drop as the output
current demand increases. If the output voltage drops too low, the magnetically
coupled voltage used to develop primary side voltages will also drop, thereby
shutting down the PWM controller. Following a time-out period, the PWM will
restart, causing the output voltage to begin ramping up to its appropriate value. If
the short-circuit condition persists, another shutdown cycle will initiate. This on/
off cycling is called “hiccup mode”. The hiccup cycling reduces the average output
current, thereby preventing excessive internal temperatures. A short circuit can be
tolerated indefinitely.
Remote On/Off Control
Negative: Optional negative-logic devices are on (enabled) when the On/Off is
grounded or brought to within a low voltage (see Specifications) with respect to –
Vin. The device is off (disabled) when the On/Off is pulled high to +Vin with respect
to –Vin.
Dynamic control of the On/Off function should be able to sink appropriate signal
current when brought low and withstand appropriate voltage when brought high.
Be aware too that there is a finite time in milliseconds (see Specifications) between
the time of On/Off Control activation and stable, regulated output. This time will
vary slightly with output load type and current and input conditions.
There are two CAUTIONs for the On/Off Control:
CAUTION: While it is possible to control the On/Off with external logic if you
carefully observe the voltage levels, the preferred circuit is either an open drain/
open collector transistor or a relay (which can thereupon be controlled by logic).
CAUTION: Do not apply voltages to the On/Off pin when there is no input voltage. Otherwise the converter may be permanently damaged.
Power Over Ethernet (PoE)
Power over Ethernet (PoE) supports the implementation of the IEEE 802.3af and
IEEE 802.3at standards; this implementation allows both data and electrical power
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MDC_EMH-54/3-Q48N-C.A10 Page 13 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
Soldering Guidelines
+VIN
+VCC
ON/OFF
CONTROL
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications
may cause damage to the product. Be cautious when there is high atmospheric humidity. We
strongly recommend a mild pre-bake (100° C. for 30 minutes). Your production environment
may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
–VIN
For Sn/Pb based solders:
Maximum Preheat Temperature
115° C.
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
270° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
7 seconds
Maximum Solder Dwell Time
6 seconds
Figure 3. Driving the Negative Logic On/Off Control Pin
to pass over a copper Ethernet LAN cable. PoE permits electric power, along with
data, to be passed over a copper Ethernet LAN cable. Powered devices, such as
voice-over-IP telephones, wireless access points, video cameras, and point-of-sale
devices, that support PoE can receive power safely from the access ports that
are used to connect personal computers to the network. IEEE 802.3at increases
the amount of power to 30W. The PoE standard provides support for legacy PoE
devices. An IEEE 802.af powered device can operate normally when connected to
IEEE 802.at power sourcing equipment.
Standard
IEEE 802.3af (PoE)
and IEEE 802.3at (PoE +)
IEEE 802.3at (PoE+)
Class
Maximum Power
delivered by PoE port
Power range of
powered device
0
1
2
3
4
15.4 W
4W
7.0 W
15.4 W
30.0 W
0.44 through 12.95 W
0.44 through 3.84 W
3.84 through 6.49 W
6.49 through 12.95 W
12.95 through 25.5 W
Table 1. Class of Powered Device and Power Levels
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MDC_EMH-54/3-Q48N-C.A10 Page 14 of 15
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
IR Transparent
optical window
Unit under
test (UUT)
Variable
speed fan
IR Video
Camera
Heating
element
Precision
low-rate
anemometer
3” below UUT
Ambient
temperature
sensor
Airflow
collimator
Vertical Wind Tunnel
Murata Power Solutions employs a computer controlled
custom-designed closed loop vertical wind tunnel, infrared
video camera system, and test instrumentation for accurate
airflow and heat dissipation analysis of power products. The
system includes a precision low flow-rate anemometer, variable
speed fan, power supply input and load controls, temperature
gauges, and adjustable heating element.
The IR camera monitors the thermal performance of the
Unit Under Test (UUT) under static steady-state conditions. A
special optical port is used which is transparent to infrared
wavelengths.
Both through-hole and surface mount converters are
soldered down to a host carrier board for realistic heat absorption and spreading. Both longitudinal and transverse airflow
studies are possible by rotation of this carrier board since there
are often significant differences in the heat dissipation in the
two airflow directions. The combination of adjustable airflow,
adjustable ambient heat, and adjustable Input/Output currents
and voltages mean that a very wide range of measurement
conditions can be studied.
The collimator reduces the amount of turbulence adjacent
to the UUT by minimizing airflow turbulence. Such turbulence
influences the effective heat transfer characteristics and gives
false readings. Excess turbulence removes more heat from
some surfaces and less heat from others, possibly causing
uneven overheating.
Both sides of the UUT are studied since there are different
thermal gradients on each side. The adjustable heating element
and fan, built-in temperature gauges, and no-contact IR camera
mean that power supplies are tested in real-world conditions.
Figure 4. Vertical Wind Tunnel
Murata Power Solutions, Inc.
129 Flanders Rd, Westborough, MA 01581 USA
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: https://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical
information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of
licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice.
© 2020 Murata Power Solutions, Inc.
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MDC_EMH-54/3-Q48N-C.A10 Page 15 of 15
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