MR75-xxSRW
Series
Compact, 75W
Wide Input Railway
DC/DC Converter
Electrical Specifications
Specifications typical @ +25°C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice.
Input
Key Features:
•
75W Output Power
•
Meets EN 50155
•
EN 60950 Approved
•
EN 50121-3-2 Compliant
•
Wide Input Range
•
3,000 VAC rms Isolation
•
Reinforced Insulation
•
92% Efficiency
•
Meets EN 61373
•
Remote On/Off
Parameter
Input Voltage Range
Input Start Voltage
Under Voltage Shutdown
Input Filter
Conditions
Min.
72 VDC Input 43.0
110 VDC Input 66.0
72 VDC Input
110 VDC Input
72 VDC Input
110 VDC Input
PI ( ) Filter
Conditions
V
IN
= Min to Max
I
OUT
= 0% to 100%
See Note 1
25% Load Change
Min.
Typ.
72.0
110.0
Max.
101.0
160.0
43.0
66.0
Units
VDC
VDC
VDC
40.0
63.0
Output
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Ripple & Noise (20 MHz)
Transient Response Time, See Note 2
Temperature Coefficient
Output Over Load Protection
Output Short Circuit
Typ.
Max.
±1.0
±0.2
±0.3
150
±0.02
See Note 3
150
Continuous (Hiccup Mode)
Conditions
Input/Output
Input/Output to Case
500 VDC
100 kHz/1V
Min.
3,000
1,500
1,000
Typ.
Max.
Units
%
%
%
mV Pk-Pk
µS
%/°C
%I
OUT
250
General
Parameter
Isolation Voltage, Reinforced Insulation
Isolation Resistance
Isolation Capacitance
Switching Frequency
Units
VAC rms
VDC
M
pF
kHz
Units
°C
°C/W
3,000
320
Environmental
Parameter
Operating Temperature Range
Thermal Impedance, Without Heat Sink
Conditions
Ambient, See Note 4
Natural Convection
100 LFM
200 LFM
400 LFM
Natural Convection
100 LFM
200 LFM
400 LFM
Base Plate
Base Plate
RH, Non-condensing
Min.
-40
7.5
6.1
5.3
3.9
6.8
4.1
3.3
2.2
-40
Typ.
+25
Max.
+61
Thermal Impedance, With Heat Sink
Operating Temperature Range
Thermal Shutdown
Cooling
Humidity
°C/W
+105
°C
+110
°C
See Derating Curves (Page 3)
95
%
Physical
Case Size
Case Material
Weight
2.28 x 1.45 x 0.78 Inches (57.90 x 36.8 x 20.00 mm)
Black Anodized Aluminum Case with Aluminum Plate/Heat Sink
2.6 Oz (74.0g)
Conditions
Min.
Typ.
Max.
3.5 VDC - 12.0 VDC or Open Circuit
0 VDC - 1.2 VDC or Short Circuit
V
CTRL
= 5V
0.5
V
CTRL
= 0V
-0.5
Referenced to -V
IN
(Pin 3)
2.5
Min.
143.8
Min.
-0.7
-0.7
Typ.
Max.
Units
MicroPower Direct
292 Page Street
Suite D
Stoughton, MA 02072
USA
T:
(781) 344-8226
F:
(781) 344-8481
E:
sales@micropowerdirect.com
W:
www.micropowerdirect.com
Remote On/Off
Parameter
Unit On
Unit Off
Control Input Current, ON
Control Input Current, OFF
Control Common
Standby Input Current
mA
mA
mA
Units
kHrs
Units
VDC
°C
Reliability Specifications
Conditions
MIL HDBK 217F, 25°C, Gnd Benign
Absolute Maximum Ratings,
See Note 5
Parameter
Conditions
77 VDC Input
Input Voltage Surge (100 mS)
110 VDC Input
Lead Temperature
1.5 mm From Case for 10 Sec
Parameter
MTBF
Typ.
Max.
165.0
250.0
260
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Model Selection Guide
Model
Number
MR75-72S05RW
MR75-72S12RW
MR75-72S15RW
MR75-72S24RW
MR75-110S05RW
MR75-110S12RW
MR75-110S15RW
MR75-110S24RW
Input
Voltage
(VDC)
Nominal
Range
72
43 - 101
72
43 - 101
72
43 - 101
72
43 - 101
110
66 - 160
110
66 - 160
110
66 - 160
110
66 - 160
Current
(mA)
Full-Load No-Load
1,170
50
1,132
45
1,132
45
1,145
55
766
40
749
35
749
35
758
50
Output
Voltage
(VDC)
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Current
(A)
Fuse
Over
Reflected
Voltage Capacitive Efficiency
Rating
Ripple
Load
Current Protection
(µF, Max)
(%, Typ)
Slow-Blow
(mA Typ)
(VDC)
(mA)
5.0
12.0
15.0
24.0
5.0
12.0
15.0
24.0
15.000
6.250
5.000
3.125
15.000
6.250
5.000
3.125
35
35
35
35
35
35
35
35
6.2
15
18
27
6.2
15
18
27
25,500
4,400
2,800
1,100
25,500
4,400
2,800
1,100
89
92
92
91
89
91
91
90
3,200
3,200
3,200
3,200
2,100
2,100
2,100
2,100
Notes:
1. Output noise is measured with a 10
µF
tantalum capacitor and a 1.0
µF
ceramic capacitor connected
in parallel across the output. Ripple & noise is 150 mV typical for 24 VDC output models.
2. Transient recovery is measured to within a 1% error band for a load step change of 75% to 100%.
3. Output overload protection is provided by a “hiccup” mode circuit
4. The ambient temperature range is the maximum possible for a converter with a heatsink mounted.
Natural convection is 20 LFM, not “still air”. See the power derating curves on page 3 for the operating
temperature limits for specific models.
5. Exceeding absolute maximum ratings may damage the module. These are not
continuous operating ratings.
7. Operation at no-load will not damage these units, but they may not meet all specifications.
8. If the remote sense outputs are not used, the +Sense (pin 7) should be connected to
+V
OUT
(pin 8) and the -Sense (pin 5) should be connected to -V
OUT
(pin 4).
9. It is recommended that a fuse be used on the input of a power supply for protection. For the
correct rating, see the model selection table above.
EMC Specifications
Parameter
Radiated Emissions
Conducted Emissions
ESD
RS
EFT
Surge
CS
Standard
See Note 1
EN 50121
See Note 1
EN 55011
EN 61000-4-2
EN 61000-4-3
See Note 2
EN 61000-4-4
See Note 2
EN 61000-4-5
EN 61000-4-6
Level
Class A
Class A
Criteria A; ±8 kV Air, ±6 kV Contact
Criteria A; 10V/m
Criteria A; ±2 kV
Criteria A; ±1 kV
Criteria A; 10 V/m
Notes:
1. To meet EN 55011 Class A, and EN 50121-3-2, an external
input filter is required. See the connection diagram below
for a typical circuit.
2. To meet EN 61000-4-4 and EN 61000-4-5, a capacitor
should be connected across the input pins. See the con-
nection diagram below for a typical example.
Environmental Standards
Parameter
Vibration & Shock
Cooling Test
Dry Heat
Damp Heat
Standard
EN 61373
EN 60068-2-1
EN 60068-2-2
EN 60068-2-30
Typical Connection
For applications that require meeting EMC/EMI standards, the diagram above 4. Recommended values for components are:
illustrates a typical connection of the
MR75-xxxSxxRW
series. The units
Component
110 V
IN
72 V
IN
do not require external components to operate as specified. Some notes on
Fuse
3,200 mA
2,100 mA
this diagram (starting with the input circuit) are:
68
µF/200V
68
µF/200V
C
1
1. It is recommended that an external slow blow fuse be used. The recom-
mended fuse rating is shown in the table at right.
450
µH
450
µH
L
1
2. To meet EN 55011 Class A & EN 50121-3-2, an external input filter
2,200 pF/3 kV
2,200 pF/3 kV
C
3
is required. In the diagram this filter consists of C
1
and L
1
. The recom-
2,200 pF/3 kV
2,200 pF/3 kV
C
4
mended component values are shown in the table at right.
2,200 pF/3 kV
2,200 pF/3 kV
C
5
3. To meet EN 61000-4-4 and EN 61000-4-5, a capacitor should be
2,200 pF/3 kV
2,200 pF/3 kV
C
6
connected across the input pins. In the connection diagram above,
4.7
µF
4.7
µF
C
7
the value of C
1
should be changed to
470
µF/200V.
5. The circuit consisting of R
1
, Q
1
and C
2
illustrates a simple open collector connection
for the remote on/off control. The resistor (R
1
) limits the current on the control
line and the capacitor (C
2
) bypasses noise spikes, helping to prevent phantom
triggering of the control. If the control pin is not being used, it should be left open.
7. The resister R
2
is connected as an output adjust. The output adjustment capability
is explained further on page 3.
8. The output sense pins (pin 7 and pin 5) may be used to compensate for the losses
incurred over long leads to an output load. If not used for load compensation or
output adjustment, the sense pins should be connected directly to the appropriate
output pins, pin 7 to pin 8 and pin 5 to pin 4.
9. The output filtering capacitor (C
7
) is a low ESR (<1 ) electrolytic capacitor.
Care must be taken in choosing this capacitor not to exceed the capacitive load
specification for the unit.
292 Page Street Ste D Stoughton, MA 02072
•
TEL: (781) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
Output Voltage Adjustment
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A simple external circuit may be used to adjust the
converter output. The range of adjustment is ±10%.
To adjust the output down, connect a 5%, 3W resistor
from the plus sense pin (7) to the V
OUT
trim pin (6). To
adjust the output up, connect a 5%, 3W resistor from
the minus sense pin (5) to the V
OUT
trim pin. For up/
down trimming, connect a 10 k potentiometer from
the plus to the minus sense pins. Connect the wiper
arm to the V
OUT
trim pin.
For a table of trim resistor values, contact the factory.
Mechanical Dimensions
Pin Connecti
Connections
Pin
1
2
3
4
5
6
7
8
Description
+V
IN
Remote On/Off
On
-V
IN
-V
OUT
-Sense
Trim
+Sense
+V
OUT
Mechanical Dimensions
- With Optional Heatsink
For the heatsink option, add suffix “H” to the
model number (i.e.
MR75-110S12RW-H)
MicroPower Direct
We Power Your Success - For Less!
292 Page Street Ste D Stoughton, MA 02072
•
Mechanical Notes:
•
All dimensions are typical in inches (mm)
•
Tolerance x.xx = ±0.02 (±0.50)
TEL: (781) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
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