Optimized for harsh environments in industrial/railway applications, the IRS DC-DC converter
series offer regulated outputs in an industry-standard sixteen-brick fully encased package.
FEATURES
efficiency synchronous flyback topology
High
18-75 Volts DC wide input range with 3.3, 5 and
12 Volts for Output voltage
to 54 Watts total output power with over-
Up
temperature shutdown
1.44" x 1.04" x 0.50" baseplate package
Tiny
Industry standard DOSA "brick" format and pinout
Extensive self-protection shut down features
Small footprint DC-DC converter, ideal for high
current applications
Volt Basic input/output isolation (48V models)
2250
Operating temperature range -40 to +85°C with
derating
Stable no-load operation with no required exter-
nal components
Certified to UL 60950-1, 2nd Edition, EN60950-1
safety approvals
PRODUCT OVERVIEW
The world of “brick” DC-DC converters has seen
a steady size reduction. The IRS series makes
another dramatic size shrink down to a “sixteenth-
brick” width (0.90 inches) while still retaining a
high power output and full 2250 Volt DC isolation.
The PC-board mount converter family accepts
18 to 75 Volts DC inputs and delivers fixed outputs
regulated to within ±0.125%. The IRS converters
are ideal for datacom and telecom applications,
cell phone towers, data centers, server farms and
network repeaters.
IRS outputs may be trimmed while delivering fast
settling to current step loads and no adverse effects
from higher capacitive loads. Excellent ripple and
noise specifications assure compatibility to circuits
using CPU’s, ASIC’s, programmable logic and
FPGA’s. No minimum load is required. For systems
requiring controlled startup/shutdown, an external
remote On/Off control may use a switch, transistor
or digital logic.
Many self-protection features on the IRS series
avoid both converter and external circuit hazards.
These include input undervoltage lockout and
overtemperature shutdown. The output of these
DC-DC converters have current limit using the
“hiccup” autorestart technique and the outputs may
be short-circuited indefinitely. Additional features
include output overvoltage and reverse conduction
elimination.
The synchronous flyback topology yields high
efficiency for minimal heat buildup and “no fan”
operation.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
SDC_IRS Series.A01.D02
Page 1 of 26
IRS Series
Encapsulated Sixteenth-Brick DOSA-Compatible,
Wide Input Isolated DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Root Model
➀
IRS-3.3/15-Q48
IRS-5/10-Q48
IRS-12/4.5-Q48
V
out
I
out
Power
(V) (A, max.) (W)
3.3
5
12
15
➃
10
➄
4.5
➅
49.5
50
54
R/N (mV pk-pk)
Typ.
90
90
115
Max.
125
130
150
Regulation (max.)
➂
Line
±0.15%
±0.125%
±0.125%
Load
±0.3%
±0.125%
±0.125%
V
in
Nom.
(V)
48
48
48
Range
(V)
18-75
18-75
18-75
Input
I
in
, no load
(mA)
25
30
25
I
in
, full
load (A)
1.16
1.14
1.24
Efficiency
Min.
87.5%
88%
89%
Typ.
89%
91%
91%
Package
Case (inches)
1.44 x 1.04 x 0.50
1.44 x 1.04 x 0.50
1.44 x 1.04 x 0.50
➀
Please refer to the Part Number Structure when ordering.
➁
All specifications are at nominal line voltage and full load, +25°C unless otherwise
noted. See detailed specifications. Output capacitors are 1 μF ceramic multilayer in
parallel with 10 μF.
I/O caps are necessary for our test equipment and may not be needed for your
application.
➂
Regulation specifications describe output voltage deviations from a nominal/midpoint
value to either extreme (50% load step).
➃
Iout = 13A max. if Vin < 36V.
➄
Iout=8A max. if Vin <36V.
➅
Iout = 3.5A max. if Vin < 36V.
PART NUMBER STRUCTURE
IR S
-
12
/
4.5
-
Q48 N F
-
C
Industrial-Railway
RoHS-6 Compliant
S = Sixteenth Brick
Baseplate
Blank = Standard Baseplate
F = Flanged Baseplate
See Mechanical Drawings for details
On/Off Control Logic:
N = Negative
P = Positive
Input Voltage Range:
Q48 = 18–75 Volts (48V nominal)
Nominal Output Voltage:
Voltage in Volts (V)
Maximum Rated Output Current
Current in Amps (A )
*Sense is included on the IRS-3.3/15-Q48 and IRS-5/10-Q48.
➀
Special quantity order is required.
➁
Some model number combinations may not be available. See website or contact your local Murata sales representative.
www.murata-ps.com/support
SDC_IRS Series.A01.D02
Page 2 of 26
IRS Series
Encapsulated Sixteenth-Brick DOSA-Compatible,
Wide Input Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, IRS-3.3/15-Q48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Conditions
➀
Full temperature range
Operating or non-operating, 100 mS max.
duration
Input to output tested
None, install external fuse
Power on or off, referred to -Vin
Minimum
0
Typical/Nominal
Maximum
75
100
Units
Vdc
Vdc
Isolation Voltage
2250
Vdc
Input Reverse Polarity
None
Vdc
On/Off Remote Control
0
15
Vdc
Output Power
0
49.5
50
W
Output Current
Current-limited, no damage, short-circuit protected
0
15
15
A
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 or recommended.
INPUT
Operating voltage range
18
48
75
Vdc
Recommended External Fuse
Fast blow
7
A
Start-up threshold
Rising input voltage
16
17
17.9
Vdc
Undervoltage lockout
Falling input voltage
15
16.25
17.50
Vdc
Overvoltage shutdown
Rising input voltage
None
Vdc
Reverse Polarity Protection
None, install external fuse
None
Vdc
Internal Filter Type
LC
Input current
Full Load Conditions
Vin = nominal
1.16
1.19
A
Low Line
Vin = minimum, 13A load
2.63
2.72
A
Inrush Transient
0.4
A2-Sec.
Output in Short Circuit
100
200
mA
No Load Input current
Iout = minimum, unit=ON
25
60
mA
Shut-Down mode Input Current (Off, UV, OT)
5
10
mA
Measured at input with specified filter
15
30
mA, pk-pk
Reflected (back) ripple current
➁
Pre-biased startup
External output voltage < Vset
Monotonic
GENERAL and SAFETY
Vin=48V, full load
87.5
89
%
Efficiency
Vin=24V, full load
88.5
90.5
%
Isolation
Isolation Voltage, Input to Output
2250
Vdc
Isolation Voltage, Input to Baseplate
1500
Vdc
Isolation Voltage, Baseplate to Output
1500
Vdc
Insulation Safety Rating
Basic
Isolation Resistance
100
MΩ
Isolation Capacitance
1300
pF
Certified to UL-60950-1, IEC/EN60950-1, 2nd
Safety
Yes
Edition
Belcore, Telcordia SR-332, Method 1, Class 3,
Calculated MTBF
3.0
Hours x 10
6
ground fixed, Tcase=25°C
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
250
280
310
KHz
Power Up Startup Time
Power On to Vout regulated
30
mS
On/Off Startup Time
Remote ON to Vout regulated
30
mS
50-75-50% load step, settling time to within
Dynamic Load Response
100
200
µSec
1% of Vout
Dynamic Load Peak Deviation
Same as above,
±180
±240
mV
FEATURES and OPTIONS
Remote On/Off Control
➅
"N" suffix
Negative Logic, ON state
ON=Pin grounded or external voltage
-0.1
0.8
Vdc
Negative Logic, OFF state
OFF=Pin open or external voltage
2.5
15
Vdc
Control Current
Open collector/drain, sourcing
1
2
mA
"P" suffix
Positive Logic, ON state
ON=Pin open or external voltage
10
15
Vdc
www.murata-ps.com/support
SDC_IRS Series.A01.D02
Page 3 of 26
IRS Series
Encapsulated Sixteenth-Brick DOSA-Compatible,
Wide Input Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, IRS-3.3/15-Q48 (CONT.)
Positive Logic, OFF state
Control Current
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
Short Circuit Current
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation
➆
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Remote Sense Compensation
18
Maximum Capacitive Load
MECHANICAL
Outline Dimensions
(Please refer to outline drawing)
Outline Dimensions
(Please refer to outline drawing)
Weight
Through Hole Pin Diameter
Through Hole Pin Material
EMI/RFI Shielding
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
RoHS rating
➃
OFF=Ground pin or external voltage
Open collector/drain
Conditions
➀
See Derating
No trim
At 50% load
User-adjustable
Via magnetic feedback
Vin=18V-36V
Vin=36V-75V
98% of Vnom., after warmup
Hiccup technique, autorecovery within 1.25%
of Vout
Output shorted to ground, no damage
Current limiting
Vin=min. to max., Vout=nom., full load
Iout=min. to max., Vin=48V
With a 1uF || 10uF output caps
With a 1uF || 100uF output caps
At all outputs
Sense connected at load
Constant resistance mode , low ESR
Standard Basplate
LxWxH
Flanged Basplate
LxWxH
±0.15
±0.3
125
%
%
mV pk-pk
mV pk-pk
% of Vnom./°C
% of Vout
μF
Inches
mm
Inches
mm
Ounces
Grams
Inches
mm
0
Minimum
0.0
3.267
-10
4
0.0
0.0
18.4
No minimum load
21.9
0.6
Continuous
1
Typical/Nominal
49.5
3.3
1
4.3
0.7
2
Maximum
50
3.333
10
4.9
13.0
15.0
25.4
Vdc
mA
Units
W
Vdc
% of Vnom.
% of Vnom.
Vdc
A
A
A
A
90
60
0.02
0
10,000
1.44 x 1.04 x 0.5
36.47 x 26.31 x 12.7
1.44 x 1.5 x 0.5
36.47 x 38.1 x 12.7
0.58
16.4
0.06 & 0.04
1.524 & 1.016
Copper alloy
None
-40
-40
-55
115
10
See derating, full power, natural convection
No derating, full power, natural convection
Vin = Zero (no power)
Measured in center
External filter is required
125
B
RoHS-6
85
105
125
130
°C
°C
°C
°C
Class
www.murata-ps.com/support
SDC_IRS Series.A01.D02
Page 4 of 26
IRS Series
Encapsulated Sixteenth-Brick DOSA-Compatible,
Wide Input Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, IRS-3.3/15-Q48
Efficiency vs. Line Voltage and Load Current @ 25°C
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