IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
Output Voltage (V)
3.3
5
12
Typical unit
FEATURES
High efficiency synchronous flyback topology
18-75 Volts DC wide input range with 3.3, 5, 12
Volts for a single output voltage
Up to 54 Watts total output power with overtemperature shutdown
Tiny 1.44" x 1.04" x 0.50" baseplate package
Industry standard DOSA "brick" format and pinout
Extensive self-protection shut down features
Small footprint DC-DC converter, ideal for high
current applications
2250 Volt Basic input/output isolation
Operating temperature range -40 to +85°C with
derating
Stable no-load operation with no required external components
Certified to UL 60950-1, 2nd Edition and UL
62368-1 safety approvals
Output Current (A)
15
10
4.5
Input Voltage (V)
18-75
18-75
18-75
Optimized for harsh environments in industrial/railway applications, the IRS DC-DC converter
series offer regulated outputs in an industry-standard sixteenth-brick fully encased package.
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 “sixteenthbrick” width (0.90 inches) while still retaining a
high power output and full 2250 Volt DC isolation.
The converter family accepts 18 to 75 Volts DC
inputs and delivers fixed outputs regulated to
within ±0.125%. The IRS converters are ideal for
industrial and railway applications, 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
Standard Baseplate Option
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.
Flanged Baseplate Option
SAFETY FEATURES
Basic insulation
UL 60950-1, 2nd Edition, UL 62368-1
CAN/CSA-C22.2 NO. 60950-1
RoHS compliant
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
SDC_IRS_Q48_Series.B01.D04 Page 1 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ①②
Root Model ➀
Output
Vout
Iout
Power
(V) (A, max.) (W)
IRS-3.3/15-Q48
3.3
15
49.5
IRS-12/4.5-Q48
12
4.5
54
IRS-5/10-Q48
①
②
5
10
50
R/N (mV pk-pk)
Typ.
Max.
90
130
90
115
125
150
Regulation (max.)
Line
±0.15%
±0.125%
±0.125%
Please refer to the Part Number Structure when ordering.
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 and a 220 μF 100V capacitor across
the input pins. I/O caps are necessary for our test equipment and may not be
needed for your application.
Input
Efficiency
Package ④
Load
Vin Nom.
(V)
Range
(V)
Iin, no load
(mA)
Iin, full
load (A)
±0.3%
±0.125%
48
25
1.16
87.5% 89.0% 1.44 x 1.04 x 0.50
±0.125%
48
18-75
48
18-75
25
1.24
89.0% 91.0% 1.44 x 1.04 x 0.50
③
③
④
18-75
30
1.14
Min.
Typ.
Case (inches)
88.0% 91.0% 1.44 x 1.04 x 0.50
Regulation specifications describe output voltage deviations from a
nominal/midpoint value to either extreme (50% load step).
Please see the Mechanical Drawings for the Flanged Baseplate package and
the Case Dimensions in [mm].
PART NUMBER STRUCTURE
IR S - 12 / 4.5 - Q48
Q48 N F - C
Industrial-Railway
S = Sixteenth Brick
Nominal Output Voltage:
Voltage in Volts (V)
Maximum Rated Output Current
Current in Amps (A)
RoHS Compliant
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)
*Sense is included on the IRS-3.3/15-Q48 and IRS-5/10-Q48.
Part Number Examples:
IRS-3.3/15-Q48NF-C stands for Industrial Railway 1/16 Brick, 3.3Vout@15A, 18V-75Vin, Negative Logic, Flanged Baseplate, RoHS Compliant.
IRS-12/4.5-Q48P-C stands for Industrial Railway 1/16 Brick, 12Vout@4.5A, 18V-75Vin, Positive Logic, Standard Baseplate, RoHS Compliant.
Note: Some model number combinations may not be available. Please see our website or contact your local Murata Sales Representative.
www.murata-ps.com/support
SDC_IRS_Q48_Series.B01.D04 Page 2 of 26
IRS-Q48 Series
FUNCTIONAL SPECIFICATIONS, IRS-3.3/15-Q48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
Conditions [1]
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
Units
100
Vdc
75
Vdc
A
Vdc
Vdc
Vdc
Vdc
75
Vdc
Isolation Voltage
Vdc
2250
Input Reverse Polarity
None
Vdc
On/Off Remote Control
0
15
Vdc
Output Power
0
50
W
Output Current
Current-limited, no damage, short-circuit protected
0
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
Recommended External Fuse
Start-up threshold
Undervoltage lockout [9]
Overvoltage shutdown
Reverse Polarity Protection [11]
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load Input current
Shut-Down mode Input Current (Off, UV, OT)
Reflected (back) ripple current [2]
Pre-biased startup
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage, Input to Output
Isolation Voltage, Input to Baseplate
Isolation Voltage, Baseplate to Output
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF [3]
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Power Up Startup Time
On/Off Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control [4]
"N" suffix
Negative Logic, ON state
Negative Logic, OFF state
Control Current
"P" suffix
Positive Logic, ON state
Positive Logic, OFF state
Control Current
www.murata-ps.com/support
Fast blow
Rising input voltage
Falling input voltage
Rising input voltage
None, install external fuse
18
16
15
Vin = nominal
Vin = minimum, 13A load
Measured at input with specified filter
External output voltage < Vset
87.5
88.5
2250
1500
1500
UL-60950-1, CSA-C22.2 No.60950-1,
2nd Edition, UL 62368-1
Belcore, Telcordia SR-332, Method 1, Class 3,
ground fixed, Tcase=25°C
Power On to Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
1% of Vout
Same as above,
17.9
17.50
1.16
2.63
0.4
100
25
5
15
Monotonic
Iout = minimum, unit=ON
Vin=48V, full load
Vin=24V, full load
48
7
17
16.25
None
None
LC
1.19
2.72
200
60
10
30
89
90.5
A
A
A2-Sec.
mA
mA
mA
mA, pk-pk
%
%
Vdc
Vdc
Vdc
Basic
100
1300
MΩ
pF
Yes
3.0
250
280
100
ON=Pin grounded or external voltage
OFF=Pin open or external voltage
Open collector/drain, sourcing
-0.1
2.5
ON=Pin open or external voltage
OFF=Ground pin or external voltage
Open collector/drain
10
0
Hours x 106
310
30
30
kHz
mS
mS
±180
±240
200
µSec
1
0.8
15
2
Vdc
Vdc
mA
1
15
0.7
2
Vdc
Vdc
mA
mV
SDC_IRS_Q48_Series.B01.D04 Page 3 of 26
IRS-Q48 Series
FUNCTIONAL SPECIFICATIONS, IRS-3.3/15-Q48 (CONT.)
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range [6]
Overvoltage Protection [8]
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 [5]
Line Regulation
Load Regulation
Ripple and Noise [7][10]
Temperature Coefficient
Remote Sense Compensation [12]
Maximum Capacitive Load
MECHANICAL
Outline Dimensions
(Please refer to outline drawing)
Outline Dimensions
(Please refer to outline drawing)
Weight
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
Conditions [1]
Minimum
Typical/Nominal
Maximum
Units
No trim
At 50% load
User-adjustable
Via magnetic feedback
3.267
3.3
1
3.333
10
4.9
Vdc
% of Vnom.
% of Vnom.
Vdc
Vin=18V-36V
Vin=36V-75V
0.0
0.0
13.0
15.0
A
A
98% of Vnom., after warmup
18.4
25.4
A
See Derating
0.0
-10
4
www.murata-ps.com/support
No minimum load
21.9
0.6
Output shorted to ground, no damage
Continuous
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
0
Standard Baseplate
LxWxH
Flanged Baseplate
LxWxH
See derating, full power, natural convection
No derating, full power, natural convection
Vin = Zero (no power)
Measured in center
External filter is required
50
±0.15
±0.3
125
10
10,000
1.44 x 1.04 x 0.50
36.5 x 26.3 x 12.7
1.44 x 1.50 x 0.5
36.5 x 38.1 x 12.7
0.903
25.6
0.06±0.002 & 0.04±0.002
1.52±0.05 & 1.02±0.05
Copper alloy
None
-40
-40
-55
115
125
A
RoHS
W
A
90
60
0.02
Through Hole Pin Material
EMI/RFI Shielding
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
RoHS rating [4]
4.3
Hiccup technique, autorecovery within 1.25%
of Vout
Through Hole Pin Diameter
ENVIRONMENTAL
49.5
%
%
mV pk-pk
mV pk-pk
% of Vnom./°C
% of Vout
μF
Inches
mm
Inches
mm
Ounces
Grams
Inches
mm
85
105
125
130
°C
°C
°C
°C
Class
SDC_IRS_Q48_Series.B01.D04 Page 4 of 26
IRS-Q48 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
Power Dissipation vs. Load Current @ 25°C
6.5
92
91
90
89
88
87
86
85
84
83
6.0
5.5
5.0
4.5
Power Dissipation (W)
Efficiency (%)
Vin = 75V
Vin = 36V
4.0
Vin = 24V
82
81
80
79
78
77
76
75
0.8
3.5
Vin = 18V
3.0
2.5
Vin = 75V
2.0
Vin = 48V
1.5
Vin = 24V
Vin = 18V
1.0
1.8
2.8
3.8
4.8
5.9
6.9
7.9
8.9
Load Current (A)
9.9
10.9
12.0
13.0
14.0
15.0
0.5
0.8
16
15
14
13
12
11
10
9
8
Output Load Current (Amps)
Output Load Current (Amps)
8
7
6
5
4
3
2
1
0
600LFM
500LFM
400LFM
300LFM
200LFM
100LFM
40
45
50
55
60
65
70
Ambient Temperature in Degrees Celsius
75
2.8
80
4
3
2
1
0
85
40
Output Load Current (Amps)
Output Load Current (Amps)
50
55
60
65
70
Ambient Temperature in Degrees Celsius
www.murata-ps.com/support
75
6.9
7.9
Load Current (A)
8.9
9.9
10.9
12.0
13.0
14.0
15.0
300LFM
200LFM
100LFM
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
100LFM
45
5.9
45
50
55
60
65
70
Ambient Temperature in Degrees Celsius
75
80
85
80
85
Maximum Current Temperature Derating at Sea Level
(Vin = 75V, airflow is from Vin- to Vin+)
600LFM
500LFM
400LFM
300LFM
200LFM
40
4.8
600LFM
500LFM
400LFM
7
6
5
Maximum Current Temperature Derating at Sea Level
(Vin = 60V, airflow is from Vin- to Vin+)
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
3.8
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin- to Vin+)
Maximum Current Temperature Derating at Sea Level
(Vin = 24V, airflow is from Vin- to Vin+)
16
15
14
13
12
11
10
9
1.8
80
85
1
0
600LFM
500LFM
400LFM
300LFM
200LFM
100LFM
40
45
50
55
60
65
70
Ambient Temperature in Degrees Celsius
75
SDC_IRS_Q48_Series.B01.D04 Page 5 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, IRS-3.3/15-Q48
Output Ripple and Noise (Vin=48V, Vout=nom., Iout=no load,
Cload=1µF ceramic || 10µF tantalum, Ta=+25°C., Scope BW=20MHz)
Output Ripple and Noise (Vin=48V, Vout=nom., Iout=15A,
Cload=1µF ceramic || 10µF tantalum, Ta=+25°C., Scope BW=20MHz)
On/Off Enable Delay (Vin=48V, Vout=nom., Iout=15A, Cload=0 µF, Ta=+25°C.,
Scope BW=20MHz) Trace 1=Enable, Trace 4=Vout
Step Load Transient Response (Vin=48V, Vout=nom., Iout=50-75-50% of full load,
Cload=1µF ceramic || 10µF tantalum, Ta=+25°C., Scope BW=20MHz)
Step Load Transient Response (Vin=48V, Vout=nom., Iout=50-75-50% of full load,
Cload=10,000 µF, Ta=+25°C., Scope BW=20MHz)
Thermal Derating vs. Baseplate Temperature
120
Output Current ( % of Nominal)
100
80
60
40
20
0
40
45
50
55
60
65
70
75
80
85
90
95
100
105
Baseplate Temperature in Degrees Celsius
www.murata-ps.com/support
www.murata-ps.com/support
SDC_IRS_Q48_Series.B01.D04 Page 6 of 26
IRS-Q48 Series
FUNCTIONAL SPECIFICATIONS, IRS-5/10-Q48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
Conditions [1]
Full temperature range
Operating or non-operating, tested:
100 mS max. duration
Input to output
None, install external fuse
Power on, referred to -Vin
Minimum
0
Typical/Nominal
0
Maximum
Units
100
Vdc
75
5
17.9
17.5
Vdc
A
Vdc
Vdc
Vdc
Vdc
1.2
2.51
A
A
A2-Sec.
mA
mA
mA
mAp-p
mAp-p
75
Vdc
Isolation Voltage
2250
Vdc
Input Reverse Polarity
None
Vdc
On/Off Remote Control
0
15
Vdc
Output Power
0
50.63
W
Output Current
Current-limited, no damage, short-circuit protected
0
10
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
Recommended External Fuse
Start-up threshold, turn on
Undervoltage shutdown, turn off [9]
Overvoltage shutdown
Reverse Polarity Protection [11]
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load Input Current
Shut-Down Mode Input Current
Reflected (back) ripple current [2]
Reflected (back) ripple current [2]
Pre-biased startup
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage, Input to Output
Isolation Voltage, Input to Baseplate
Isolation Voltage, Baseplate to Output
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety (meets the following requirements)
Calculated MTBF [3]
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control [4]
"N" suffix
Negative Logic, ON state
Negative Logic, OFF state
Control Current
"P" suffix
Positive Logic, ON state
Positive Logic, OFF state
Control Current
www.murata-ps.com/support
Fast blow
Rising input voltage
Falling input voltage
18
48
16
15
17.5
16.75
NA
None
LC
None, install external fuse
Vin = nominal
Vin = minimum
1.14
2.44
0.4
100
30
5
150
15
Monotonic
Iout = minimum, unit=ON
No filtering
Measured at input with specified filter
External output voltage < Vset
Vin=48V, full load
Vin=24V, full load
88
89.5
2250
1500
1500
UL-60950-1, CSA-C22.2 No.60950-1,
2nd Edition, UL 62368-1
Belcore, Telcordia SR-332, Method 1, class 3,
ground fixed, Tambient=25°C
Power On to Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
1% of Vout
Same as above,
200
60
10
200
30
91
91
%
%
Vdc
Vdc
Vdc
Basic
100
1000
MΩ
pF
Yes
3.0
225
275
100
ON = Pin grounded or external voltage
OFF = Pin open or external voltage
open collector/drain
-0.1
2.5
ON = Pin open or external voltage
OFF = Ground pin or external voltage
open collector/drain
10
0
Hours x 106
325
30
30
kHz
mS
mS
±180
±240
200
µSec
1
0.8
15
2
V
V
mA
1
15
0.7
2
V
V
mA
mV
SDC_IRS_Q48_Series.B01.D04 Page 7 of 26
IRS-Q48 Series
FUNCTIONAL SPECIFICATIONS, IRS-5/10-Q48 (CONT.)
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range [6]
Overvoltage Protection [8]
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 [5]
Line Regulation
Load Regulation
Ripple and Noise [7][10]
Temperature Coefficient
Remote Sense Compensation [12]
Maximum Capacitive Loading (10% ceramic,
90% Oscon)
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
Conditions [1]
Minimum
Typical/Nominal
Maximum
Units
No trim
At 50% load
User-adjustable
Via magnetic feedback
4.938
-1.25
-20
6.2
5
5.063
1.25
10
6.6
Vdc
% of Vset
Vin=18V to 36V
Vin=36V to 75V
0
0
98% of Vnom., cold condition
12
See Derating
0.0
50
6.4
No minimum load
14
Hiccup technique, autorecovery within
1.25% of Vout
0.6
Output shorted to ground, no damage
Continuous
Vin=min. to max., Vout=nom., nom load
Iout=min. to max
With a 1uF || 10 uF output caps.
With a 1uF || 100uF tantalum output caps
At all outputs
Sense connected at load
±0.125
±0.125
90
65
0.02
Current limiting
MECHANICAL
Outline Dimensions
(Please refer to outline drawing)
Outline Dimensions
(Please refer to outline drawing)
Weight
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
EMI/RFI Shielding
ENVIRONMENTAL
Operating Ambient Temperature Range
Storage Temperature
Operating Case Temp
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
RoHS rating [4]
www.murata-ps.com/support
Constant resistance mode, low ESR
Standard Baseplate
LxWxH
Flanged Baseplate
LxWxH
Diameter of pins standard
Nickel subplate
Gold overplate
See derating curves
Vin = Zero (no power)
No derating required
Measured at hotspot
External filter is required
0
50.63
W
Vdc
8
10
A
16.5
A
A
130
10
V
V
mV pk-pk
mV pk-pk
% of Vout./°C
% of Vout
5000
μF
1.44 x 1.04 x 0.50
36.5 x 26.3 x 12.7
1.44 x 1.50 x 0.5
36.5 x 38.1 x 12.7
0.903
25.6
0.06±0.002 & 0.04±0.002
1.52±0.05 & 1.02±0.05
Gold-plated copper alloy with nickel underplate
50
5
None
Inches
mm
Inches
mm
Ounces
Grams
Inches
mm
-40
-55
-40
115
125
A
RoHS
85
125
105
130
µ-inches
µ-inches
°C
°C
°C
°C
Class
SDC_IRS_Q48_Series.B01.D04 Page 8 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, IRS-5/10-Q48
Efficiency vs. Line Voltage and Load Current @ 25°C – Vin = 36V-75V
Efficiency (%)
Efficiency (%)
Efficiency vs. Line Voltage and Load Current @ 25°C – Vin = 18V-36V
Output Load Current (Amps)
Output Load Current (Amps)
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin- to Vin+)
Output Load Current (Amps)
Output Load Current (Amps)
Maximum Current Temperature Derating at Sea Level
(Vin = 24V, airflow is from Vin- to Vin+)
Ambient Temperature in Degrees Celsius
Ambient Temperature in Degrees Celsius
Maximum Current Temperature Derating at Sea Level
(Vin = 75V, airflow is from Vin- to Vin+)
Output Load Current (Amps)
Output Load Current (Amps)
Maximum Current Temperature Derating at Sea Level
(Vin = 60V, airflow is from Vin- to Vin+)
Ambient Temperature in Degrees Celsius
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Ambient Temperature in Degrees Celsius
SDC_IRS_Q48_Series.B01.D04 Page 9 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, IRS-5/10-Q48
Power On Startup Delay (Vin=0 to 48V, Vout=nom, Iout=10A, Cload=0 uF, Ta=+25°C.,
Scope BW=20MHz) Trace 1=Vin, Trace 4=Vout
Power On Startup Delay (Vin=0 to 48V, Vout=nom, Iout=0A, Cload=0 uF, Ta=+25°C.,
Scope BW=20MHz) Trace 1=Vin, Trace 4=Vout
On/Off Enable Delay (Vin=48V, Vout=nom, Iout=10A, Cload=0 uF, Ta=+25°C., Scope BW=20MHz) Trace 1=Enable, Trace 4=Vout
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SDC_IRS_Q48_Series.B01.D04 Page 10 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, IRS-5/10-Q48
Output Ripple and Noise (Vin=48V, Vout=nom., Iout=10A, Cload=1 uF ceramic ||
10uf tantalum, Ta=+25°C., Scope BW=20MHz)
Output Ripple and Noise (Vin=48V, Vout=nom., Iout=0A, Cload=1 uF ceramic || 10uf
tantalum, Ta=+25°C., Scope BW=20MHz)
Step Load Transient Response (Vin=48V, Vout=nom., Iout=50-75-50% of full load, Cload=1
uF ceramic || 10uF tantalum, Ta=+25°C., ScopeBW=20MHz Ch1=5Vo, Ch2=Io 2amps\div)
Step Load Transient Response (Vin=48V, Vout=nom., Iout=50-75-50% of full load,
Cload=680uF, Ta=+25°C., Scope BW=20MHz Ch1=5Vo, Ch2=Io 2amps\div)
Thermal Derating vs. Baseplate Temperature
120
Output Current ( % of Nominal)
100
80
60
40
20
0
40
45
50
55
60
65
70
75
80
85
90
95
100
105
Baseplate Temperature in Degrees Celsius
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SDC_IRS_Q48_Series.B01.D04 Page 11 of 26
IRS-Q48 Series
FUNCTIONAL SPECIFICATIONS, IRS-12/4.5-Q48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
Conditions [1]
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
Input Voltage, Transient
Minimum
0
Typical/Nominal
0
Maximum
Units
100
Vdc
75
Vdc
A
Vdc
Vdc
Vdc
Vdc
75
Vdc
Isolation Voltage
2250
Vdc
Input Reverse Polarity
None
Vdc
On/Off Remote Control
0
15
Vdc
Output Power
0
54.54
W
Output Current
Current-limited, no damage, short-circuit protected
0
4.5
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
Recommended External Fuse
Start-up threshold
Undervoltage lockout [9]
Overvoltage shutdown
Reverse Polarity Protection [11]
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load Input Current
Shut-Down Mode Input Current (Off, UV, OT)
Reflected (back) ripple current [2]
Pre-biased startup
Fast blow
Rising input voltage
Falling input voltage
Rising input voltage
None, install external fuse
Measured at input with specified filter
External output voltage < Vset
Vin=48V, full load
Vin=24V, full load
DYNAMIC CHARACTERISTICS
89
89.5
2250
1500
1500
UL-60950-1, CSA-C22.2 No.60950-1,
2nd Edition, UL 62368-1
Per Telcordia SR-332, Method 1, class 3, ground
fixed, Tambient=25°C
Fixed Switching Frequency
Power Up Startup Time
On/Off Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control [4]
"N" suffix
Negative Logic, ON state
Negative Logic, OFF state
Control Current
"P" suffix
Positive Logic, ON state
Positive Logic, OFF state
Control Current
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Power On to Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
±1% of Vout
Same as above,
48
6
17.2
16.5
None
None
Capacitive
1.24
2.55
0.05
100
25
5
30
Monotonic
Iout = minimum, unit=ON
Efficiency
Calculated MTBF [3]
16.5
15
Vin = nominal
Vin = minimum, 3.5A load
GENERAL and SAFETY
Isolation
Isolation Voltage, Input to Output
Isolation Voltage, Input to Baseplate
Isolation Voltage, Baseplate to Output
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety (Designed to meet the following requirements)
18
17.9
17.50
1.28
2.63
200
60
10
40
91
91.5
A
A
A2-Sec.
mA
mA
mA
mA, pk-pk
%
%
Vdc
Vdc
Vdc
Basic
100
1000
MΩ
pF
Yes
3.0
200
230
250
ON=Pin grounded or external voltage
OFF=Pin open or external voltage
Open collector/drain, sourcing
-0.1
2.5
ON=Pin open or external voltage
OFF=Pin grounded or external voltage
Open collector/drain, sinking
10
0
Hours x 106
260
30
30
kHz
mS
mS
±350
±400
300
µSec
1
0.8
15
2
Vdc
Vdc
mA
1
15
0.7
2
Vdc
Vdc
mA
mV
SDC_IRS_Q48_Series.B01.D04 Page 12 of 26
IRS-Q48 Series
FUNCTIONAL SPECIFICATIONS, IRS-12/4.5-Q48 (CONT.)
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range [6]
Overvoltage Protection [8]
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 [5]
Line Regulation
Load Regulation
Ripple and Noise [7][10]
Temperature Coefficient
Maximum Capacitive Load
MECHANICAL
Outline Dimensions
(Please refer to outline drawing)
Outline Dimensions
(Please refer to outline drawing)
Weight
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
Conditions [1]
Minimum
Typical/Nominal
Maximum
Units
No trim
At 50% load
User-adjustable
Via magnetic feedback
11.88
12
±1
12.12
10
18
Vdc
% of Vnom.
% of Vnom.
Vdc
Vin=18V-36V
Vin=36V-75V
0
0
3.5
4.5
A
A
98% of Vnom., after warmup
5.05
7.4
A
See Derating
0
-20
13.3
EMI/RFI Shielding
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
RoHS rating [4]
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15.3
No minimum load
6.4
Hiccup technique, autorecovery within ±1.25%
of Vout
0.6
Output shorted to ground, no damage
Continuous
Current limiting
Vin=min. to max., Vout=nom., full load
Iout=min. to max., Vin=48V
with a 1uF || 10uF output caps
At all outputs
Constant resistance mode, low ESR
0
Standard Baseplate
LxWxH
Flanged Baseplate
LxWxH
Nickel subplate
Gold overplate
No derating, full power, natural convection
No derating, full power, natural convection
Vin = Zero (no power)
Measured in center
External filter is required
54.54
-40
-40
-55
115
±0.125
±0.125
150
115
±0.02
2200
125
A
RoHS
W
A
1.44 x 1.04 x 0.50
36.5 x 26.3 x 12.7
1.44 x 1.50 x 0.5
36.5 x 38.1 x 12.7
0.903
25.6
0.06±0.002 & 0.04±0.002
1.52±0.05 & 1.02±0.05
Copper alloy
50
5
None
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
54
%
%
mV pk-pk
% of Vnom./°C
μF
Inches
mm
Inches
mm
Ounces
Grams
Inches
mm
µ-inches
µ-inches
85
105
125
130
°C
°C
°C
°C
Class
SDC_IRS_Q48_Series.B01.D04 Page 13 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, IRS-12/4.5-Q48
Power Dissipation vs. Load Current @ 25°C
Efficiency (%)
Power Dissipation (W)
Efficiency vs. Line Voltage and Load Current @ 25°C
Output Load Current (Amps)
Output Load Current (Amps)
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin- to Vin+)
Output Load Current (Amps)
Output Load Current (Amps)
Maximum Current Temperature Derating at Sea Level
(Vin = 24V, airflow is from Vin- to Vin+)
Ambient Temperature in Degrees Celsius
Maximum Current Temperature Derating at Sea Level
(Vin = 60V, airflow is from Vin- to Vin+)
Maximum Current Temperature Derating at Sea Level
(Vin = 75V, airflow is from Vin- to Vin+)
Output Load Current (Amps)
Output Load Current (Amps)
Ambient Temperature in Degrees Celsius
Ambient Temperature in Degrees Celsius
Ambient Temperature in Degrees Celsius
TYPICAL PERFORMANCE DATA, IRS-12/4.5-Q48
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SDC_IRS_Q48_Series.B01.D04 Page 14 of 26
IRS-Q48 Series
TYPICAL PERFORMANCE DATA, IRS-12/4.5-Q48
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
Output Ripple and Noise (Vin=48V, Vout=nom., Iout=no load,
Cload=1µF ceramic || 10µF tantalum, Ta=+25°C., Scope BW=20MHz)
Output Ripple and Noise (Vin=48V, Vout=nom., Iout=4.5A,
Cload=1µF ceramic || 10µF tantalum, Ta=+25°C., Scope BW=20MHz)
On/Off Enable Delay (Vin=48V, Vout=nom., Iout=no load, Cload=0 µF, Ta=+25°C.,
Scope BW=20MHz) Trace 1=Enable, Trace 4=Vout
On/Off Enable Delay (Vin=48V, Vout=nom., Iout=4.5A, Cload=0 µF, Ta=+25°C.,
Scope BW=20MHz) Trace 1=Enable, Trace 4=Vout
Step Load Transient Response (Vin=48V, Vout=nom., Iout=50-75-50% of full load,
Cload=1µF ceramic || 10µF tantalum, Ta=+25°C., Scope BW=20MHz)
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SDC_IRS_Q48_Series.B01.D04 Page 15 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, IRS-12/4.5-Q48
Power On Startup Delay (Vin=0 to 48V, Vout=nom., Iout=no load, Cload=0 µF, Ta=+25°C.,
Scope BW=20MHz) Trace 1=Vin, Trace 4=Vout
Power On Startup Delay (Vin=0 to 48V, Vout=nom., Iout=4.5A, Cload=0 µF, Ta=+25°C.,
Scope BW=20MHz) Trace 1=Vin, Trace 4=Vout
Thermal Derating vs. Baseplate Temperature
120
Output Current ( % of Nominal)
100
80
60
40
20
0
40
45
50
55
60
65
70
75
80
85
90
95
100
105
Baseplate Temperature in Degrees Celsius
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SDC_IRS_Q48_Series.B01.D04 Page 16 of 26
IRS-Q48 Series
Performance Specification Notes
1. All specifications are typical unless noted. Ambient temperature =
+25°Celsius, Vin is nominal, output current is maximum rated nominal.
External output capacitance is 1 µF multilayer ceramic paralleled with
10 µF electrolytic. All caps are low ESR. These capacitors are necessary for
our test equipment and may not be needed in your application.
Testing must be kept short enough that the converter does not appreciably
heat up during testing. For extended testing, use plenty of airflow. See
Derating Curves for temperature performance. All models are stable and
regulate within spec without external capacitance.
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
6. Do not exceed maximum power ratings or output overvoltage when adjusting output trim values.
7. At zero output current, Vout may contain components which slightly
exceed the ripple and noise specifications.
8. Output overload protection is non-latching. When the output overload
is removed, the output will automatically recover.
9. The converter will shut off if the input falls below the undervoltage threshold. It will not restart until the input exceeds the Input Start Up Voltage.
2. Input Ripple Current is tested and specified over a 5-20 MHz bandwidth
and uses a special set of external filters only for the Ripple Current specifications. Input filtering is Cin = 33 µF, Cbus = 220 µF, Lbus = 12 µH. Use
capacitor rated voltages which are twice the maximum expected voltage.
Capacitors must accept high speed AC switching currents.
10. Output noise may be further reduced by installing an external filter. See
the Application Notes. Use only as much output filtering as needed and no
more. Larger caps (especially low-ESR ceramic types) may slow transient
response or degrade dynamic performance. Thoroughly test your application with all components installed.
4. The On/Off Control is normally driven from a switch or relay. An open
collector/open drain transistor may be used in saturation and cut-off
(pinch-off) modes. External logic may also be used if voltage levels are
fully compliant to the specifications.
12. If remote sense is not used, connect it to its respective Vout terminal.
Sense is included on IRS-3.3/15-Q48 and IRS-5/10-Q48 models only.
3. Mean Time Before Failure (MTBF) is calculated using the Telcordia
(Belcore) SR-332 Method 1, Case 3, Issue 1, ground fixed conditions. Operating temperature = +30°C, full output load, natural air convection.
11. If reverse polarity is accidentally applied to the input, to ensure reverse
input protection with full output load, always connect an external fast blow
input fuse in series with the +Vin input.
5. Regulation specifications describe the deviation as the input line voltage
or output load current is varied from a nominal midpoint value to either
extreme (50% load).
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SDC_IRS_Q48_Series.B01.D04 Page 17 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
STANDARDS COMPLIANCE
Parameter
Notes
UL 62368-1, 2nd Ed, 2014-12-01
UL 60950-1/R:2011-12
CAN/CSA-C22.2 No. 60950-1/A1:2011
IEC 61000-4-2
ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance)
Note: An external input fuse must always be used to meet these safety requirements.
ENVIRONMENTAL QUALIFICATION TESTING
Parameter
#Units
Test Conditions
Vibration
15
EN 61373:1999 Category I, Class B, Body mounted
Mechanical Shock
15
EN 61373:1999 Category I, Class B, Body mounted
DMTBF (Life Test)
60
Vin nom, units at derating point,101days
Temperature Cycling Test (TCT)
15
-40 °C to 125 °C, unit temp. ramp 15 °C/min.,500cycles
Power and Temperature Cycling Test
(PTCT)
5
Temperature operating = min to max, Vin = min to max, Load=50% of rated maximum,100cycles
Temperature, Humidity and Bias (THB)
15
85 °C85RH, Vin=max, Load=min load,1072Hour (72hours with a pre-conditioning soak, unpowered)
Damp heat test, cyclic
15
EN60068-2-30: Temperatures: + 55 °C and + 25 °C; Number of cycles: 2 (respiration effect);
Time: 2 x 24 hours; Relative Humidity: 95%
Dry heat test
5
EN60068-2-2, Vin=nom line, Full load, 85°C for 6 hours.
High Temperature Operating Bias (HTOB)
15
Vin=min to max ,95% rated load, units at derating point,500hours
Low Temperature operating
5
Vin=nom line, Full load,-40°C for 2 hours.
Highly Accelerated Life Test (HALT)
5
High temperature limits, low temperature limits, Vibration limits, Combined Environmental Tests.
EMI
3
Class A in CISSPR 22 or IEC62236-3-2(GB/T 24338.4)
ESD
3
IEC 6100-4-2: +/-8kv contact discharge /+/-15kv air discharge
Surge Protection
3
EN50121-3-2
Note: Governing Standard BS EN 50155:2007 Railway applications - Electronics equipment used on rolling stock.
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SDC_IRS_Q48_Series.B01.D04 Page 18 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
MECHANICAL SPECIFICATIONS (STANDARD BASEPLATE OPTION)
Notes:
DIMENSIONS ARE IN INCHES [mm]
[ 36.5 ]
1.44
[ 26.3 ]
1.04
TOP VIEW
[ 1.5 ]
4x R.06
.010 [ 0.25 ]
[ 3.8±0.02 ]
0.15
SIDE VIEW
[ 12.7 ]
0.50
[ 0.38 ]
0.015
0.040±0.002 @
PINS 1-3, 5-7
[ 7.62 ]
0.300
BOTTOM VIEW
PIN
#1
22.5
0.88
REF
[ 7.62 ]
0.300
1
[ 13.97 ]
0.550
ISOMETRIC VIEW
PIN
#8
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ANGLES: ±1°
[2] COMPONENTS SHOWN ARE FOR REFERENCE ONLY
MATERIAL:
.040 PINS: COPPER ALLOY
.060 PINS: COPPER ALLOY
[3] FINISH: (ALL PINS)
GOLD (5u"MIN) OVER NICKEL (50u" MIN)
0.060±.0002 @
PINS 4 & 8
4
5
6
7
8
3
2
[1] TOLERANCES:
2 PLACE±.02
3 PLACE ±.010
[ 3.81 ]
0.150
CL
[ 3.81 ]
0.150
[ 27.94 ]
1.100
INPUT/OUTPUT CONNECTIONS
Pin Number
Function
1
+Vin
2
Rem On/Off
3
-Vin
4
-Vout
5
-Sense*
6
Trim
7
+Sense*
8
+Vout
* SENSE PINS USED ON THE 3.3Vout and 5Vout
MODELS ONLY.
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 ± 1˚
Components are shown for reference only
and may vary between units.
SDC_IRS_Q48_Series.B01.D04 Page 19 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
MECHANICAL SPECIFICATIONS (FLANGED BASEPLATE OPTION)
[ 36.5 ]
1.44
[ 28.4 ]
1.12
[ 3.3 ]
4x 0.13
[ 4.1 ]
0.16
[ 2.1 ]
0.08 x 45°
1 PLACE
TOP VIEW
[ 9.0 ]
0.35
BOTTOM VIEW
PIN
#1
[ 7.62 ]
0.300
ISOMETRIC VIEW
PIN
#8
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[ 1.78 ]
4x R.070
[ 18.54 ]
0.730
[ 12.7 ]
0.50
[ 36.6 ]
1.44
[ 22.5 ]
0.88
REF
[ 1.02±0.05 ]
0.040±0.002 @
PINS 1-3, 5-7
[ 7.62 ]
0.300
Notes:
[ 33.02 ][ 38.1 ]
1.300 1.50
.010 [0.25]
[ 3.8 ±0.02]
0.15
[ 0.38 ]
0.015
CLEARANCE
SIDE VIEW
[ 1.57 ]
4x R.062
DIMENSIONS ARE IN INCHES [mm]
[ 26.4 ]
1.04
FULL RADIUS x4
[ 1.78 ]
3x R.070
CL
2
1
[ 13.97 ]
0.550
ANGLES: ±1°
[2] COMPONENTS SHOWN ARE FOR REFERENCE ONLY
MATERIAL:
.040 PINS: COPPER ALLOY
.060 PINS: COPPER ALLOY
[3] FINISH: (ALL PINS)
GOLD (5u"MIN) OVER NICKEL (50u" MIN)
[ 8.9 ]
[ 1.52±0.05 ] 0.35 MAX
0.060±0.002 @
PINS 4 & 8 COMP HEIGHT
UNDER BP FLANGES
4
5
6
7
8
3
[1] TOLERANCES:
2 PLACE±.02
3 PLACE ±.010
[ 3.81 ]
0.150
CL
[ 3.81 ]
0.150
[ 27.94 ]
1.100
INPUT/OUTPUT CONNECTIONS
Pin Number
Function
1
+Vin
2
Rem On/Off
3
-Vin
4
-Vout
5
-Sense*
6
Trim
7
+Sense*
8
+Vout
* SENSE PINS USED ON THE 3.3Vout and 5Vout
MODELS ONLY.
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 ± 1˚
Components are shown for reference only
and may vary between units.
SDC_IRS_Q48_Series.B01.D04 Page 20 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
RECOMMENDED FOOTPRINT (STANDARD BASEPLATE CONVERTER)
FINISHED HOLE SIZES
@ PINS 1-3, 6, 5*, 7*
(PER IPC-D-275, LEVEL C)
.048-.062
[ 26.8 ]
1.06
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
TOP VIEW
(PRI)
[ 13.4 ]
.53
REF
CL
(SEC)
1.100
1
2
6
5*
3
4
[ 14.0 ]
.55 C
L
[ 37.0 ]
1.46
.100 MIN
ANNULAR RING
FOR ALL PIN
SHOULDERS
[ 3.81 ]
.150
8
7*
[ 3.81 ]
.55
[ 7.62 ]
[ 7.62 ]
.300
.300 C
L
FINISHED HOLE SIZES
@ PINS 4 & 8
(PER IPC-D-275, LEVEL C)
.070-.084
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
Components are shown for reference only
and may vary between units.
INPUT/OUTPUT CONNECTIONS
Pin Number
Function
1
+Vin
2
Rem On/Off
3
-Vin
4
-Vout
5
-Sense*
6
Trim
7
+Sense*
8
+Vout
* SENSE PINS USED ON THE 3.3Vout and 5Vout
MODELS ONLY.
RECOMMENDED FOOTPRINT (FLANGED BASEPLATE CONVERTER)
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
TOP VIEW
CL
[ 38.61 ]
[ 26.92 ]
1.520
1.060
8
7*
6
5*
4
1
2
3
[ 28.96 ]
1.140
[ 37.08 ]
1.460
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FOOTPRINT IS SAME AS
STANDARD WITH
ADDITIONAL
CL COMPONENT
CLEARANCE FOR
FLANGED BASEPLATE
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
Components are shown for reference only
and may vary between units.
INPUT/OUTPUT CONNECTIONS
Pin Number
Function
1
+Vin
2
Rem On/Off
3
-Vin
4
-Vout
5
-Sense*
6
Trim
7
+Sense*
8
+Vout
* SENSE PINS USED ON THE 3.3Vout and 5Vout
MODELS ONLY.
SDC_IRS_Q48_Series.B01.D04 Page 21 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT
Input end of converters
(all 0.04’’ pins)
Output end of converters
(0.06’’ pins with or without additional 0.04’’ pins)
Label, Paper
Front flap shall be sealed with
ESD tape specified or equivalent
after the box is closed
Label, Paper
2.75±.25
Anti-static foam
48 units per carton
Each tray is 4x6 units
(24 units total per tray)
11.00±.25
10.50±.25
CLOSED CARTON
SHIPPING TRAY DIMENSIONS
Dimensions are in millimeters.
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.5
.XXX ± 0.25
Angles ± 2˚
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SDC_IRS_Q48_Series.B01.D04 Page 22 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For Murata Power Solutions IRS series DC-DC converters, we
recommend the use of a fast blow fuse, installed in the ungrounded input supply
line with a typical value about twice the maximum input current, calculated at
low line with the converter’s minimum efficiency.
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the converters
must be installed in compliance with the requirements of the end use safety
standard, i.e. IEC/UL60950-1.
Input Reverse-Polarity Protection
If the input voltage polarity is accidentally 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, devices will not begin to regulate properly
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage.
Once operating, devices will not turn off until the input voltage drops below the
Under-Voltage Shutdown limit. Subsequent re-start will not occur until the input
is brought back up to the Start-Up Threshold. This built in hysteresis prevents
any unstable on/off situations from occurring at a single input voltage.
Start-Up Time
The VIN to VOUT Start-Up Time is the time interval between the point at which
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specified accuracy band.
Actual measured times will vary with input source impedance, external
input capacitance, and the slew rate and final value of the input voltage as it
appears at the converter. The IRS Series implements a soft start circuit to limit
the duty cycle of its PWM controller at power up, thereby limiting the input
inrush current.
The On/Off Control to VOUT start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin. The
specification defines the interval between the point at which the converter is
turned on (released) and the fully loaded output voltage enters and remains
within its specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off
Control to VOUT start-up time is also governed by the internal soft start circuitry
and external load capacitance. The difference in start up time from VIN to VOUT
and from On/Off Control to VOUT is therefore insignificant.
Input Source Impedance
The input of IRS converters must be driven from a low ac-impedance source.
The DC-DC’s performance and stability can be compromised by the use of
highly inductive source impedances. The input circuit shown in Figure 2 is a
practical solution that can be used to minimize the effects of inductance in the
input traces. For optimum performance, components should be mounted close
to the DC-DC converter.
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Transient and Surge Protection
The input range of the IRS-Q48 modules cover EN50155 requirements for
Brownout and Transient conditions with Nominal input voltages of 37.5V
&48Vdc.
EN50155 standard
Nominal Input
37.5V
48V
Permanent input range
(0.7 - 1.25 Vin)
26 - 47V
33.6 - 60V
Brownout 100ms
(0.6 x Vin)
22.5V
28.8V
Transient 1s
(1.4 x Vin)
52.5V
67.2V
I/O Filtering, Input Ripple Current, and Output Noise
All models in the IRS Series are tested/specified for input reflected ripple current and output noise using the specified external input/output components/
circuits and layout as shown in the following two figures. External input capacitors (CIN in Figure 2) serve primarily as energy-storage elements, minimizing line voltage variations caused by transient IR drops in conductors from
backplane to the DC-DC. Input caps should be selected for bulk capacitance
(at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The
switching nature of DC-DC converters requires that dc voltage sources have
low ac impedance as highly inductive source impedance can affect system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your specific
system configuration may necessitate additional considerations.
In critical applications, output ripple/noise (also referred to as periodic and
TO
OSCILLOSCOPE
+INPUT
LBUS
+
VIN
CBUS
–
CIN
CURRENT
PROBE
COMMON
CIN = 500µF, ESR < 700m @ 100kHz
CBUS = 220µF, ESR < 100m @ 100kHz
LBUS = 12µH
Figure 2. Measuring Input Ripple Current
random deviations or PARD) may be reduced below specified limits using filtering
techniques, the simplest of which is the installation of additional external output
capacitors. They function as true filter elements and should be selected for bulk
capacitance, low ESR and appropriate frequency response.
All external capacitors should have appropriate voltage ratings and be
located as close to the converter as possible. Temperature variations for all
relevant parameters should also be taken carefully into consideration. The most
effective combination of external I/O capacitors will be a function of line voltage
and source impedance, as well as particular load and layout conditions.
Floating Outputs
Since these are isolated DC-DC converters, their outputs are “floating” with
respect to their input. Designers will normally use the –Output as the ground/
return of the load circuit. You can however, use the +Output as ground/return to
effectively reverse the output polarity.
SDC_IRS_Q48_Series.B01.D04 Page 23 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
+SENSE
+VOUT
C1
C2
SCOPE
RLOAD
–VOUT
–SENSE
C1 = 1µF
C2 = 10µF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple/Noise (PARD)
Minimum Output Loading Requirements
IRS converters employ a synchronous-rectifier design topology and all models
regulate within spec and are stable under no-load to full load conditions.
Operation under no-load conditions however might slightly increase the output
ripple and noise.
Thermal Shutdown
The IRS converters are equipped with thermal-shutdown circuitry. If environmental conditions cause the temperature of the DC-DC converter to rise above
the designed operating temperature, a precision temperature sensor will power
down the unit. When the internal temperature decreases below the threshold
of the temperature sensor, the unit will self start. See Performance/Functional
Specifications.
Output Over-Voltage Protection
The IRS output voltage is monitored for an over-voltage condition using a
comparator. The signal is optically coupled to the primary side and if the output
voltage rises to a level which could be damaging to the load, the sensing circuitry
will power down the PWM controller causing the output voltage to decrease.
Following a time-out period the PWM will restart, causing the output voltage
to ramp to its appropriate value. If the fault condition persists, and the output
voltage again climbs to excessive levels, the over-voltage circuitry will initiate
another shutdown cycle. This on/off cycling is referred to as “hiccup” mode.
Short Circuit Condition
When a converter is in current-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 to their
appropriate value. If the short-circuit condition persists, another shutdown
cycle will be initiated. This on/off cycling is referred to as “hiccup” mode. The
hiccup cycling reduces the average output current, thereby preventing internal
temperatures from rising to excessive levels. The IRS Series is capable of
enduring an indefinite short circuit output condition.
Current Limiting
As soon as the output current increases to approximately 130% of its rated
value, the DC-DC converter will go into a current-limiting mode. In this condition,
the output voltage will decrease proportionately with increases in output current,
thereby maintaining somewhat constant power dissipation. This is commonly
referred to as power limiting. Current limit inception is defined as the point at
which the full-power output voltage falls below the specified tolerance. See
Performance/Functional Specifications. If the load current, being drawn from
the converter, is significant enough, the unit will go into a short circuit condition
as described below.
Remote Sense (models IRS-3.3/15-Q48 and IRS-5/10-Q48 only)
Note: The Sense and VOUT lines are internally connected through low-value
resistors. Nevertheless, if the sense function is not used for remote regulation
the user should connect the +Sense to +VOUT and –Sense to –VOUT at the
DC-DC converter pins. IRS series converters employ a sense feature to provide
point of use regulation, thereby overcoming moderate IR drops in PCB conductors or cabling. The remote sense lines carry very little current and therefore
require minimal cross-sectional-area conductors. The sense lines, which are
capacitively coupled to their respective output lines, are used by the feedback
control-loop to regulate the output. As such, they are not low impedance points
and must be treated with care in layouts and cabling. Sense lines on a PCB
should be run adjacent to dc signals, preferably ground.
[VOUT(+)-VOUT(–)] – [Sense(+)-Sense(–)] ≤ 10%VOUT
In cables and discrete wiring applications, twisted pair or other techniques
should be used. Output over-voltage protection is monitored at the output
voltage pin, not the Sense pin. Therefore, excessive voltage differences between
VOUT and Sense in conjunction with trim adjustment of the output voltage
can cause the over-voltage protection circuitry to activate (see Performance
Specifications for over-voltage limits). Power derating is based on maximum
output current and voltage at the converter’s output pins. Use of trim and sense
functions can cause output voltages to increase, thereby increasing output
power beyond the converter’s specified rating, or cause output voltages to climb
into the output over-voltage region. Therefore, the designer must ensure:
(VOUT at pins) x (IOUT) ≤ rated output power
Contact and PCB resistance
losses due to IR drops
+VIN
+VOUT
IOUT
+SENSE
ON/OFF
CONTROL
Sense Current
LOAD
TRIM
Sense Return
–SENSE
IOUT Return
–VIN
–VOUT
Contact and PCB resistance
losses due to IR drops
Figure 4. Remote Sense Circuit Configuration
Sense is included only on models IRS-3.3/15-Q48 and IRS-5/10-Q48.
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SDC_IRS_Q48_Series.B01.D04 Page 24 of 26
IRS-Q48 Series
On/Off Control
The input-side, remote On/Off Control function can be ordered to operate with
either logic type:
Positive ("P" suffix) logic models are enabled when the On/Off pin is left
open or is pulled high (see specifications) with respect to the –Input as per
Figure 4. Positive-logic devices are disabled when the on/off pin is pulled low
with respect to the –Input.
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
appropriate voltage when deactivated. Applying an external voltage to pin 2
when no input power is applied to the converter can cause permanent
damage to the converter.
+VIN
+Vcc
13V CIRCUIT
Negative (“N” suffix) logic devices are off when the On/Off pin is left open
or is pulled high (see specifications), and on when the pin is pulled low with
respect to the –Input. See specifications.
ON/OFF
CONTROL
Dynamic control of the remote on/off function is best accomplished with
a mechanical relay or an open-collector/open-drain drive circuit (optically
isolated if appropriate). The drive circuit should be able to sink appropriate
current (see Performance Specifications) when activated and withstand the
5V CIRCUIT
–VIN
Figure 5. Driving the Negative Logic On/Off Control Pin
(simplified circuit)
OUTPUT VOLTAGE ADJUSTMENT
+VOUT
+VIN
+VOUT
+VIN
+SENSE
+SENSE
ON/OFF
CONTROL
TRIM
RTRIM UP
LOAD
ON/OFF
CONTROL
–VOUT
Figure 6. Trim Connections to Increase Output Voltages
LOAD
–SENSE
–SENSE
–VIN
RTRIM DOWN
TRIM
–VIN
–VOUT
Figure 7. Trim Connections to Decrease Output Voltages
Trim Equations
Through-Hole Soldering Guidelines
Murata Power Solutions recommends the TH soldering specifications
below when install ing these converters. These specifications vary
depending on the solder type. Exceeding these specifications may cause
damage to the product. Your production environment may differ; therefore
please thoroughly review these guidelines with your Process Engineers.
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Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
115° C.
270° C.
7 seconds
105° C.
250° C.
6 seconds
SDC_IRS_Q48_Series.B01.D04 Page 25 of 26
IRS-Q48 Series
Encapsulated Sixteenth-Brick DOSA-Compatible
Wide Input Isolated DC-DC Converters
Conducted Emissions Performance
IRS-48/1-Q48 CE PARTS LIST:
REFERENCE
C1
C2/C5
CY3/CY4
L1
C6
CY7
CY8
CY9
CY10
DESCRIPTION
4.7uF/250V Polyester cap
10uF/100V MLCC
4700pF/250V
5mH common mode choke
220uF/80V E-cap
4700pF/250V + 470pF/250V
2*2200pF/250V
2*4700pF/250V
1000pF/250V
PART NUMBER
C212E475K9AC000
GRM32EC72A106KE05L
DE1E3KX472MA4BN01F
7448062105
UBT1K221MHD
DE1E3KX472MA4BN01F + DE1B3KX471KA4BN01F
DE2E3KY222MA3BM02F
DE1E3KX472MA4BN01F
DE1E3KX102MB4BP01F
VENDOR
Faratronic
Murata
Murata
Wurth
Nichicon
Murata
Murata
Murata
Murata
IRS-48/1-Q48 CE SCHEMATIC:
PEAK DETECTION VALUE (48Vin L):
Murata Power Solutions, Inc.
129 Flanders Rd, Westborough, MA 01581 USA
ISO 9001 and 14001 REGISTERED
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This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://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.
© 2023 Murata Power Solutions, Inc.
SDC_IRS_Q48_Series.B01.D04 Page 26 of 26
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