ULS 100-Watt Series
www.murata-ps.com
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
Typical units
FEATURES
PRODUCT OVERVIEW
Industry standard DOSA "Sixteenth-brick"
format and pinout with surface mount option
The new ULS 100 Watts series offers output
voltages of 3.3Vout (30A), 5Vout (20A), 6.5Vout
(15A), and 12Vout (8.3A). The ULS sixteenth-brick
series maintains a width of 0.9 inches while still
retaining up to 100 Watt output and full 2250 Volt
DC isolation. The PC-board mount converter family accepts 36 to 75 Volts DC inputs and delivers
fixed outputs regulated to within ±0.2%. The ULS
converters are ideal for datacom and telecom applications, cell phone towers, data centers, server
farms and network repeaters.
ULS outputs may be trimmed within ±10% of
nominal output 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
36-75 Volts DC input range, 3.3, 5, 6.5, and
12 Vdc outputs.
2250 Volt Basic input/output isolation
Up to 100 Watts total output power
High efficiency synchronous rectifier topology
Stable no-load operation with no required
external components
Operating temperature range -40 to +85°C
with derating
Certified to UL 60950-1, CSA-C22.2 No. 234,
EN60950-1 safety approvals, 2nd Edition
Extensive self-protection features
F1
Isolation
Barrier
+Vin (1)
+Vout (8)
• Switching
External
DC
Power
Source
On/Off
Control
(2)
minimum load is required. For systems requiring
controlled startup/shutdown, an external remote
On/Off control may use a switch, transistor or
digital logic. Remote Sense inputs compensate for
resistive line drops at high currents.
Many self-protection features on the ULS series
avoid both converter and external circuit hazards.
These include input undervoltage lockout and
overtemperature shutdown. The output current
limit uses the “hiccup” autorestart technique (i.e.,
the outputs may be short-circuited indefinitely).
Additional features include output overvoltage
protection too.
The synchronous rectifier topology yields high
efficiency for minimal heat buildup and “no fan”
operation.
+Sense (7)
• Filters
Controller
and Power
Transfer
Open = On
Closed = Off
(Positive
logic)
• Current Sense
-Sense (5)
Reference and
Error Amplifier
-Vin (3)
Trim (6)
-Vout (4)
Typical topology is shown
Figure 1. Simplified Block Diagram
For full details go to
www.murata-ps.com/rohs
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SDC_ULS-100 Series.B01.D11 Page 1 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Root Model
ULS-3.3/30-D48
Vout
(V)
Input
Iout
Power R/N (mV pk-pk) Regulation (max.) Vin Nom. Range
(A, max.) (W)
(V)
(V)
Typ.
Max.
Line
Load
Iin, full
load (A)
Efficiency
Dimensions
(inches)
Min.
Typ.
48
36-75
50
2.27
90%
91%
1.3x0.9x0.4
±0.125% ±0.125%
48
36-75
50
2.29
89%
91%
1.3x0.9x0.4
120
±0.125% ±0.125%
48
36-75
41
2.18
90%
93%
1.3x0.9x0.4
150
±0.125%
48
36-75
50
2.26
89%
92%
1.3x0.9x0.4
3.3
30
99
70
100
5
20
100
60
120
ULS-6.5/15-D48
6.5
15
97.5
60
ULS-12/8.3-D48
12
8.3
99.6
80
ULS-5/20-D48
Iin, no load
(mA)
±0.1%
±0.2%
±0.25%
Please refer to the Part Number Structure when ordering.
Regulation specifications describe output voltage deviations from a nominal/midpoint value to either
All specifications are typical at nominal line voltage and full load, +25°C unless otherwise noted.
extreme (50% load step).
See detailed specifications. Output capacitors are 1 μF ceramic multilayer in parallel with 10 μF and a
220µF/100V external input capacitor is needed for the ULS-12/8.3-D48 model.
I/O caps are necessary for our test equipment and may not be needed for your application.
PART NUMBER STRUCTURE
ULS - 3.3 / 30 - D48 N M H Lx - C
RoHS Hazardous Substance Compliance
(does not claim EU RoHS exemption 7b–lead in solder)
C = RoHS-6
Sixteenth Brick Series
Pin Length Option (Thru-hole only)
Blank = Standard pin length 0.180˝ (4.6mm)
L1 = 0.110˝ (2.79mm) ➀
L2 = 0.145˝ (3.68mm) ➀
Conformal Coating Option
Blank = No coating, standard
H = Coating added, optional ➀
(H option is not available on SMT models.)
Nominal Output Voltage:
Maximum Rated Output Current
Current in Amps
Input Voltage Range:
D48 = 36-75 Volts (48V nominal)
SMT Version Option
Blank = Through-hole mount
M = Surface mount (MSL Rating 3) ➁
On/Off Control Logic Option
N = Negative
P = Positive
➀ Special quantity order is required; samples available with standard pin length only.
➁ SMT (M) versions not available in sample quantities.
➂ Some model number combinations may not be available. See website or contact your local Murata sales representative.
Simplified Murata-PS logo
Product Label
Rev
As shown in figure 2, because of the small size of these products, t he product
labels contain a simplified Murata-PS logo and a character-reduced code to
indicate the model number and manufacturing date code. Not all items on
the label are always used. Please note that the label differs from the product
photograph.
To Be Discontinued *
MODEL NAME
Label 1
REG.-Nr. D216
0001
YYWW
NOTE: The following models are To Be Discontinued.
ULS-3.3/30-D48P-C
ULS-3.3/30-D48PH-C
ULS-3.3/30-D48PM-C
ULS-5/20-D48P-C
ULS-5/20-D48PH-C
ULS-5/20-D48PM-C
Figure 2. Label Artwork Layout
Serial # (4 digits)
Date code
Bar code: Data matrix
Label 2
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 2 of 34
* Last Time Buy date is 3/31/2019. Please click here to view the Discontinuance Notification.
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-3.3/30-D48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
100 mS max. duration
Input to output, continuous
None, install external fuse
Power on, referred to -Vin
Minimum
0
Typical/Nominal
Maximum
80
100
2250
None
0
0
15
99.99
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
Current-limited, no damage, short-circuit
0
30
A
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 or recommended.
INPUT
Operating voltage range
36
48
75
Vdc
Recommended External Fuse
Fast blow
10
A
Start-up threshold
Rising input voltage
32.5
34.5
35.5
Vdc
Undervoltage shutdown
Falling input voltage
31
33
34
Vdc
Overvoltage shutdown
None
Vdc
Reverse Polarity Protection
None, install external fuse
None
Vdc
Internal Filter Type
C
Output Current
Input current
Full Load Conditions
Low Line
Inrush Transient
Short Circuit Input Currrent
No Load
Shut-Down Input Current (Off)
Reflected (back) ripple current ➁
Vin = nominal
Vin = minimum
2.27
3.06
0.05
50
50
14
20
Iout = minimum, unit = ON
Measured at input with specified filter
2.31
3.12
100
150
18
30
A
A
A2-Sec.
mA
mA
mA
mA, p-p
GENERAL and SAFETY
Vin = 48V, full load
Vin = max., full load
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
90
89
Input to output, continuous
Certified to 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
91
90
%
%
2250
basic
100
3300
Vdc
MΩ
pF
Yes
2.6
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
460
Power on to Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
2% of Vout
same as above
480
5
5
500
20
20
KHz
mS
mS
10
25
µSec
±75
±150
mV
1
0.8
15
2
V
V
mA
1
15
1
2
V
V
mA
10
%
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
SMT Mounting
Remote Sense
ON = Ground pin 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
"M" suffix
Sense pins connected externally to respective
Vout pins
3.5
0
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SDC_ULS-100 Series.B01.D11 Page 3 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-3.3/30-D48 (CONT.)
OUTPUT
Conditions ➀
See Derating
Minimum
98.1
Typical/Nominal
99
Maximum
99.99
Units
W
No trim
At 50% load, no trim
User-adjustable
Via magnetic feedback
3.267
-1
-10
3.9
3.3
4.25
3.333
1
10
4.95
Vdc
% of Vnom
% of Vnom.
Vdc
0
30
30
A
33
37
44
A
Hiccup technique, autorecovery within
±1.25% of Vout
2
5
mA
Output shorted to ground, no damage
Continuous
±0.1
±0.2
100
% of Vout
% of Vout
mV pk-pk
% of Vout./°C
μF
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
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
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
98% of Vnom., after warmup
Current limiting
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
At all outputs
Low ESR, resistive load only
70
±0.02
4700
MECHANICAL (Through Hole Models)
1.3X0.9X0.4
33X22.9X10.2
0.56
16
0.04 & 0.06
1.016X1.524
Copper alloy
50
5
Outline Dimensions
(Please refer to outline drawing)
LxWxH
Weight
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
Inches
mm
Ounces
Grams
Inches
mm
µ-inches
µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
RoHS rating
With Derating
No derating
Vin = Zero (no power)
Measured in center
External filter is required
-40
-40
-55
115
125
85
120
125
130
°C
°C
°C
°C
90
10,000
3048
Class
Class
%RH
feet
meters
B
B
To +85°C
must derate -1%/1000 feet
10
-500
-152
RoHS-6
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SDC_ULS-100 Series.B01.D11 Page 4 of 34
ULS 100-Watt Series
Functional Specification Notes
➀ 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 cacacitance.
➁
➂
➃
➄
➅
➆
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.
Note that Maximum Current Derating Curves indicate an average current
at nominal input voltage. At higher temperatures and/or lower airflow, the
converter will tolerate brief full current outputs if the average RMS current
over time does not exceed the Derating curve. All Derating curves are
presented at sea level altitude. Be aware of reduced power dissipation
with increasing density altitude.
Mean Time Before Failure (MTBF) is calculated using the Telcordia
(Belcore) SR-332 Method 1, Case 3, Issue 1, ground fixed conditions. Operating temperature = +25°C, full output load, natural air convection.
The output may be shorted to ground indefinitely with no damage. The
Output Short Circuit Current shown in the specifications is an average consisting of very short bursts of full rated current to test whether the output
circuit can be repowered.
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.
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).
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
➇ Do not exceed maximum power ratings, Sense limits or output overvoltage
when adjusting output trim values.
➈ At zero output current, Vout may contain components which slightly
exceed the ripple and noise specifications.
➉ Output overload protection is non-latching. When the output overload
is removed, the output will automatically recover.
11
12
13
14
15
16
17
18
19
All models are fully operational and meet published specifications,
including “cold start” at –40°C.
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.
Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting.
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.
To avoid damage or unplanned shutdown, do not sink appreciable reverse
output current.
A fast blow fuse must be installed in series with +Vin to avoid damage to
the converter in the event that the source voltage is accidentally applied to
the converter with reverse polarity.
Although extremely unlikely, failure of the internal components of this
product may expose external application circuits to dangerous voltages,
currents, temperatures or power levels. Please thoroughly verify all applications before committing them to service. Be sure to include appropriately rated FUSES (see specifications and Application Notes) to reduce the
risk of failure.
If Sense is not wired to an external load, connect sense pins to their
respective Vout pins. Do not leave sense unconnected.
The switching frequencies of these converters are fixed; see individual
specifications for model details.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 5 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, ULS-3.3/30-D48
Efficiency and Power Dissipation
96
18
92
16
88
14
Efficiency (%)
80
10
VIN = 75V
VIN = 48V
VIN = 36V
76
8
6
72
68
4
Power Dissipation
VIN = 48V
64
2
0
60
2
4
6
8
10
12
14
16
18
Iout (Amps)
20
22
24
26
28
30
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin to Vout)
32
32
30
30
28
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin- to Vin+)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
26
Loss (Watts)
12
84
24
22
28
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
26
24
22
20
20
35
40
45
50
55
60
65
70
75
80
Ambient Temperature (°C)
Output Ripple and Noise (Vin=48V, Iout=0A, Ta=+25°C, Vout-ripple=43.3mV)
85
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
Output Ripple and Noise (Vin=48V, Iout=30A, Ta=+25°C, Vout-ripple=45.6mv)
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SDC_ULS-100 Series.B01.D11 Page 6 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, ULS-3.3/30-D48
Enable startup Delay (Vin=48V, Vout=nom, Iout=30A, Cload=4700uF,
Ta=+25°C) Trace2=Vout, Trace4=Enable
Startup Delay (Vin=48V, Vout=nom, Iout=30A, Cload=4700uF, Ta=+25°C)
Trace1=Vin, Trace2=Vout
Step Load Transient Response (Vin=48V, Vout=nom, Iout=75% to 50% of full load,
1A/uS at Ta=+25°C) +Delta=61mV, Recovery time=8.4uS
Step Load Transient Response (Vin=48V, Vout=nom, Iout=50% to 75% of full load,
1A/uS at Ta=+25°C) +Delta=64mV, Recovery time=7.6uS
Step Load Transient Response (Vin=48V, Vout=nom, Iout=50% to 75% of full load,
1A/uS at Ta=+25°C)
Thermal image with hot spot at full load (30A) current with 30°C ambient; air is flowing at
100 LFM. Air is flowing across the converter from Vin to Vout at 48V input. Identifiable and
recommended maximum value to be verified in application. Hottest spot is Q4=88.9°C.
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SDC_ULS-100 Series.B01.D11 Page 7 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
Emissions Performance, Model ULS-3.3/30-D48
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
VCC
RTN
+
C2
C3
+
DC/DC
-48V
C6
Load
C1
L1
GND
C4
C5
GND
Figure 3. Conducted Emissions Test Circuit
Graph 1. Conducted emissions performance, Positive Line,
CISPR 22, Class A, 48Vin, full load
[1] Conducted Emissions Parts List
[2] Conducted Emissions Test Equipment Used
Hewlett Packard HP8594L Spectrum Analyzer –S/N 3827A00153
2Line V-networks LS1-15V 50Ω/50Uh Line Impedance Stabilization Network
[3] Conducted Emissions Test Results
Reference
C1
Part Number
GRM32ER72A105KA01L
C2
GRM319R72A104KA01D
L1
LB16H1324
C4, C5
GRM32DR73A223KW01L
C3
UHE2A221MHD
C6
NA
Description
SMD CERAMIC-100V1000nF-X7R-1210
SMD CERAMIC
100V-100nF-±10%X7R-1206
COMMON MODE1320uH-±25%-4A-R5K21*21*12.5mm
SMD CERAMIC
1000V-0.022uF-±10%X7R-1210
Aluminum 100V-320Uf±10%-long lead
Vendor
Murata
Murata
High
Light
Murata
Nichicon
[4] Layout Recommendations
Most applications can use the filtering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional filter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN02 for further discussion.
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class A, 48Vin, full load
Contact Murata Power Solutions for Class B Emissions test circuit and conducted emissions performance test results.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 8 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-5/20-D48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
100 mS max. duration
Input to output, continuous
None, install external fuse
Power on, referred to -Vin
Minimum
0
Typical/Nominal
Maximum
80
100
2250
None
0
0
15
101
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
Current-limited, no damage, short-circuit
0
20
A
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 or recommended.
INPUT
Operating voltage range
36
48
75
Vdc
Recommended External Fuse
Fast blow
10
A
Start-up threshold
Rising input voltage
32.5
34.5
35.5
Vdc
Undervoltage shutdown
Falling input voltage
31
32.5
34
Vdc
Overvoltage shutdown
None
Vdc
Reverse Polarity Protection
None, install external fuse
None
Vdc
Internal Filter Type
C
Output Current
Input current
Full Load Conditions
Low Line
Inrush Transient
Short Circuit Input Current
No Load
Shut-Down Input Current (Off)
Reflected (back) ripple current ➁
Vin = nominal
Vin = minimum
2.29
3.05
0.05
50
50
15
15
Iout = minimum, unit = ON
Measured at input with specified filter
2.36
3.15
100
100
18
30
A
A
A2-Sec.
mA
mA
mA
mA, p-p
GENERAL and SAFETY
Vin = 48V, full load
Vin = min., full load
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
89
89
Input to output, continuous
Certified to 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
91
91
%
%
2250
basic
100
3300
Vdc
MΩ
pF
Yes
2.6
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
470
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
520
570
15
20
KHz
mS
mS
10
100
µSec
±180
±240
mV
1
0.8
15
2
V
V
mA
1
15
1
2
V
V
mA
10
%
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
SMT Mounting
Remote Sense
ON = Ground pin 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
"M" suffix
Sense pins connected externally to respective
Vout pins
3.5
0
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 9 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-5/20-D48 (CONT.)
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
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
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
Conditions ➀
See Derating
Minimum
99
Typical/Nominal
100
Maximum
101
Units
W
No trim
At 50% load, no trim
User-adjustable
Via magnetic feedback
4.95
-1
-10
5.6
5
6.3
505
1
10
9
Vdc
% of Vnom
% of Vnom.
Vdc
0
20
20
A
22
24
32
A
98% of Vnom., after warmup
Hiccup technique, autorecovery within
±1.25% of Vout
.6
Output shorted to ground, no damage
Continuous
A
Current limiting
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
At all outputs
Low ESR, resistive load only
±0.125
±0.125
120
60
±0.02
330
3300
% of Vout
% of Vout
mV pk-pk
% of Vout./°C
μF
MECHANICAL (Through Hole Models)
1.3X0.9X0.4
33X22.9X10.2
0.58
16.5
0.04 & 0.06
1.016X1.524
Copper alloy
50
5
Outline Dimensions
(Please refer to outline drawing)
LxWxH
Weight
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
Inches
mm
Ounces
Grams
Inches
mm
µ-inches
µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
With Derating
No derating
Vin = Zero (no power)
Measured in center
External filter is required
-40
-40
-55
115
125
B
B
RoHS-6
85
120
125
130
°C
°C
°C
°C
Class
Class
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 10 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, ULS-5/20-D48
Efficiency and Power Dissipation
94
22
92
20
90
18
88
16
VIN = 75V
VIN = 48V
VIN = 36V
84
14
12
82
10
80
8
78
6
Power Dissipation
VIN = 48V
76
4
74
2
72
0
2
4
6
8
10
12
Iout (Amps)
14
16
21
21
20
20
19
19
18
0.25 m/s (50 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)
16
15
17
15
13
13
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
Output Ripple and noise (Vin = 48V, Vout = nom, Iout = 20A, Cload = 330uf, Ta = +25°C)
0.25 m/s (50 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)
16
14
30
20
18
14
12
18
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin to Vout)
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin- to Vin+)
17
Loss (Watts)
Efficiency (%)
86
12
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
Output Ripple and noise (Vin = 48V, Vout = nom, Iout = 0A, Cload = 330uF, Ta = +25°C)
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 11 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, ULS-5/20-D48
Enable Startup Delay (Vin = 48V, Vout = nom, Iout = 20A, Cload = 330uF, Ta = +25°C)
Ch2 = Vout, Ch4 = Enable.
Vin Startup Delay (Vin = 48V, Vout = nom, Iout = 20A, Cload = 330uF, Ta = +25°C)
Ch1 = Vin, Ch2 = Vout.
Step Load Transient Response (Vin = 48V, Vout = nom, Iout = 75%-50%
of full load, Ta = +25°C)
Step Load Transient Response (Vin = 48V, Vout = nom, Iout = 50%-75%
of full load, Ta = +25°C)
Step Load Transient Response (Vin = 48V, Vout = nom, Iout = 50%-75%-50%
of full load, Ta = +25°C)
Thermal image with hot spot at full load (20A) current with 30°C ambient; air is flowing at
100 LFM. Air is flowing across the converter from Vin to Vout at 48V input. Identifiable and
recommended maximum value to be verified in application. Hottest spot is Q4 = 103.4°C.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 12 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
Emissions Performance, Model ULS-5/20-D48
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
VCC
RTN
+
C2
C3
+
DC/DC
-48V
C6
Load
C1
L1
GND
C4
C5
GND
Figure 4. Conducted Emissions Test Circuit
Graph 3. Conducted emissions performance, Positive Line,
CISPR 22, Class A, 48Vin, full load
[1] Conducted Emissions Parts List
[2] Conducted Emissions Test Equipment Used
Hewlett Packard HP8594L Spectrum Analyzer –S/N 3827A00153
2Line V-networks LS1-15V 50Ω/50Uh Line Impedance Stabilization Network
[3] Conducted Emissions Test Results
Reference
C1
Part Number
GRM32ER72A105KA01L
C2
GRM319R72A104KA01D
L1
LB16H1324
C4, C5
GRM32DR73A223KW01L
C3
UHE2A221MHD
C6
NA
Description
SMD CERAMIC-100V1000nF-X7R-1210
SMD CERAMIC
100V-100nF-±10%X7R-1206
COMMON MODE1320uH-±25%-4A-R5K21*21*12.5mm
SMD CERAMIC
1000V-0.022uF-±10%X7R-1210
Aluminum 100V-320Uf±10%-long lead
Vendor
Murata
Murata
High
Light
Murata
Nichicon
[4] Layout Recommendations
Most applications can use the filtering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional filter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN02 for further discussion.
Graph 4. Conducted emissions performance, Negative Line,
CISPR 22, Class A, 48Vin, full load
Contact Murata Power Solutions for Class B Emissions test circuit and conducted emissions performance test results.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 13 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-6.5/15-D48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
100 mS max. duration
Input to output, continuous
None, install external fuse
Power on, referred to -Vin
Minimum
0
Typical/Nominal
Maximum
80
100
2250
None
0
0
15
98.48
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
Current-limited, no damage, short-circuit
0
15
A
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 or recommended.
INPUT
Operating voltage range
36
48
75
Vdc
Recommended External Fuse
Fast blow
10
A
Start-up threshold
Rising input voltage
32.5
34.5
35.5
Vdc
Undervoltage shutdown
Falling input voltage
31
32.5
34
Vdc
Overvoltage shutdown
None
Vdc
Reverse Polarity Protection
None, install external fuse
None
Vdc
Internal Filter Type
C
Output Current
Input current
Full Load Conditions
Low Line
Inrush Transient
Short Circuit Input Current
No Load
Shut-Down Input Current (Off)
Reflected (back) ripple current ➁
Vin = nominal
Vin = minimum
2.18
2.91
0.05
50
41
5
15
Iout = minimum, unit = ON
Measured at input with specified filter
2.28
3.05
100
100
10
30
A
A
A2-Sec.
mA
mA
mA
mA, p-p
GENERAL and SAFETY
Vin = 48V, full load
Vin = min., full load
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
90
90
Input to output, continuous
Certified to 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
93
93
%
%
2250
basic
100
3300
Vdc
MΩ
pF
Yes
2.6
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
250
Power on to Vout regulated
Remote ON to Vout regulated
50-60-50% load step, settling time to within
1% of Vout
same as above
30
30
KHz
mS
mS
100
µSec
±55
mV
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
SMT Mounting
Remote Sense
ON = Ground pin 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
"M" suffix
Sense pins connected externally to respective
Vout pins
3.5
0
1
0.8
15
2
V
V
mA
1
15
1
2
V
V
mA
10
%
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 14 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-6.5/15-D48 (CONT.)
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
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
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
Conditions ➀
See Derating
Minimum
0
Typical/Nominal
97.5
Maximum
98.48
Units
W
No trim
At 50% load, no trim
User-adjustable
Via magnetic feedback
6.435
-1
-10
7.4
6.5
8.5
6.565
1
10
10
Vdc
% of Vnom
% of Vnom.
Vdc
0
15
15
A
18
22
25
A
98% of Vnom., after warmup
Hiccup technique, autorecovery within
±1.25% of Vout
.6
Output shorted to ground, no damage
Continuous
A
Current limiting
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
At all outputs
Low ESR, resistive load only
±0.125
±0.125
120
60
±0.02
330
3300
% of Vout
% of Vout
mV pk-pk
% of Vout./°C
μF
MECHANICAL (Through Hole Models)
1.3x0.9x0.4
33x22.9x10.2
0.58
16.5
0.04 & 0.06
1.016x1.524
Copper alloy
50
5
Outline Dimensions
(Please refer to outline drawing)
LxWxH
Weight
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
Inches
mm
Ounces
Grams
Inches
mm
µ-inches
µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
With Derating
No derating
Vin = Zero (no power)
Measured in center
External filter is required
-40
-40
-55
115
125
B
B
RoHS-6
85
120
125
130
°C
°C
°C
°C
Class
Class
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 15 of 34
ULS 100-Watt Series
Functional Specification Notes
➀ 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 cacacitance.
➁
➂
➃
➄
➅
➆
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.
Note that Maximum Current Derating Curves indicate an average current
at nominal input voltage. At higher temperatures and/or lower airflow, the
converter will tolerate brief full current outputs if the average RMS current
over time does not exceed the Derating curve. All Derating curves are
presented at sea level altitude. Be aware of reduced power dissipation
with increasing density altitude.
Mean Time Before Failure (MTBF) is calculated using the Telcordia
(Belcore) SR-332 Method 1, Case 3, Issue 1, ground fixed conditions. Operating temperature = +25°C, full output load, natural air convection.
The output may be shorted to ground indefinitely with no damage. The
Output Short Circuit Current shown in the specifications is an average consisting of very short bursts of full rated current to test whether the output
circuit can be repowered.
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.
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).
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
➇ Do not exceed maximum power ratings, Sense limits or output overvoltage
when adjusting output trim values.
➈ At zero output current, Vout may contain components which slightly
exceed the ripple and noise specifications.
➉ Output overload protection is non-latching. When the output overload
is removed, the output will automatically recover.
11
12
13
14
15
16
17
18
19
All models are fully operational and meet published specifications,
including “cold start” at –40°C.
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.
Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting.
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.
To avoid damage or unplanned shutdown, do not sink appreciable reverse
output current.
A fast blow fuse must be installed in series with +Vin to avoid damage to
the converter in the event that the source voltage is accidentally applied to
the converter with reverse polarity.
Although extremely unlikely, failure of the internal components of this
product may expose external application circuits to dangerous voltages,
currents, temperatures or power levels. Please thoroughly verify all applications before committing them to service. Be sure to include appropriately rated FUSES (see specifications and Application Notes) to reduce the
risk of failure.
If Sense is not wired to an external load, connect sense pins to their
respective Vout pins. Do not leave sense unconnected.
The switching frequencies of these converters are fixed; see individual
specifications for model details.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 16 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, ULS-6.5/15-D48
Efficiency and Power Dissipation
100
18
95
Efficiency (%)
85
80
75
70
Vin = 36V
14
Vin = 48V
12
Vin = 75V
10
Power Dissipation
(Vin = 48V)
8
6
65
60
4
55
2
50
0
0
2
4
6
8
Iout (Amps)
10
12
16
16
15
15
3.0m/s(600LFM)
2.5m/s(500LFM)
2.0m/s(400LFM)
13
1.5m/s(300LFM)
1.0m/s(200LFM)
0.5m/s(100LFM)
12
14
16
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin to Vout)
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin- to Vin+)
14
Loss (Watts)
16
90
11
3.0m/s(600LFM)
14
2.5m/s(500LFM)
2.0m/s(400LFM)
13
1.5m/s(300LFM)
1.0m/s(200LFM)
0.5m/s(100LFM)
12
11
10
35
40
45
50
55
60
65
70
75
Ambient Temperature (ºC)
Output ripple and Noise (Vin=48V, Iout=0, Ta=+25°C)
Vout ripple=17.5mV
80
85
10
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
Output ripple and Noise (Vin=48V, Iout=15A, Ta=+25°C)
Vout ripple=23.8mV
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 17 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, ULS-6.5/15-D48
Enable Startup Delay (Vin=48V, Iout=15A, Cload=3300uf, Ta=+25°C) Trace 2=Vout,
Trace 4=Enable
Startup Delay (Vin=48V, Iout=15A, Cload=3300uF, Ta=+25°C) Trace 1=Vin,
Trace 2=Vout
Step Load Transient Response (Vin=48V, Vout=nom, Iout= 75% to 50% of full load,
1A/uS at Ta=+25°C) +Delta=67mV, Rocovery time=0uS
Step Load Transient Response (Vin=48V, Vout=nom, Iout= 50% to 75% of full load,
1A/uS at Ta=+25°C) +Delta=80mV, Rocovery time=10uS
Step Load Transient Response (Vin=48V, Vout=nom, Iout= 50% to 75% of full load,
1A/uS at Ta=+25°C)
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 18 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
Emissions Performance, Model ULS-6.5/15-D48
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
[3] Conducted Emissions Test Results
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
VCC
RTN
C1 C2
C3
L1
L2
C4 C5
+
C6 C7
+
DC/DC
-48V
C8
C9
C10
C11
C12
LOAD
GND
Graph 5. Conducted emissions performance, Positive Line,
CISPR 22, Class A, 48Vin, full load
GND
Figure 5. Conducted Emissions Test Circuit
[1] Conducted Emissions Parts List
Reference
Part Number
Description
C1, C2,
C3, C4, GRM32ER72A105KA01L SMD CERAMIC-100V-1000nF-X7R-1210
C5
SMD CERAMIC100V-100nF-±10%C6
GRM319R72A104KA01D
X7R-1206
L1, L2
PG0060T
COMMON MODE-473uH-±25%-14A
C8, C9,
SMD CERAMIC 630V-0.22uF-±10%GRM55DR72J224KW01L
C10, C11
X7R-2220
C7
UHE2A221MHD
Aluminum100V-220Uf-±10%-long lead
C12
NA
Vendor
Murata
Murata
Pulse
Murata
Nichicon
[2] Conducted Emissions Test Equipment Used
Hewlett Packard HP8594L Spectrum Analyzer –S/N 3827A00153
2Line V-networks LS1-15V 50Ω /50Uh Line Impedance Stabilization Network
Graph 6. Conducted emissions performance, Negative Line,
CISPR 22, Class A, 48Vin, full load
[3] Layout Recommendations
Most applications can use the filtering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional filter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN-02 for further discussion.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 19 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-12/8.3-D48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
100 mS max. duration
Input to output, continuous
None, install external fuse
Power on, referred to -Vin
Minimum
0
Typical/Nominal
Maximum
80
100
2250
None
0
0
15
100.6
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
Current-limited, no damage, short-circuit
0
8.3
A
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 or recommended.
INPUT
Operating voltage range
36
48
75
Vdc
Recommended External Fuse
Fast blow
10
A
Start-up threshold
Rising input voltage
32.5
34.5
35.5
Vdc
Undervoltage shutdown
Falling input voltage
31
32.5
34
Vdc
Overvoltage shutdown
None
Vdc
Reverse Polarity Protection
None, install external fuse
None
Vdc
Internal Filter Type
C
Output Current
Input current
Full Load Conditions
Low Line
Inrush Transient
Short Circuit Input Current
No Load Input Current
Shut-Down Input Current (Off)
Reflected (back) ripple current ➁
Vin = nominal
Vin = minimum
2.26
3.01
0.05
.1
50
5
15
Iout = minimum, unit = ON
Measured at input with specified filter
2.35
3.14
100
150
10
30
A
A
A2-Sec.
mA
mA
mA
mA, p-p
GENERAL and SAFETY
Vin = 48V, full load
Vin = min., full load
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
89
89
Input to output, continuous
Certified to 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
92
92
%
%
2250
basic
100
3300
Vdc
MΩ
pF
Yes
2.6
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
470
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
520
570
20
20
KHz
mS
mS
100
µSec
±180
±240
mV
1
0.8
15
2
V
V
mA
1
15
1
2
V
V
mA
10
%
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
SMT Mounting
Remote Sense
ON = Ground pin 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
"M" suffix
Sense pins connected externally to respective
Vout pins
3.5
0
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SDC_ULS-100 Series.B01.D11 Page 20 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS, ULS-12/8.3-D48 (CONT.)
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
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
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
Conditions ➀
See Derating
Minimum
98.6
Typical/Nominal
99.6
Maximum
100.6
Units
W
No trim
At 50% load, no trim
User-adjustable
Via magnetic feedback, static OVP
11.88
-1
-10
13.8
12
14.5
12.12
1
10
15.8
Vdc
% of Vnom
% of Vnom.
Vdc
0
8.3
8.3
A
9
10.5
12.5
A
98% of Vnom., after warmup
Hiccup technique, autorecovery within
±1.25% of Vout
0.6
Output shorted to ground, no damage
Continuous
A
Current limiting
Vin = min. to max., Vout = nom., Iout = nom.
Iout = min. to max., Vin = 48V
5 Hz- 20 MHz BW
At all outputs
Low ESR, resistive load only
±0.125
±0.25
150
80
±0.02
220
3300
% of Vout
% of Vout
mV pk-pk
% of Vout./°C
μF
MECHANICAL (Through Hole Models)
1.3X0.9X0.4
33X22.9X10.2
0.56
16
0.04 & 0.06
1.016X1.524
Copper alloy
50
5
Outline Dimensions
(Please refer to outline drawing)
LxWxH
Weight
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
Inches
mm
Ounces
Grams
Inches
mm
µ-inches
µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
RoHS rating
With Derating
No derating
Vin = Zero (no power)
Measured in center
External filter is required
-40
-40
-55
115
125
85
120
125
130
°C
°C
°C
°C
90
10,000
3048
Class
Class
%RH
feet
meters
B
B
To +85°C
must derate -1%/1000 feet
10
-500
-152
RoHS-6
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 21 of 34
ULS 100-Watt Series
Functional Specification Notes
➀ 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 cacacitance.
➁
➂
➃
➄
➅
➆
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.
Note that Maximum Current Derating Curves indicate an average current
at nominal input voltage. At higher temperatures and/or lower airflow, the
converter will tolerate brief full current outputs if the average RMS current
over time does not exceed the Derating curve. All Derating curves are
presented at sea level altitude. Be aware of reduced power dissipation
with increasing density altitude.
Mean Time Before Failure (MTBF) is calculated using the Telcordia
(Belcore) SR-332 Method 1, Case 3, Issue 1, ground fixed conditions. Operating temperature = +25°C, full output load, natural air convection.
The output may be shorted to ground indefinitely with no damage. The
Output Short Circuit Current shown in the specifications is an average consisting of very short bursts of full rated current to test whether the output
circuit can be repowered.
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.
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).
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
➇ Do not exceed maximum power ratings, Sense limits or output overvoltage
when adjusting output trim values.
➈ At zero output current, Vout may contain components which slightly
exceed the ripple and noise specifications.
➉ Output overload protection is non-latching. When the output overload
is removed, the output will automatically recover.
11
12
13
14
15
16
17
18
19
All models are fully operational and meet published specifications,
including “cold start” at –40°C.
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.
Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting.
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.
To avoid damage or unplanned shutdown, do not sink appreciable reverse
output current.
A fast blow fuse must be installed in series with +Vin to avoid damage to
the converter in the event that the source voltage is accidentally applied to
the converter with reverse polarity.
Although extremely unlikely, failure of the internal components of this
product may expose external application circuits to dangerous voltages,
currents, temperatures or power levels. Please thoroughly verify all applications before committing them to service. Be sure to include appropriately rated FUSES (see specifications and Application Notes) to reduce the
risk of failure.
If Sense is not wired to an external load, connect sense pins to their
respective Vout pins. Do not leave sense unconnected.
The switching frequencies of these converters are fixed; see individual
specifications for model details.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 22 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, ULS-12/8.3-D48
Efficiency and Power Dissipation
96
18
92
16
88
14
12
VIN = 75V
VIN = 48V
VIN = 36V
80
76
10
8
6
72
68
0.83
1.66
2.49
3.32
4.15
4.98
Iout (Amps)
5.81
6.64
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin- to Vin+)
8.8
8.3
8.3
0.25 m/s (50 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)
6.8
6.3
5.8
5.3
0
8.3
7.47
0.25 m/s (50 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)
7.8
Output Current (Amps)
Output Current (Amps)
7.3
2
Maximum Current Temperature Derating at Sea Level
(Vin = 48V, airflow is from Vin to Vout)
8.8
7.8
4
Power Dissipation
VIN = 48V
64
60
Loss (Watts)
Efficiency (%)
84
7.3
6.8
6.3
5.8
30
35
40
45
50
55
60
65
70
75
80
Ambient Temperature (°C)
Output ripple and Noise (Vin=48V, Iout=0, Cload= 1uf || 10uF, Ta=+25°C)
Vout ripple=61mV
85
5.3
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
Output ripple and Noise (Vin=48V, Iout=8.3A, Cload= 1uf || 10uF, Ta=+25°C)
Vout ripple=66mV
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 23 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
TYPICAL PERFORMANCE DATA, ULS-12/8.3-D48
Enable Startup Delay (Vin=48V, Iout=8.3A, Cload=3300uf, Ta=+25°C) Trace 2=Vout,
Trace 4=Enable
Startup Delay (Vin=48V, Iout=8.3A, Cload=3300uF, Ta=+25°C) Trace 1=Vin,
Trace 2=Vout
Step Load Transient Response (Vin=48V, Vout=nom, Iout= 75% to 50% of full load,
1A/uS at Ta=+25°C) +Delta=166mV, Rocovery time=11.8uS
Step Load Transient Response (Vin=48V, Vout=nom, Iout= 50% to 75% of full load,
1A/uS at Ta=+25°C) +Delta=172mV, Rocovery time=12uS
Step Load Transient Response (Vin=48V, Vout=nom, Iout= 50% to 75% of full load,
1A/uS at Ta=+25°C)
Thermal image with hot spot at full load current (8.3A) with 30°C ambient; air is flowing at
100 LFM. Air is flowing across the converter from Vin to Vout at 48V input. Identifiable and
recommended maximum value to be verified in application. Hottest spot is Q4=86.2°C.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 24 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
Emissions Performance, Model ULS-12/8.3-D48
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
[3] Conducted Emissions Test Results
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
VCC
RTN
L1
+
C1
C2 C3
+
DC/DC
-48V
C4
C5
C6
LOAD
GND
Graph 5. Conducted emissions performance, Positive Line,
CISPR 22, Class A, 48Vin, full load
GND
Figure 5. Conducted Emissions Test Circuit
[1] Conducted Emissions Parts List
Reference
C1
C2
L1
C4, C5
C3
C6
Part Number
Description
SMD CERAMIC
GRM32ER72A105KA01L
100V-1000nF-X7R-1210
SMD CERAMIC
GRM319R72A104KA01D
100V-100nF-±10%-X7R-1206
COMMON MODE
LB16H1324
1320uH-±25%-4A-R5K-21 *21*12.5mm
SMD CERAMIC
GRM32DR73A223KW01L
1000V-0.022uF-±10%-X7R-1210
Aluminum
UHE2A221MHD
100V-320Uf-±10%-long lead
NA
Vendor
Murata
Murata
High
Light
Murata
Nichicon
[2] Conducted Emissions Test Equipment Used
Hewlett Packard HP8594L Spectrum Analyzer –S/N 3827A00153
2Line V-networks LS1-15V 50Ω /50Uh Line Impedance Stabilization Network
Graph 6. Conducted emissions performance, Negative Line,
CISPR 22, Class A, 48Vin, full load
[3] Layout Recommendations
Most applications can use the filtering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional filter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN-02 for further discussion.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 25 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
MECHANICAL SPECIFICATIONS, THROUGH-HOLE MOUNT
TOP VIEW
8
1
Pin
3
7
2
6
2
5
1
4
0.136
(3.45)
0.010 minimum clearance
between standoffs and
highest component
Important! Always connect the sense pins. If they
are not connected to a remote load, wire each
sense pin to its respective voltage output at the
converter pins.
END VIEW
0.400 (10.16) Max
3
The 0.145-inch pin length is shown. Please refer to
the part number structure for alternate pin lengths.
Pin material: Copper alloy. Plating: Gold over nickel
SIDE VIEW
Please note that some competitive units may use
different pin numbering or alternate outline views;
however, all units are plugin-compatible.
PINS 1-3,5-7:
φ0.040±0.001(1.016±0.025)
PINS 4,8:
φ0.062±0.001(1.575±0.025)
1.100 (27.9)
0.078 ±0.005 6X
INPUT/OUTPUT CONNECTIONS
Function
Pin
Function
–Vin
4
–Vout
5
–Sense
On/Off Control 6
Trim
7
+Sense
+Vin
8
+Vout
0.100 ±0.005 2X
It is recommended that no parts be placed beneath
the converter
4
Dimensions are in inches (mm) shown for ref. only.
5
Third Angle Projection
2
6
7
0.90 (22.9)
3
0.600 (15.24)
BOTTOM PIN VIEW
Standard pin length 0.180 in.
For L2 pin length option in model no.,
cut the pin length to 0.145 in.
8
1
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
1.30 (33.0)
FINISHED HOLE SIZES
@ PINS 1-3, 6, 5, 7
(PRI)
(PER IPC-D-275, LEVEL C)
1.100
[27.94]
.048-.062
22.9
.90
11.7
.46
CL
(SEC)
3.81
.150
8
1
7.62
.300
7
2
6
7.62
.300
5
3
.100 MIN
ANNULAR RING
FOR ALL PIN
SHOULDERS
Components are shown for reference only
and may vary between units.
RECOMMENDED FOOTPRINT
(VIEW THROUGH CONVERTER)
TOP VIEW
4
14.0
.55
CL
33
1.30
CL
3.81
.150
FINISHED HOLE SIZES
@ PINS 4 & 8
(PER IPC-D-275, LEVEL C)
.070-.084
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 26 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT
Anti-static foam
Corner spacer
2 cartons
per box
79
(
12.
128
6 (3
ts
uni
ts
uni
Each tray is 4 x 8 units
(32 units total per tray)
20)
128 units
per carton
11.42 (290)
13.
)
350
128
Label
256 units total per box
All materials in contact with the units are anti-static protective.
Dimensions are in inches (mm).
Corrugated
cardboard box
Label
SHIPPING TRAY DIMENSIONS
Material: Low density, closed cell polyethylene anti-static foam
9.84
(250.00)
0.24
(6.00)
9.84
(250.00)
0.47
(12.00)
4-C 0.26
(6.5)
0.87
(22.00)
0.59
(15.00)
Dimensions are in milimeters.
1
.3
R0 .00)
(8
Tolerances (unless otherwise specified):
.XX ± 0.5
.XXX ± 0.25
Angles ± 2˚
1.34
(34.00)
1.97
(50.00)
0.31
(8.00)
0.51
(13.00)
0.91
(23.00)
Third Angle Projection
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SDC_ULS-100 Series.B01.D11 Page 27 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
MECHANICAL SPECIFICATIONS, SURFACE MOUNT (MSL RATING 3)
PIN SIDE VIEW
Pin
3
33.02
1.30
1
22.86
0.90
15.24
0.600
7.62
0.300
15.24
0.600
2
INPUT/OUTPUT CONNECTIONS
Function
Pin
Function
–Vin
4
–Vout
5
–Sense
On/Off Control 6
Trim
7
+Sense
+Vin
8
+Vout
Important! Always connect the sense pins. If they
are not connected to a remote load, wire each
sense pin to its respective voltage output at the
converter pins.
It is recommended that no parts be placed beneath
the converter
0.51
0.020 Min
1.57
0.062 8X
Please note that some competitive units may use
different pin numbering or alternate outline views;
however, all units are plugin-compatible.
9.50 ±0.5
0.374 ±0.02
3.81
0.150
Pin material: Copper alloy. Plating: Gold over nickel
27.94
1.100
RECOMMEND PCB FOOTPRINT
27.94
1.100
3.05
0.120
4.32
0.170
Dimensions are in inches (mm) shown for ref. only.
8
1
Third Angle Projection
5
3
4
34.04
1.34
23.88
0.94
6
15.24
0.600
2
7.62
0.300
15.24
0.600
7
UNLESS OTHERWISE SPECIFIED
ALL DIMENSION ARE IN INCHES[MILIMETER];
ALL TOLERANCES: ×.××in ,±0.02in(×.×mm, ±0.5mm);
×.×××in ,±0.01in(×.××mm ,±0.25mm)
COMPONENTS WILL VARY BETWEEN MODELS
φ0.07 MIN PAD
6 OR 8 PLACES AS REQUIRED
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only
and may vary between units.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 28 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
TAPE AND REEL INFORMATION
330.20
13.00
TAPE AND REEL
(200 UNITS
PER REEL)
13.00
.512
101.60
4.00
CORE
44.0
1.73
REF
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.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 29 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
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 DATEL ULS 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.
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.
Pre-Bias Protection
For applications where a pre-bias potential can be present at the output of
the power module it is recommended that either blocking diodes are added
in series with the Vout power lines or, a preferred solution is to use an OR-ing
FET controller like the LM5050-1 High-Side & LM5051 Low-Side OR-ing FET
Controller from TI. Starting the module into a pre-bias condition can cause
permanent damage to the module.
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 ULS 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 ULS 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 6 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.
I/O Filtering, Input Ripple Current, and Output Noise
All models in the ULS 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 6) 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 6, CBUS and LBUS simulate a typical dc voltage bus. Your specific
system configuration may necessitate additional considerations.
TO
OSCILLOSCOPE
+VIN
LBUS
+
VIN
CURRENT
PROBE
CBUS
CIN
–
–VIN
CIN = 33µF, ESR < 700mΩ @ 100kHz
CBUS = 220µF, ESR < 100mΩ @ 100kHz
LBUS = 12µH
Figure 6. Measuring Input Ripple Current
In critical applications, output ripple/noise (also referred to as periodic and
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.
+SENSE
+VOUT
C1
C2
SCOPE
RLOAD
–VOUT
–SENSE
C1 = 1µF
C2 = 10µF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 7. Measuring Output Ripple/Noise (PARD)
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SDC_ULS-100 Series.B01.D11 Page 30 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
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.
Minimum Output Loading Requirements
ULS 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 ULS 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 ULS 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.
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.
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 ULS Series is capable of enduring an
indefinite short circuit output condition.
Remote Sense
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. ULS 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
+VOUT
+VIN
IOUT
+SENSE
Sense Current
ON/OFF
CONTROL
TRIM
LOAD
Sense Return
–SENSE
IOUT Return
–VIN
–VOUT
Contact and PCB resistance
losses due to IR drops
Figure 8. Remote Sense Circuit Configuration
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, applying +3.5V to +15V with respect to –Input) as per
Figure 9. Positive-logic devices are disabled when the on/off pin is pulled low
(0 to 1V with respect to –Input).
Negative (“N” suffix) logic devices are off when pin is left open (or pulled
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SDC_ULS-100 Series.B01.D11 Page 31 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
high, applying +2.5V to +15V), and on when pin is pulled low (–0.1 to +0.8V)
with respect to –Input as shown in Figure 9.
+VIN
+Vcc
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 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.
13V CIRCUIT
ON/OFF
CONTROL
5V CIRCUIT
–VIN
Figure 9. Driving the Negative Logic On/Off Control Pin
(simplified circuit)
OUTPUT VOLTAGE ADJUSTMENT
Trim Equations
RT DOWN (kΩ) =
Where ∆ = |
5.11
∆
+VOUT
+VIN
Trim Down
– 10.22
+SENSE
VOUT – VNOM
|
VNOM
ON/OFF
CONTROL
Trim Up
RT UP (kΩ) =
Where ∆ = |
5.11 × VNOM x (1 + ∆)
1.225 × ∆
TRIM
LOAD
RTRIM UP
–SENSE
–
5.11
∆
– 10.22
–VIN
VOUT – VNOM
|
VNOM
–VOUT
Figure 10. Trim Connections To Increase Output Voltages
Connect sense to its respective Vout pin if sense is not used with a remote load.
Note: “∆” is always a positive value.
“VNOM” is the nominal, rated output voltage.
“VOUT” is the desired, changed output voltage.
+VIN
+VOUT
+SENSE
ON/OFF
CONTROL
RTRIM DOWN
TRIM
LOAD
–SENSE
–VIN
–VOUT
Figure 11. Trim Connections To Decrease Output Voltages
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SDC_ULS-100 Series.B01.D11 Page 32 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
Through-hole Soldering Guidelines
SMT Reflow Soldering Guidelines
Murata Power Solutions recommends the TH soldering specifications below when installing 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.
The surface-mount reflow solder profile shown below is suitable for SAC305 type leadfree solders. This graph should be used only as a guideline. Many other factors influence
the success of SMT reflow soldering. Since your production environment may differ,
please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted
products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
115° C.
Maximum Pot Temperature
270° C.
Maximum Solder Dwell Time
7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
6 seconds
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SDC_ULS-100 Series.B01.D11 Page 33 of 34
ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
Vertical Wind Tunnel
IR Transparent
optical window
Unit under
test (UUT)
Variable
speed fan
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.
IR Video
Camera
Precision
low-rate
anemometer
3” below UUT
Ambient
temperature
sensor
Airflow
collimator
Heating
element
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 12. Vertical Wind Tunnel
Murata Power Solutions, Inc.
129 Flanders Road, Westborough MA 01581 U.S.A.
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: 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.
© 2019 Murata Power Solutions, Inc.
www.murata-ps.com/support
SDC_ULS-100 Series.B01.D11 Page 34 of 34
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