SPM25 Series
www.murata-ps.com
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
Output (V)
Typical unit
Current (A)
3.3
7.575
5
5
12
2.1
FEATURES
PRODUCT OVERVIEW
2:1 Input voltage range ( D48 = 36-75V)
The SPM25 series isolated DC-DC converters
represent the next generation in Industrial Potted
Module Technology. Featuring a full 25-Watt output
in one square inch of board area, the SPM25
series isolated DC-DC converter family offers
efficient regulated DC power for printed circuit
board mounting. The 1˝ x 1˝ x 0.41˝ (25.4 x 25.4 x
10.41 mm) converter accepts a 2:1 input voltage
range of 36 to 75 Volts (D48), ideal for industrial
applications.
1˝ x 1˝ x 0.41˝ dimensions.
Adjustable Vout (+10% to -10%)
High efficiency
Positive & negative logic, remote on/off control
option
Monotonic startup into pre-bias output conditions
Continuous short circuit protection
Over-temperature protection
Intended target markets include transportation,
medical systems, electronic test equipment, industrial processing equipment, industrial applications
where power modules must meet rugged environmental requirements, high power density, and
Over-voltage protection
Low output ripple and noise
Strong thermal derating characteristics
Nominal Input (V)
D48 = 36-75V (48V nom)
where isolated output voltages are required. These
converters offer a feature/option set including:
through-hole mounting, positive or negative logic
(remote on/off), over-current & over-temperature
protection, under-voltage lockout. The input voltage
range covers the standard Industrial requirements
with a regulated output voltage and power rating
up to 25W.
Modules provide voltage isolation (basic
insulation) from input to output of up to 1600V. The
Operating ambient temperature range is -40°C to
+85°C.The module delivers full output power to
+70°C with no airflow. These parts are ideal for
applications that do not require any heat sinking or
forced air cooling.
Operational temperature range –40°C to +85°C
1600V I/O isolation
Packaged in a five-sided EMI shielding metal
package with non-conductive base
Certified to UL 60950-1, CAN/CSA-C22.2 No.
60950-1, IEC60950-1 safety approvals, 2nd
edition, with AM1
*TPMBUJPO
Barrier
+Vin (1)
F1
+Vout (3)
t4XJUDIJOH
External
DC
Power
Source
On/Off
Control
(6)
t'JMUFST
Controller
and Power
5SBOTGFS
t$VSSFOU4FOTF
Open = On
$MPTFE 0GG
1PTJUJWF
MPHJD
Reference and
Error Amplifier
Trim (4)
-Vin (2)
-Vout (5)
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions
recommends an external fuse.
For full details go to
www.murata-ps.com/rohs
(pending)
REG.-Nr. D806
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MDC_SPM25.A04 Page 1 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀ ➂
Output
Input
R/N (mVp-p)
Root Models ➀
SPM25-033-D48
VOUT
(V)
IOUT Total
(A, Power
max) (W) Typ. ➁ Max.
3.3
7.575
25
50
Regulation (Max.)
VIN
IIN, no
Nom. Range load
(V)
(V)
(mA)
IIN,
full
load
(A)
Efficiency
Dimensions
Line
Load
Min.
Typ.
Case (inches)
Case (mm)
80
±0.1%
±0.2%
48
36-75
75
0.58
87%
89.5%
1.0" x 1.0" x 0.41"
25.4 x 25.4 x 10.41
SPM25-050-D48
5
5
25
50
80
±0.1%
±0.2%
48
36-75
30
0.57
88.3%
91.0%
1.0" x 1.0" x 0.41"
25.4 x 25.4 x 10.41
SPM25-120-D48
12
2.1
25.2
65
120
±0.1%
±0.125%
48
36-75
20
0.6
85.0%
87%
1.0" x 1.0" x 0.41"
25.4 x 25.4 x 10.41
Notes:
➀ Please refer to the part number structure for additional options and complete ordering part numbers.
➁ Ripple and Noise is shown at 20 MHz bandwidth.
➂ All specifications are at nominal line voltage and full load, +25 °C. unless otherwise
noted. See detailed specifications for full conditions.
Output capacitors are 1 μF in parallel with 10 μF. The input cap is 4.7 μF (SPM25120-D48) and 22 μF (SPM25-033-D48, SPM25-050-D48), low ESR.
PART NUMBER STRUCTURE
SPM25- 050 - D48 P Lx - C
Single Output Potted Module
25-Watt Series
Nominal Output Voltage
in Tenths of a Volt
(033=3.3V, 050 = 5V, 120 = 12V)
Input Voltage Range
D48 = 36-75 Vdc
RoHS-6 Hazardous Substance Compliance
(Does not claim EU RoHS exemption 7b, lead in solder)
Pin Length Option (through-hole only)
Blank = Std. pin length 0.15˝ (3.8mm)
L1 = 0.110˝ (2.79mm)➀
On/Off Control Logic
Blank = No On/Off & no Trim
P = Positive
N = Negative
➀ Special quantity order is required; samples available with standard pin length only.
➁ Some model number combinations may not be available. See website or contact your local Murata sales representative.
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MDC_SPM25.A04 Page 2 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
FUNCTIONAL SPECIFICATIONS – MODEL SPM25-033-D48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Minimum
Typical/Nominal
Maximum
Units
Input Voltage, Continuous
0
80
Vdc
Input Voltage, Transient
100 mS max. duration
100
Vdc
Isolation Voltage
Input to output, continuous
1600
Vdc
On/Off Remote Control
Power on, referred to -Vin
0
15
Vdc
Output Power
0
25.25
W
Output Current
Current-limited, no damage, short-circuit protected
0.7575
7.575
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 shutdown
Turn-On/Turn-Off Hysteresis
Internal Filter Type
Input current
Full Load Input Current
Low Line Input Current
Inrush Transient
Short Circuit Input Current
No Load Input Current
Shut-Down Input Current (Off, UV, OT)
Reflected (back) ripple current ➁
Fast blow
Rising input voltage
Falling input voltage
36
48
34
32
35.2
34
1.5
LC
Vin = nominal
Vin = minimum
0.58
0.79
0.05
50
75
1
30
Iout = minimum, unit = ON
Measured at input with specified filter
75
1.5
36
35.2
Vdc
A
Vdc
Vdc
Vdc
0.6
0.81
A
A
A2-Sec.
mA
mA
mA
mA, p-p
100
100
2
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
Vin = 48V, full load
Vin = min., full load
87
86.5
Input to output, continuous
1600
89.5
57.5
%
%
Vdc
basic
10
1000
Certified to UL-60950-1, CSA-C22.2 No. 609501, IEC60950-1, 2nd edition, with AM1
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient = +25°C
MΩ
pF
Yes
Hours x 106
TBD
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
300
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
330
360
50
50
KHz
mS
mS
180
250
μSec
±30
±100
mV
0.8
15
V
V
mA
15
0.7
V
V
mA
FEATURES and OPTIONS
Remote On/Off Control ➂
“N” suffix
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix
Positive Logic, ON state
Positive Logic, OFF state
Control Current
ON = Ground pin or external voltage
OFF = Pin open or external voltage
Open collector/drain
-0.7
10
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
10
-0.7
1
1
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MDC_SPM25.A04 Page 3 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
FUNCTIONAL SPECIFICATIONS (CONT.) – MODEL SPM25-033-D48
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range
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
Minimum
Typical/Nominal
Maximum
Units
See Derating
0.0
25
25.25
W
No trim
At 50% load, no trim
User-adjustable
Via magnetic feedback
3.267
-1
-10
4.2
3.3
5
3.333
1
10
5.7
Vdc
% of Vnom
% of Vnom.
Vdc
98% of Vnom., after warmup
0.7575
8
7.575
10
7.575
11.3
A
A
0.3
A
±0.1
±0.2
80
% of Vout
% of Vout
mV pk-pk
% of Vnom./°C
μF
Hiccup technique, autorecovery within
±1.25% of Vout
Output shorted to ground, no damage
Continuous
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
50
±0.02
2000
MECHANICAL
Outline Dimensions
(Please refer to outline drawing)
Weight
1" x 1" x 0.41"
25.4 x 25.4 x 10.41 mm
0.69
19.56
0.04
1.016
Copper alloy
50
5
WxLxH
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
Case Material
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
See derating
No derating
Tin plated steel with black powder coat
Vin = Zero (no power)
Measured in center
External filter is required
-40
-40
-55
110
115
B
B
RoHS-6
85
105
°C
°C
125
120
°C
°C
Class
Class
Notes
➀ Unless otherwise noted, all specifications are at nominal input voltage, nominal output voltage and full load. General conditions are +25˚ Celsius ambient temperature,
near sea level altitude, natural convection airflow. All models are tested and specified
with external parallel 1 μF and 10 μF output capacitors. The external input capacitor
is 22 μF. All capacitors are low-ESR types wired close to the converter.
➁ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth.
Input filtering is Cbus=220 μF, Cin=33 μF and Lbus=12 μH.
➂ The Remote On/Off Control is referred to -Vin.
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MDC_SPM25.A04 Page 4 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
TYPICAL PERFORMANCE DATA, SPM25-033-D48
Efficiency vs. Line Voltage and Load Current @ 25°C
4.00
3.50
Power Dissipation (Watts)
92
90
88
86
84
82
80
78
76
74
72
70
68
66
64
62
0.82
Power Dissipation
3.00
2.50
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 75V
2.00
1.50
1.00
0.50
0.82
1.65
2.49
3.32
4.16
5.0
5.83
6.66
7.50
1.65
4.16
5.00
5.83
6.66
7.50
7.575
Maximum Current Temperature Derating at sea level
Vin = 48 (air flow from J1 to J3 on PCB)
8
8
7
7
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
6
Output Current (Amps)
6
5
4
3
2
1
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
5
4
3
2
1
0
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
Ambient Temperature (°C)
8
7
7
6
Output Current (Amps)
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
5
55
60
65
70
75
80
85
80
85
Maximum Current Temperature Derating at sea level
Vin = 75 (air flow from J1 to J3 on PCB)
8
6
50
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
Vin = 60 (air flow from J1 to J3 on PCB)
Output Current (Amps)
3.32
Output Load Curre nt (Amps)
Maximum Current Temperature Derating at sea level
Vin = 36 (air flow from J1 to J3 on PCB)
Output Current (Amps)
2.49
7.575
4
3
2
1
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
5
4
3
2
1
0
0
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
30
35
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
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MDC_SPM25.A04 Page 5 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
TYPICAL PERFORMANCE DATA, SPM25-033-D48
Start-up Delay(Vin=48V, Iout=7.5A, Ta=+25°C) Ch1=Vin, Ch4=Vout
Enable Start-up Delay(Vin=48V, Iout=7.5A, Ta=+25°C) Ch1=Enable, Ch4=Vout
Output Ripple and Noise (Vin = 48V, Io = 0A, Cload = 1μF || 10μF, Ta = +25°C)
Output Ripple and Noise (Vin = 48V, Io = 7.5A, Cload = 1μF || 10μF, Ta = +25°C)
Step Load Transient Response(Vin=48V, Vout=nom,
Iout=50 to 100% of full load, Cout=1μF || 10μF)
v
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MDC_SPM25.A04 Page 6 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
FUNCTIONAL SPECIFICATIONS – MODEL SPM25-050-D48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Minimum
Typical/Nominal
Maximum
Units
Input Voltage, Continuous
0
80
Vdc
Input Voltage, Transient
100 mS max. duration
100
Vdc
Isolation Voltage
Input to output, continuous
1600
Vdc
On/Off Remote Control
Power on, referred to -Vin
0
15
Vdc
Output Power
0
25.25
W
Output Current
Current-limited, no damage, short-circuit protected
0
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 shutdown
Turn-On/Turn-Off Hysteresis
Internal Filter Type
Input current
Full Load Input Current
Low Line Input Current
Inrush Transient
Short Circuit Input Current
No Load Input Current
Shut-Down Input Current (Off, UV, OT)
Reflected (back) ripple current ➁
Pre-biased startup
Fast blow
Rising input voltage
Falling input voltage
36
48
33
31.5
34
32.5
1.5
LC
Vin = nominal
Vin = minimum
0.57
0.76
0.05
50
30
1
30
Monotonic
Iout = minimum, unit=ON
Measured at input with specified filter
External output voltage < Vset
75
1.5
35
34.5
Vdc
A
Vdc
Vdc
Vdc
0.6
0.79
A
A
A2-Sec.
mA
mA
mA
mA, p-p
100
50
3
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
Vin = 48V, full load
Vin = min., full load
88.3
88.5
Input to output, continuous
1600
91
91
%
%
Vdc
basic
10
2000
Certified to UL-60950-1, CSA-C22.2 No. 609501, IEC60950-1, 2nd edition, with AM1
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient = +25°C
MΩ
pF
Yes
Hours x 106
4.5
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
300
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
330
360
50
50
KHz
mS
mS
50
100
μSec
±75
±125
mV
0.8
15
V
V
mA
15
0.7
V
V
mA
FEATURES and OPTIONS
Remote On/Off Control ➂
“N” suffix
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix
Positive Logic, ON state
Positive Logic, OFF state
Control Current
ON = Ground pin or external voltage
OFF = Pin open or external voltage
Open collector/drain
-0.7
10
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
10
-0.7
1
1
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MDC_SPM25.A04 Page 7 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
FUNCTIONAL SPECIFICATIONS (CONT.) – MODEL SPM25-050-D48
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
Minimum
Typical/Nominal
Maximum
Units
See Derating
0.0
25
25.25
W
No trim
At 50% load, no trim
User-adjustable
Via magnetic feedback
4.95
-1
-10
6
5
5.05
1
10
7.5
Vdc
% of Vset
% of Vnom
Vdc
5
8.3
A
% of Iout
A
0.3
A
±0.1
±0.2
80
% of Vout
% of Vout
mV pk-pk
% of Vnom./°C
μF
0
98% of Vnom., after warmup
5.3
6.5
5
No minimum load
7.05
Hiccup technique, autorecovery within
±1.25% of Vout
Output shorted to ground, no damage
Continuous
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
50
±0.02
2000
MECHANICAL
Outline Dimensions
(Please refer to outline drawing)
Weight
1" x 1" x 0.41"
25.4 x 25.4 x 10.41 mm
0.69
19.56
0.04
1.016
Copper alloy
50
5
WxLxH
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
Case Material
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
ESD (Electrostatic Discharge)
See derating
No derating
Tin plated steel with black powder coat
Vin = Zero (no power)
Measured in center
External filter is required
-40
-40
-55
110
115
B
B
RoHS-6
85
105
°C
°C
125
120
°C
°C
Class
Class
Designed to meet EN61000-4-2 Perf. Criteria A
Notes
➀ Unless otherwise noted, all specifications are at nominal input voltage, nominal output voltage and full load. General conditions are +25˚ Celsius ambient temperature,
near sea level altitude, natural convection airflow. All models are tested and specified
with external parallel 1 μF and 10 μF output capacitors. The external input capacitor
is 22 μF. All capacitors are low-ESR types wired close to the converter.
➁ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth.
Input filtering is Cbus=220 μF, Cin=33 μF and Lbus=12 μH.
➂ The Remote On/Off Control is referred to -Vin.
www.murata-ps.com/support
MDC_SPM25.A04 Page 8 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
TYPICAL PERFORMANCE DATA, SPM25-050-D48
Efficiency vs. Line Voltage and Load Current @ 25°C
92
88
Efficiency (%)
84
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 75V
80
76
72
68
64
60
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Load Current (Amps)
Maximum Current Temperature Derating at sea level
Vin = 48 (air flow from J1 to J2 on PCB)
Maximum Current Temperature Derating at sea level
Vin = 36 (air flow from J1 to J2 on PCB)
6
6
5
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
4
Output Current (Amps)
Output Current (Amps)
5
3
2
1
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
4
3
2
1
0
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
Ambient Temperature (°C)
55
60
65
70
75
80
85
75
80
85
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
Vin = 60 (air flow from J1 to J2 on PCB)
Maximum Current Temperature Derating at sea level
Vin = 75 (air flow from J1 to J2 on PCB)
6
6
5
5
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
4
Output Current (Amps)
Output Current (Amps)
50
3
2
1
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
4
3
2
1
0
0
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
30
35
40
45
50
55
60
65
70
Ambient Temperature (°C)
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MDC_SPM25.A04 Page 9 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
TYPICAL PERFORMANCE DATA, SPM25-050-D48
Start-up Delay (Vin = 48V, Iout = 5A, Ta = +25°C) Ch1 = Vin, Ch4 = Vout
Enable Start-up Delay (Vin = 48V, Iout = 5A, Ta = +25°C) Ch1 = Enable, Ch4 = Vout
Output Ripple and Noise (Vin = 48V, Io = 5A, Cload = 1μF || 10μF, Ta = +25°C)
Step Load Transient Response (Vin = 48V, Vout = nom,
Iout = 100 to 50% of full load 1μF || 10μF)
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MDC_SPM25.A04 Page 10 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
FUNCTIONAL SPECIFICATIONS – MODEL SPM25-120-D48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Minimum
Typical/Nominal
Maximum
Units
Input Voltage, Continuous
0
80
Vdc
Input Voltage, Transient
100 mS max. duration
100
Vdc
Isolation Voltage
Input to output, continuous
1600
Vdc
On/Off Remote Control
Power on, referred to -Vin
0
15
Vdc
Output Power
0
25.45
W
Output Current
Current-limited, no damage, short-circuit protected
0
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 shutdown
Turn-On/Turn-Off Hysteresis
Internal Filter Type
Input current
Full Load Input Current
Low Line Input Current
Inrush Transient
Short Circuit Input Current
No Load Input Current
Shut-Down Input Current (Off, UV, OT)
Reflected (back) ripple current ➁
Pre-biased startup
Fast blow
Rising input voltage
Falling input voltage
36
48
32.8
32
34
33.5
1.5
C
Vin = nominal
Vin = minimum
0.603
0.809
0.05
50
20
1
30
Monotonic
Iout = minimum, unit=ON
Measured at input with specified filter
External output voltage < Vset
75
1.5
35
35
Vdc
A
Vdc
Vdc
Vdc
0.624
0.842
A
A
A2-Sec.
mA
mA
mA
mA, p-p
100
35
2
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
Vin = 48V, full load
Vin = min., full load
85
Input to output, continuous
1600
87
86.5
%
%
Vdc
basic
10
1700
Certified to UL-60950-1, CSA-C22.2 No. 609501, IEC60950-1, 2nd edition, with AM1
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient = +25°C
MΩ
pF
Yes
Hours x 106
5.9
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
295
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
325
10
10
355
50
50
KHz
mS
mS
100
150
μSec
±250
±350
mV
0.8
15
V
V
mA
15
0.7
V
V
mA
FEATURES and OPTIONS
Remote On/Off Control ➂
“N” suffix
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix
Positive Logic, ON state
Positive Logic, OFF state
Control Current
ON = Ground pin or external voltage
OFF = Pin open or external voltage
Open collector/drain
-0.7
10
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
10
-0.7
1
1
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MDC_SPM25.A04 Page 11 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
FUNCTIONAL SPECIFICATIONS (CONT.) – MODEL SPM25-120-D48
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 ➂
Minimum
Typical/Nominal
Maximum
Units
See Derating
0.0
25.2
25.45
W
No trim
At 50% load, no trim
User-adjustable
Via magnetic feedback
11.88
-1
-10
14
12
12.12
1
10
22
Vdc
% of Vset
% of Vnom
Vdc
0
2.1
No minimum load
3
2.1
3.4
A
% of Iout
A
0.1
A
±0.1
±0.125
120
% of Vout
% of Vout
mV pk-pk
% of Vnom./°C
μF
98% of Vnom., after warmup
2.3
19
Hiccup technique, autorecovery within
±1.25% of Vout
Output shorted to ground, no damage
Continuous
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
65
±0.02
470
MECHANICAL
Outline Dimensions
(Please refer to outline drawing)
Weight
1" x 1" x 0.41"
25.4 x 25.4 x 10.41 mm
0.69
19.56
0.04
1.016
Copper alloy
50
5
WxLxH
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
Case Material
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating
See derating
No derating
Tin plated steel with black powder coat
Vin = Zero (no power)
Measured in center
External filter is required
-40
-40
-55
110
115
B
B
RoHS-6
85
105
°C
°C
125
120
°C
°C
Class
Class
Notes
➀ Unless otherwise noted, all specifications are at nominal input voltage, nominal output voltage and full load. General conditions are +25˚ Celsius ambient temperature,
near sea level altitude, natural convection airflow. All models are tested and specified
with external parallel 1 μF and 10 μF output capacitors. The external input capacitor
is 4.7 μF. All capacitors are low-ESR types wired close to the converter.
➁ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth.
Input filtering is Cbus=220 μF, Cin=33 μF and Lbus=12 μH.
➂ The Remote On/Off Control is referred to -Vin.
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MDC_SPM25.A04 Page 12 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
TYPICAL PERFORMANCE DATA, SPM25-120-D48
Efficiency vs. Line Voltage and Load Current @ 25°C
Power Dissipation
88
4.40
86
3.90
82
Power Dissipation (Watts)
Efficiency (%)
84
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 75V
80
78
76
74
2.90
2.40
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 75V
1.90
1.40
0.90
72
70
0.18
3.40
0.37
0.56
0.75
0.94
1.13
1.32
1.51
1.70
1.89
0.40
0.2
2.1
0.4
0.6
0.7
0.9
1.1
1.3
1.5
Output Load Curre nt (Amps)
Load Current (Amps)
2.1
80
85
80
85
3
Output Current (Amps)
3
Output Current (Amps)
1.9
Maximum Current Temperature Derating at sea level
Vin = 48 (air flow from J1 to J2 on PCB)
Maximum Current Temperature Derating at sea level
Vin = 36 (air flow from J1 to J2 on PCB)
2
1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
0.5 m/s (100 LFM)
Natural Convection
1
0
2
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
1
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
Ambient Temperature (°C)
50
55
60
65
70
75
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
Vin = 60 (air flow from J1 to J2 on PCB)
Maximum Current Temperature Derating at sea level
Vin = 75 (air flow from J1 to J2 on PCB)
3
Output Current (Amps)
3
Output Current (Amps)
1.7
2
0.5 m/s (100 LFM); 1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
Natural Convection
1
0
2
1.0 m/s (200 LFM);
1.5 m/s (300 LFM); 2.0 m/s (400 LFM)
0.5 m/s (100 LFM)
Natural Convection
1
0
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
30
35
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
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MDC_SPM25.A04 Page 13 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
TYPICAL PERFORMANCE DATA, SPM25-120-D48
Start-up Delay (Vin = 48V, Iout = 2.1A, Ta = +25°C) Ch1 = Vin, Ch4 = Vout
Enable Start-up Delay (Vin = 48V, Iout = 2.1A, Ta = +25°C) Ch1 = Enable, Ch4 = Vout
Output Ripple and Noise (Vin = 48V, Io = 2.1A, Cload = 1μF || 10μF, Ta = +25°C)
Step Load Transient Response (Vin = 48V, Vout = nom,
Iout = 100 to 50% of full load 1μF || 10μF)
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MDC_SPM25.A04 Page 14 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
MECHANICAL SPECIFICATIONS
BOTTOM VIEW
SIDE VIEW
0.800
(20.32)
0.41
(10.41)
3
1
4
0.500
(12.7)
2
0.300
(7.62)
5
6
0.800
CL (20.32)
0.400
1.00 (25.4)
(10.16)
0.400
(10.16)
CL
4x 0.060-0.100
x 0.015-0.025 HIGH
NON-METALLIC
STANDOFFS (DIMPLES)
0.02 (0.508) REF
0.15
(3.81)
INSULATING
HEADER
END VIEW
PIN #1
6
2
PIN #1
INDICATOR
ISOMETRIC VIEW
5
(FOR REF ONLY)
4
INPUT/OUTPUT CONNECTIONS
1
3
TOP VIEW
MATERIAL:
.040 PINS: COPPER ALLOY
FINISH: (ALL PINS)
GOLD (5μ"MIN) OVER NICKEL (50μ" MIN)
Pin
SPM Function
(Single Output)
1
+Vin
2
-Vin
3
+Vout
4
Output Trim*
5
-Vout
6
On/Off Control*
* The Output Trim and On/Off Control
pins are optional. Also, the Remote
On/Off can be provided with either
positive (P suffix) or negative
(N suffix) logic. Please see the Part
Number Structure on Page 2.
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.
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MDC_SPM25.A04 Page 15 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
RECOMMENDED FOOTPRINT (VIEW THROUGH CONVERTER)
TOP VIEW
0.800
(20.32)
0.400
(10.16)
6
5
0.100
1.02 (25.91) MIN
COURTYARD
2
4
CL
0.400
(10.16)
0.275
(6.99)
CL
1
0.51
(12.95)
0.100
4x 0.100 'LANDING
ZONES' FOR NON-METALLIC
STANDOFFS
(KEEP FREE OF COMPS)
0.55 0.800
(13.97) (20.32)
3
0.51
(12.95)
CL
1.02 (25.91) MIN
COURTYARD
FINISHED HOLE SIZES
@ PINS 1 THRU 6
(PER IPC-D-275, LEVEL C)
0.048-0.062
STANDARD PACKAGING
EACH STATIC DISSIPATIVE
PLASTIC TUBE HOLDS 16
CONVERTERS
21.88
(555.75)
REF
0.91 (23.11) REF
16 UNITS PER TUBE
6 TUBES PER CARTON
1.16 (29.46) REF
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MDC_SPM25.A04 Page 16 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line.
The installer must observe all relevant safety standards and regulations. For
safety agency approvals, install the converter in compliance with the end-user
safety standard.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the rising input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specifications). Once operating, converters will not turn off until
the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent
restart will not occur until the input voltage rises again above the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off operation at a
single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as capacitor
inputs), the converter shuts off and then restarts as the external capacitor recharges. Such situations could oscillate. To prevent this, make sure the operating
input voltage is well above the UV Shutdown voltage AT ALL TIMES.
Start-Up Delay
Assuming that the output current is set at the rated maximum, the Vin to Vout StartUp Delay (see Specifications) is the time interval between the point when the rising
input voltage crosses the Start-Up Threshold and the fully loaded regulated output
voltage enters and remains within its specified regulation band. Actual measured
times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of the
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from inception to VOUT regulated assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified regulation
band. The specification assumes that the output is fully loaded at maximum
rated current.
Input Source Impedance
These converters will operate to specifications without external components,
assuming that the source voltage has very low impedance and reasonable input voltage regulation. Since real-world voltage sources have finite impedance,
performance is improved by adding external filter components. Sometimes only
a small ceramic capacitor is sufficient. Since it is difficult to totally characterize
all applications, some experimentation may be needed. Note that external input
capacitors must accept high speed switching currents.
Because of the switching nature of DC/DC converters, the input of these
converters must be driven from a source with both low AC impedance and
adequate DC input regulation. Performance will degrade with increasing input
inductance. Excessive input inductance may inhibit operation. The DC input
regulation specifies that the input voltage, once operating, must never degrade
below the Shut-Down Threshold under all load conditions. Be sure to use
adequate trace sizes and mount components close to the converter.
I/O Filtering, Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. External input capacitors (CIN in the figure) serve primarily as energy storage elements, minimizing
line voltage variations caused by transient IR drops in the input conductors.
Users should select input capacitors for bulk capacitance (at appropriate
frequencies), low ESR and high RMS ripple current ratings. In the figure below,
the CBUS and LBUS components simulate a typical DC voltage bus. Your specific
system configuration may require additional considerations. Please note that the
values of CIN, LBUS and CBUS may vary according to the specific converter model.
TO
OSCILLOSCOPE
VIN
+
–
+
–
CURRENT
PROBE
1
+VIN
LBUS
CBUS
CIN
2
−VIN
CIN = 33μF, ESR < 700mΩ @ 100kHz
CBUS = 220μF, ESR < 100mΩ @ 100kHz
LBUS = 12μH
Figure 2. Measuring Input Ripple Current
In critical applications, output ripple and noise (also referred to as periodic
and random deviations or PARD) may be reduced by adding filter elements
such as multiple external capacitors. Be sure to calculate component temperature rise from reflected AC current dissipated inside capacitor ESR.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating” with
respect to their input. The essential feature of such isolation is ideal ZERO
CURRENT FLOW between input and output. Real-world converters however do
exhibit tiny leakage currents between input and output (see Specifications).
These leakages consist of both an AC stray capacitance coupling component
and a DC leakage resistance. When using the isolation feature, do not allow
the isolation voltage to exceed specifications. Otherwise the converter may
be damaged. Designers will normally use the negative output (-Output) as
the ground return of the load circuit. You can however use the positive output
(+Output) as the ground return to effectively reverse the output polarity.
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MDC_SPM25.A04 Page 17 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
most applications. Sometimes it is possible to estimate the effective airflow if
you thoroughly understand the enclosure geometry, entry/exit orifice areas and
the fan flowrate specifications.
+VOUT
C1
C2
SCOPE
RLOAD
−VOUT
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple and Noise (PARD)
Minimum Output Loading Requirements
These converters employ a synchronous rectifier design topology. All models
regulate within specification and are stable from 0% load to full load conditions,
unless otherwise specified. Operation under no load will not damage the converter but might, however, slightly increase regulation, output ripple, and noise.
Thermal Shutdown
To protect against thermal over-stress, these converters include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC/
DC’s to rise above the Operating Temperature Range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit.
When the temperature decreases below the turn-on threshold, the converter
will automatically restart. There is a small amount of hysteresis to prevent
rapid on/off cycling. CAUTION: If you operate too close to the thermal limits, the
converter may shut down suddenly without warning. Be sure to thoroughly test
your application to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in the performance data section illustrate typical operation under a
variety of conditions. The Derating curves show the maximum continuous ambient
air temperature and decreasing maximum output current which is acceptable under
increasing forced airflow measured in Linear Feet per Minute (“LFM”). Note that
these are AVERAGE measurements. The converter will accept brief increases in temperature and/or current or reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Also
note that “natural convection” is defined as very low flow rates which are not
using fan-forced airflow. Depending on the application, “natural convection” is
usually about 30-65 LFM but is not equal to still air (0 LFM).
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airflow. We use both thermocouples and an
infrared camera system to observe thermal performance. As a practical matter,
it is quite difficult to insert an anemometer to precisely measure airflow in
CAUTION: If you exceed these Derating guidelines, the converter may have
an unplanned Over Temperature shut down. Also, these graphs are all collected
near Sea Level altitude. Be sure to reduce the derating for higher altitude.
Output Overvoltage Protection (OVP)
This converter monitors its output voltage for an over-voltage condition using
an on-board electronic comparator. The signal is optically coupled to the primary side PWM controller. If the output exceeds OVP limits, the sensing circuit
will power down the unit, and the output voltage will decrease. After a time-out
period, the PWM will automatically attempt to restart, causing the output voltage to ramp up to its rated value. It is not necessary to power down and reset
the converter for this automatic OVP-recovery restart.
If the fault condition persists and the output voltage climbs to excessive
levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling
is referred to as “hiccup” mode.
Output Current Limiting
As soon as the output current increases to approximately its overcurrent limit,
the DC/DC converter will enter a current-limiting mode. The output voltage will
decrease proportionally with increases in output current, thereby maintaining a
somewhat constant power output. This is commonly referred to as power limiting.
Current limiting inception is defined as the point at which full power falls
below the rated tolerance. See the Performance/Functional Specifications.
Note particularly that the output current may briefly rise above its rated value.
This enhances reliability and continued operation of your application. If the
output current is too high, the converter will enter the short circuit condition.
Output Short Circuit Condition
When a converter is in 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 PWM bias voltage will also drop,
thereby shutting down the PWM controller. Following a time-out period, the
PWM will restart, causing the output voltage to begin rising to its appropriate
value. If the short-circuit condition persists, another shutdown cycle will initiate. This on/off cycling is called “hiccup mode.” The hiccup cycling reduces the
average output current, thereby preventing excessive internal temperatures.
Trimming the Output Voltage
The Trim input to the converter allows the user to adjust the output voltage over
the rated trim range (please refer to the Specifications). In the trim equations
and circuit diagrams that follow, trim adjustments use a single fixed resistor
connected between the Trim input and either Vout pin. Trimming resistors should
have a low temperature coefficient (±100 ppm/°C or less) and be mounted close
to the converter. Keep leads short. If the trim function is not used, leave the trim
unconnected. With no trim, the converter will exhibit its specified output voltage
accuracy.
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MDC_SPM25.A04 Page 18 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
There are two CAUTIONs to observe for the Trim input:
There are two CAUTIONs for the On/Off Control:
CAUTION: To avoid unplanned power down cycles, do not exceed EITHER the
maximum output voltage OR the maximum output power when setting the trim.
If the output voltage is excessive, the OVP circuit may inadvertantly shut down
the converter. If the maximum power is exceeded, the converter may enter
current limiting. If the power is exceeded for an extended period, the converter
may overheat and encounter overtemperature shut down.
CAUTION: Be careful of external electrical noise. The Trim input is a senstive
input to the converter’s feedback control loop. Excessive electrical noise may
cause instability or oscillation. Keep external connections short to the Trim
input. Use shielding if needed.
Trim Up
12775
VO – 3.3
– 2050
RTDOWN (Ω) =
ON/OFF
CONTROL
5110 x (Vo –2.5)
3.3 – VO
12775
VO – 5
– 2050
RTDOWN (Ω) =
5 – VO
– 2050
SPM25-120-D48
25000
VO – 12
– 5110
RTDOWN (Ω) =
RTRIM DOWN
−VOUT
−VIN
5110 x (Vo –2.5)
Figure 4. Trim adjustments to decrease Output Voltage using a Fixed Resistor
+VOUT
+VIN
10000 (Vo-2.5)
12 – VO
LOAD
TRIM
– 2050
SPM25-050-D48
RTUP (Ω) =
+VOUT
Trim Down
SPM25-033-D48
RTUP (Ω) =
CAUTION: Do not apply voltages to the On/Off pin when there is no input
power voltage. Otherwise the converter may be permanently damaged.
+VIN
Trim Equations
RTUP (Ω) =
CAUTION: While it is possible to control the On/Off with external logic if you
carefully observe the voltage levels, the preferred circuit is either an open
drain/open collector transistor or a relay (which can thereupon be controlled by
logic). The On/Off prefers to be set at approx. +15V (open pin) for the ON state,
assuming positive logic.
– 5110
Where Vo = Desired output voltage. Adjustment accuracy is subject to resistor tolerances and factory-adjusted output accuracy. Mount trim resistor close
to converter. Use short leads.
Remote On/Off Control
On the input side, a remote On/Off Control can be specified with either positive
or negative logic as follows:
ON/OFF
CONTROL
TRIM
LOAD
R TRIM UP
−VIN
−VOUT
Figure 5. Trim adjustments to increase Output Voltage using a Fixed Resistor
+VCC
Positive: Models equipped with Positive Logic are enabled when the On/Off
pin is left open or is pulled high to +15VDC with respect to –VIN. An internal bias
current causes the open pin to rise to +VIN. Positive-logic devices are disabled
when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –VIN.
Negative: Models with negative logic are on (enabled) when the On/Off is
grounded or brought to within a low voltage (see Specifications) with respect to
–VIN. The device is off (disabled) when the On/Off is left open or is pulled high
to +15VDC Max. with respect to –VIN.
ON/OFF
CONTROL
-VIN
Figure 6. Driving the On/Off Control Pin (suggested circuit)
Dynamic control of the On/Off function should be able to sink the specified
signal current when brought low and withstand specified voltage when brought
high. Be aware too that there is a finite time in milliseconds (see Specifications)
between the time of On/Off Control activation and stable, regulated output. This
time will vary slightly with output load type and current and input conditions.
www.murata-ps.com/support
MDC_SPM25.A04 Page 19 of 20
SPM25 Series
Single Output Potted Metal Package
Isolated 25-Watt DC-DC Converters
Vertical Wind Tunnel
IR Transparent
optical window
Variable
speed fan
Unit under
test (UUT)
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
Heating
element
Precision
low-rate
anemometer
3” below UUT
Both through-hole and surface mount converters are
soldered down to a 10˝ X10˝ 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.
Ambient
temperature
sensor
Airflow
collimator
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 7. Vertical Wind Tunnel
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Be cautious when there is high atmospheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your production
environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
For Sn/Pb based solders:
115° C.
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
270° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
7 seconds
Maximum Solder Dwell Time
6 seconds
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 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.
© 2015 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_SPM25.A04 Page 20 of 20
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