IMS6 Series Data Sheet, 6-Watt DC-DC Converters
Input to output electric strength test up to 2 kVDC
Input voltage ranges:
18 to 36 and 36 to 75 VDC
Single and dual outputs of 5, 12, & 15 VDC
•RoHS lead-solder-exempt compliant
•Wide input voltage ranges
•Rated to Basic Isolation
•Electrical isolation, single and dual outputs
•Immunity to IEC/EN 61000-4-2, -3, -4, and -6
•High efficiency (typ. 84%)
•Flex power: flexible load distribution
•No load and short-circuit proof
•High reliability and no derating
•Operating ambient temperature –40 to +71 °C
•Industrial and alternative pinouts
• DIL 24 case with 8.5 mm profile
Safety according to IEC/EN 60950, UL 1950
Description
The IMS6 Series of board-mountable 6 Watt DC-DC
converters has been designed according to the latest
industry requirements and standards. The converters are
particularly suitable for use in mobile or stationary
applications in transport, industry or telecommunications
where variable input voltages or high transient voltages are
prevalent.
Covering a total input voltage range from 18 VDC up to
75 VDC, with single and dual outputs from 5 VDC up to
±15 VDC with flexible load distribution on dual outputs.
The converters are designed and built according to the
international safety standards IEC/EN 60950, UL 1950,
CAN/CSA C22.2 No.950-95 and are UL marked.
A special feature is their small case size, DIL 24 with only
an 8.5 mm profile. The circuit comprises integrated planar
magnetics and all components are automatically
assembled and solidly soldered onto a single PCB without
any wire connections. Thanks to the rigid mechanical
design, the converters withstand an extremely high level of
shock and vibrations. Careful considerations of possible
thermal stresses ensure the absence of hot spots providing
long life in environments where temperature cycles are a
reality. The thermal design allows operation at full load up to
an ambient temperature of 71 °C in free air without using
any potting material.
Option:- K-pinout, an alternative to the standard industrial
pinout, provides a high level of application specific
engineering and design-in flexibility.
Table of Contents Page
Description ....................................................................... 1
Model Selection ............................................................... 2
Part Number Description .................................................. 2
Functional Description ..................................................... 3
Electrical Input Data ......................................................... 4
Electrical Output Data ...................................................... 5
Page
Thermal considerations .................................................... 6
Mechanical Data .............................................................. 7
Electromagnetic Compatibility (EMC) .............................. 7
Immunity to Environmental Conditions ............................. 8
Safety and Installation Instructions .................................. 9
Description of Options .................................................... 10
32
1.25"
20
0.8"
8.5
0.34"
Features
MCD10106 Rev. 1.0, 27-FEB-09 Page 1 of 10 www.power-one.com
JUN 14, 2004 revised to JUL 27, 2006 Page 2 of 10 www.power-one.com
IMS6 Series Data Sheet, 6-Watt DC-DC Converters
Model Selection
Table 1: Model Selection
Output 1 Output 2 Output Power Input voltage Efficiency Type Options2
U
o1 nom
I
o1 nom
U
o2 nom
I
o2 nom
P
o nom range ηtyp designation
[VDC] [A] 1 [VDC] [A] 1 [W] [VDC] [%]
5 1000 - - 5.0 18...36 82 24IMS6-05-9
5 1000 - - 5.0 36...75 82 48IMS6-05-9 Z
12 500 - - 6.0 18...36 83 24IMS6-12-9
12 500 - - 6.0 36...75 83 48IMS6-12-9
15 400 - - 6.0 18...36 84 24IMS6-15-9
15 400 - - 6.0 36...75 84 48IMS6-15-9
+5 500 –5 500 5.0 18...36 82 24IMS6-0505-9
+5 500 –5 500 5.0 36...75 82 48IMS6-0505-9
+12 250 –12 250 6.0 18...36 83 24IMS6-1212-9
+12 250 –12 250 6.0 36...75 83 48IMS6-1212-9 Z
+15 200 –15 200 6.0 18...36 84 24IMS6-1515-9
+15 200 –15 200 6.0 36...75 84 48IMS6-1515-9
1Flexible load distribution on double outputs possible.
2Not all -K/-Z options exist, to check if option exists and/orfor minimum quantity and lead time contact Power-One.
Part Number Description
24 IMS 6 - 12 12 -9 K Z
Input voltage range
V
i
18 to 36 VDC ............................................. 24
36 to 75 VDC ............................................. 48
Series ......................................................................... IMS6
Output voltage type for output 1 ......................... 05, 12, 15
Output voltage type for output 2 ......................... 05, 12, 15
Operating ambient temperature range
T
A
–40 to 71 °C ................................................ -9
Options: Alternative pinout (check availability) .......... K
Open frame .................................................. Z
Examples: 48IMS6-1212-9Z: DC-DC converter, input voltage range 36 to 75V, 2 outputs providing ±12 V, 250 mA,
temperature range –40 to 71 °C, no case.
IMS6 Series Data Sheet, 6-Watt DC-DC Converters
Functional Description
The IMS6 DC-DC converters are feedback controlled
flyback converters using current mode PWM (Pulse Width
Modulation).
The converter input is protected against transients by
means of a suppressor diode.
The output voltage is monitored by a separate transformer
winding close to the secondary windings and fed back to
the control circuit.
Fig. 2
Block diagram for dual output types.
Standard industrial pinout.
Fig. 1
Block diagram for single output types.
Standard industrial pinout.
Fig. 4
Block diagram for dual output types.
Special pinout (option K).
Fig. 3
Block diagram for single output types.
Special pinout (option K).
Current limitation is provided by the primary circuit, thus
limiting the total output current (
I
o nom for the single and
I
o1 nom +
I
o2 nom for the dual output types).
The close magnetic coupling provided by the planar
construction ensures very good regulation and allows for
flexible load distribution on dual output types.
PWM
Vi+
Vi–
Vo+
Vo–
22
3
14
16
10
23
2
03044
PWM
Vi+
Vi–
Vo+
Vo–
Go
23
22
2
3
14
16
11
03045
PWM
Vi+
Vi–
Vo+
Vo–
1
24
13
12
2
03046
n.c.
PWM
Vi+
Vi–
Vo+
Vo–
Go
1
24
15
10
13
03047
11
MCD10106 Rev. 1.0, 27-FEB-09 Page 3 of 10 www.power-one.com
IMS6 Series Data Sheet, 6-Watt DC-DC Converters
Electrical Input Data
General conditions:
T
A = 25 °C, unless
T
C is specified.
Table 2: Input Data
6SMI84 6SMI42 tupnI
imsnoitidnoCscitsiretcarahC n typ max min typ max Unit
V
iInput voltage range
T
C min to
T
C max 18 36 36 75 V DC
V
i nom Nominal input voltage
I
o = 0 to
I
o nom 8442
V
i sur 00104)s 3( tupni xam .sbaegatlov egrus evititepeR
t
start up Converter start-up time 1 Worst case condition at 0.25 0.5 0.25 0.5 s
V
i min and full load
t
rise Rise time 1
V
i nom sm55daol evitsiser
I
o nom 2121daol eviticapac
I
i o No load input current
I
o = 0,
V
i min to
V
i max 15 20 5 10 mA
C
i3.045.0noitaluclac egrus rofecnaticapac tupnI µF
I
inr p Inrush peak current
V
i =
V
i nom 3 A2.47.3
f
sSwitching frequency
V
i min...
V
i max,
I
o= 0...
I
o nom approx. 400 approx. 400 kHz
I
i rr Reflected ripple current
I
o = 0 to
I
o nom Am0303 pp
V
i RFI Input RFI level EN 55022 2 BB
conducted and radiated
1Measured with a resistive or max. admissible capacitive load. (See fig.:
Converter start-up and rise time
)
2External filter required. (See:
Filter recommendations for compliance with EN standards
)
3Source impedance according to prETS 300132-2, version 4.3.
Table 3: Input filter components (EN 55022)
Ref. 24IMS6 48IMS6
C14.7 µF,63 V, 2.2 µF,100 V,
85°C 85°C
mlif ro cimarecepyT
Fig. 5
Converter start-up and rise time
Inrush Current
The inrush current has been kept as low as possible by
choosing a very small input capacitance. A series resistor
may be inserted in the input line to limit this current further.
Fig. 6
Typical inrush current at U
i nom
, P
o nom
versus time meas-
ured according to prETS 300132-2, version 4.3.
Reverse Polarity Protection at Input
The suppressor diode on the input also provides for reverse
polarity protection by conducting current in the reverse
direction, thus protecting the unit. An external fuse is
required to limit this current:
– For 24IMS6 a fast 1 A (F1A) fuse is recommended
– For 48IMS6 a fast 0.63 A (F0.63A) fuse is recommended
Filter recommendations for compliance with EN 55022
Electromagnetic emission requirements according to table
Input data
can be achieved by adding an external capacitor
as close as possible to the input terminals.
Fig. 7
Input filter arrangement
V
o nom
V
o
t
start up
t
rise
t
04008
1 A/Div.
5µs/Div.
04034
0
1
2
3
4
Vi+
Vi–
C
i
04035
MCD10106 Rev. 1.0, 27-FEB-09 Page 1 of 10 www.power-one.com
MCD10106 Rev. 1.0, 27-FEB-09 Page 4 of 10 www.power-one.com
IMS6 Series Data Sheet, 6-Watt DC-DC Converters
Table 4b: Output data for dual output units
Output
V
o nom ±5 V ±12 V ±15 V
Characteristics Conditions min typ max min typ max min typ max Unit
V
o1 Output voltage
V
i nom 4.96 5.04 11.90 12.10 14.88 15.12 VDC
V
o2
I
o1 =
I
o2 = 0.5
I
o nom 4.95 5.05 11.88 12.12 14.85 15.15
I
o nom Output current 1
V
i min...
V
i max 2 x 500 2 x 250 2 x 200 mA
P
o L Power limit 2 3
V
i nom,
T
C = 25°C 2 x 3.5 2 x 4.0 2 x 4.2 W
∆
V
o U Line regulation
V
i min...
V
i max,
I
o nom %1±1±1±
∆
V
Load regulation 4
V
i nom ±3 ±3.5 ±3
I
o = (0.1...1)
I
o nom
V
o1, 2 Output voltage noise
V
i min...
V
i max 5100 140 150 mVpp
I
o =
I
o nom 640 60 45 70 50 75
V
o clp %031031031%1 daol .niMegatlovrevo tuptuO
limitation
C
o ext 001051086elbissimdA µF
capacitive load 3
V
o d Dynamic Voltage deviat.
V
i nom ±250 ±600 ±750 mV
t
dload Recovery time
I
o nom ×1/2
I
o nom 1 1 1 ms
regulat.
αVo Temperature coefficient
V
i min to
V
i max ±0.02 ±0.02 ±0.02 %/K
∆
U
o/∆
T
C
I
o = 0 to
I
o nom
1Each output capable of delivering full output power.
2The current limit is primary side controlled.
3Sum of both outputs.
4Conditions for specified output. Other output loaded with constant current
I
o = 0.5
I
o nom.
5BW = 20 MHz.
6Measured with a probe according to EN 61204.
Electrical Output Data
General conditions:
T
A = 25°C, unless
T
C is specified.
Table 4a: Output data for single output units
Output
V
o nom 5 V 12 V 15 V
Characteristics Conditions min typ max min typ max min typ max Unit
V
oOutput voltage
V
i nom,
I
o = 0.5
I
o nom 4.96 5.04 11.90 12.10 14.88 15.12 VDC
I
o nom Output current
V
i min to
V
i max 1000 500 400 mA
I
o L Current limit 2
V
i nom,
T
C = 25°C 1400 700 600
∆
V
o U Line regulation
V
i min...
V
i max,
I
o nom %1±1±1±
∆
V
Load regulation
V
i nom 3±3±3±
I
o = (0.1...1)
I
o nom
V
o1, 2 Output voltage noise
V
i min to
V
i max 80 120 150 mVpp
I
o =
I
o nom 20 40 40 60 50 75
V
o clp %031031031%1 daol .niMegatlovrevo tuptuO
limitation
C
o ext 001051086elbissimdA µF
capacitive load 3
V
o d Dynamic Voltage deviat.
V
i nom ±250 ±250 ±250 mV
t
dload Recovery time
I
o nom × 1/2
I
o nom sm111
regulat.
αVo Temperature coefficient
V
i min to
V
i max ±0.02 ±0.02 ±0.02 %/K
∆
V
o/∆
T
C
I
o = 0 to
I
o nom
MCD10106 Rev. 1.0, 27-FEB-09 Page 5 of 10 www.power-one.com
IMS6 Series Data Sheet, 6-Watt DC-DC Converters
Thermal Considerations
If a converter, mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the indicated
maximum ambient temperature
T
A max (see table:
Temperature specifications)
and is operated at its nominal
input voltage and output power, the case temperature
T
C
measured at the:
Measuring point of case temperature T
C
(see:
Mechanical Data
) will approach the indicated value
T
C max after the warm-up phase. However, the relationship
between
T
A and
T
C depends heavily on the conditions of
operation and integration into a system. The thermal
conditions are influenced by input voltage, output current,
airflow, temperature of surrounding components and
surfaces and the properties of the printed circuit board.
T
A
max is therefore only an indicative value and under practical
operating conditions, the ambient temperature
T
A may be
higher or lower than this value.
Caution: The case temperature
T
C measured at the
Measuring point of case temperature T
C(see:
Mechanical Data
) may under no circumstances exceed
the specified maximum value. The installer must ensure
that under all operating conditions
T
C remains within the
limits stated in the table:
Temperature specifications.
Typical Performance Curves
Output overvoltage protection
The outputs of the IMS6 converters are protected against
overvoltages by Zener diodes. In the event of an
overvoltage on the output, the unit will shut down and
attempt to restart automatically. The main purpose of this
feature is to protect against possible overvoltages which
could occur due to a failure in the feedback control circuit.
The converters are not designed to withstand external
overvoltages applied to the outputs.
Connection in series
The outputs of single or dual output units can be connected
in series without any precautions, taking into consideration
that the highest output voltage should remain below 60 V for
SELV operation.
Connection in parallel
The outputs of several units with equal nominal output
voltage can be connected in parallel. Approximate current
sharing between 2 or several units is ensured by their load
dependent output characteristic.
Short Circuit Behavior
The current limit characteristic shuts down the converter
whenever a short circuit is applied to its output. It acts self-
protecting and automatically recovers after removal of the
overload condition.
Fig. 8
U
o
versus I
o
(typ) of single output units
(example for 48IMS6-05-9)
Fig. 9
U
o
versus I
o
(typ) of dual output units (±15 V), with 30 V
load connected to Vo+ and Vo–.
Fig. 10
Cross load regulation of dual output units. U
o1
versus
I
o1
(typ) for various I
o2
(48IMS6-1515-9).
Fig. 11
Flexible load distribution on dual outputs (2
x
12 V) with
load variation from 0 to 150% of P
o1 nom
on output 1.
Output 2 loaded with 25% of P
o2 nom
.
5.25
5.0
4.75
4.5
4.25
4.0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 I
o
[A]
V
o
[V]
05056
28.5
29
29.5
30
30.5
31
31.5
Vo1 +Vo2 [V]
20 40 60 80 100 120 140 Io [mA]
0
05057
14
14.5
15
15.5
16
16.5
Vo1 [V]
20 40 60 80 100 120 140 Io1 [mA]
0
Io2 = 140 mA
Io2 = 14 mA
05058
Vo1,Vo2 [V]
Io1
Io1 no
05059
12.8
12.4
12
11.6
11.2 0 30 60 90 120 150 [%]
Vo2
Vo1
MCD10106 Rev. 1.0, 27-FEB-09 Page 6 of 10 www.power-one.com
IMS6 Series Data Sheet, 6-Watt DC-DC Converters
EN 55022 B
50
40
30
20
10
0
30
50
100
200
500
1000
Fre
q
uenc
y [
MHz
]
[dBµV/m]
07034
Fig. 12
Overload switch-off (hiccup mode).
Frequency of pulses: 16.5 Hz, puls duration: 8.5 ms.
Fig. 13
Efficiency versus input voltage and load.
Typical values (48 IMS 6-1212-9).
Mechanical Data
Dimensions in mm. Tolerances ±0.3 mm unless otherwise indicated.
Fig. 16
Standard or alternative pinout
Weight: <10 g
Fig. 17
Open frame (Option Z)
Weight: <10 g
Fig. 14
Typical disturbance voltage (quasi-peak) at the input ac-
cording to CISPR 11/EN 55011 and CISPR 22/EN 55022,
measured at U
i nom
and I
o nom
. Output leads 0.1 m, twisted.
External capacitor at the input required (see: Recommen-
dations for compliance with EN 55022) (48IMS6-1515-9).
Fig. 15
Typical radio frequency interference voltage at U
i nom
,
I
o nom
, measured with an antenna (distance 10 m). Output
leads 0.1 m, twisted (48IMS6-1515-9).
Electromagnetic Emission
Conducted RFI noise at input according to EN 55022 Radiated RFI noise according to EN 55022.
70
100
Vo [%]
t [ms]
05041
8.5
60.5
60.5
overload short circuit condition
switch-off
40
50
60
70
80
90
η
[%]
05060
25 50 75 100
Po1
Po nom
[%]
Vi nom
Vi max
Vi min
07033
EN 55022 A
EN 55022 B
90
80
70
60
50
40
30
20
10
0
0.01
0.05
0.1
0.5
1
2
5
10
20
30
[dBµV]
MH
z
0.02
33 (1.3")
1
20 (0.79")
121
13 24
11 x 2.54 (0.1")
S09042
15.24 (0.6")
8.5
(0.33")
0.5 (0.02")
3 (0.12")
Measuring point
of case temperature T
C
31 (1.22")
1
20 (0.79")
12
13 24
11 x 2.54 (0.1")
S90004
8.5
(0.33")
0.5 (0.02")
3 (0.12")
15.24 (0.6")
European
Projection
MCD10106 Rev. 1.0, 27-FEB-09 Page 7 of 10 www.power-one.com
IMS6 Series Data Sheet, 6-Watt DC-DC Converters
Immunity to Environmental Conditions
Table 5: Environmental testing
sutatSsnoitidnoC tseTdradnatSdohteM tseT
Ca Damp heat IEC/DIN IEC 60068-2-3 Temperature: 40 ±2 ton tinUC°
steady state MIL-STD-810D section 507.2 Relative humidity: 93 +2/-3 gnitarepo%
Duration: 56 days
Ea Shock IEC/EN/DIN EN 60068-2-27 Acceleration amplitude: 100 gn = 981 m/s2Unit
gnitareposm 6:noitarud pmuB3.615 noitces D018-DTS-LIM)ladiosunis-flah(
Number of bumps: 18 (3 each direction)
Eb Bump IEC/EN/DIN EN 60068-2-29 Acceleration amplitude: 40 gn = 392 m/s2Unit
gnitareposm 6:noitarud pmuB3.615 noitces D018-DTS-LIM)ladiosunis-flah(
Number of bumps: 6000 (1000 each direction)
Fc Vibration IEC/EN/DIN EN 60068-2-6 Acceleration amplitude: 0.35 mm (10 to 60 Hz) Unit
g 5)ladiosunis( n = 49 m/s2 (60...2000 Hz) operating
Frequency (1 Oct/min): 10 to 2000 Hz
Test duration: 7.5 h (2.5 h each axis)
Fh Vibration, IEC/EN 60068-2-64 Acceleration spectral density: 0.05 gn2/Hz Unit
broad-band DIN 40046 part 23 Frequency band: 10...500 Hz operating
random MIL-STD-810D section 514.3 Acceleration magnitude: 4.9 gn rms
)sixa hcae h 1( h 3:noitarud tseT)lortnoc latigid(
Kb Salt mist, cyclic IEC/EN/DIN IEC 60068-2-52 Concentration: 5% (30 °C) Unit not
gnitarepoelcyc rep h 2:noitaruDedirolhc muidos(
ytidimuh .ler %39 ,C°04:egarotS)noitulos lCaN
Storage duration: 22 h per cycle
Number of cycles: 3
Table 6: Temperature specifications, valid for air pressure of 800 to 1200 hPa (800 to 1200 mbar)
Temperature Standard -9
tinUxamnimsnoitidnoCscitsiretcarahC
T
AAmbient temperature 1 Operational 2 C°1704–
T
C5904–erutarepmet esaC
T
SStorage temperature 1 00104–lanoitarepo noN
1MIL-STD-810D section 501.2 and 502.2
2See
Thermal Considerations
Table 7: MTBF and device hours
eliboM dnuorGdexiF dnuorGngineB dnuorGFBTM
MTBF acc. to MIL-HDBK-217F
T
C = 40 °C
T
C = 40 °C
T
C = 70 °C
T
C = 50 °C
h 000'911h 000'421h 000'943h 000'156'29-50-6SMI84
MCD10106 Rev. 1.0, 27-FEB-09 Page 8 of 10 www.power-one.com
IMS6 Series Data Sheet, 6-Watt DC-DC Converters
Table 9: Pin allocation for K pinout (option K)
Pin Single output units Dual output units
+iV+iV1
-.c.n2
oG-01
oG-11
-–oV21
–oV+oV31
+oV-51
–iV–iV42
Safety and Installation Instructions
Installation Instruction
Installation of the DC-DC converters must strictly follow the
national safety regulations in compliance with the
enclosure, mounting, creepage, clearance, casualty,
markings and segregation requirements of the end-use
application.
Connection to the system shall be made via a printed circuit
board according to:
Mechanical Data
.
The units should be connected to a secondary circuit.
Check for hazardous voltages before altering any
connections.
Do not open the module.
Ensure that a unit failure (e.g. by an internal short-circuit)
does not result in a hazardous condition. See also:
Safety of
operator accessible output circuit.
Fig. 18
Pin numbering
Input Fuse
To prevent excessive current flowing through the input
supply line in case of a short-circuit across the converter
input an external fuse should be installed in a non-earthed
input supply line. We recommend a fast acting fuse F1A for
24IMS6 and F0.5A for 48IMS6 models.
Safety of operator accessible output circuits
If the output circuit of a DC-DC converter is operator
accessible, it shall be an SELV circuit according to IEC/EN
60950 related safety standards
The insulation concept table below shows some possible
installation configurations, compliance with which causes
the output circuit of the DC-DC converter to be an SELV
circuit according to IEC/EN 60950 up to a configured output
voltage (sum of nominal voltages if in series or +/–
configuration) of 46 V.
However, it is the sole responsibility of the installer to
ensure the compliance with the relevant and applicable
safety regulations. More information is given in:
Technical
Information: Safety
.
Standards and approvals
All DC-DC converters are UL recognized according to UL
1950, UL recognized for Canada to CAN/CSA C22.2 No.
950-95 and LGA approved to IEC/EN 60950 standards.
The units have been evaluated for:
• Building in
• Basic insulation input to output, based on their maximum
input voltage
• The use in a pollution degree 2 environment
• Connecting the input to a secondary circuit which is
subject to a maximum transient rating of 1500 V for
IMS 6.
The DC-DC converters are subject to manufacturing
surveillance in accordance with the above mentioned UL,
CSA, EN and ISO 9001 standards.
Table 8: Pin allocation for standard industrial pinout
Pin Single output units Dual output units
–iV–iV2
–iV–iV3
-.c.n01
–oV-11
+oV+oV41
oG–oV61
+iV+iV22
+iV+iV32
1
12
13 24
10013
Bottom view
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical
components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express
written consent of the respective divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending
on the date manufactured. Specifications are subject to change without notice.
MCD10106 Rev. 1.0, 27-FEB-09 Page 9 of 10 www.power-one.com
IMS6 Series Data Sheet, 6-Watt DC-DC Converters
Description of Options
Table 12: Survey of options
Option Function of citsiretcarahCnoitpo
ytilibaliava rof yrotcaf tcatnoCtuonip evitanretlAK
esac tuohtiw elbaliava era sledom llAemarf nepOZ
Table 11: Insulation concept leading to an SELV output circuit
Conditions Fr tluseRretrevnoc CD-CDdne tno
Supply Minimum required grade Maximum Minimum required safety Measures to achieve the Safety status of
voltage of isolation, to be provided DC output status of the front end specified safety status of the the DC-DC
by the AC-DC front end, voltage output circuit output circuit converter output
tiucriceht morfdeilppus sniam gnidulcni
battery charger front end 1
Mains Basic <60 V Earthed SELV circuit 2 Operational insulation, pro- SELV circuit
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ELV circuit Input fuse 3 output suppressor Earthed SELV
>60 V Hazardous voltage diodes 4, and earthed circuit
secondary circuit output circuit 2
Double or reinforced <60 V SELV circuit Operational insulation, pro- SELV circuit
vided by the DC-DC converter
>60 V TNV-2 circuit Basic insulation, based on the
Double or reinforced insu- maximum input voltage, pro-
lated unearthed hazardous vided by the DC-DC converter
voltage secondary circuit 5
1The front end output voltage should match the specified input voltage range of the DC-DC converter.
2The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950.
3The installer shall provide an approved fuse (type with the lowest rating suitable for the application) in a non-earthed input line directly
at the input of the DC-DC converter (see fig.:
Schematic safety concept
). For UL’s purpose, the fuse needs to be UL-listed. See also:
Input Fuse
.
4Each suppressor diode should be dimensioned in such a way, that in the case of an insulation fault the diode is able to limit the output
voltage to SELV (<60 V) until the input fuse blows (see fig.:
Schematic safety concept
).
5Has to be insulated from earth by double or reinforced insulation according to the relevant safety standard, based on the maximum
output voltage from the front end.
Table 10: Electric strength test voltages
Characteristic Input - Output Unit
IMS6
Electric strength 1.2 kVrms
test voltage 1 s 1.5 kV DC
Fn2.1gnilpuoC
capacitance
Insulation resist. >100 MΩ
at 500 V DC
Partial discharge Consult factory kV
extinction voltage
Fig. 19
Schematic safety concept. Use fuse, suppressor diode
and earth connection as per table:
Safety concept leading
to an SELV output circuit
.
Cleaning Agents
In order to avoid possible damage, any penetration of
cleaning fluids has to be prevented, since the power
supplies are not hermetically sealed.
Protection Degree
The protection degree of the DC-DC converters is IP 30.
Isolation
The electric strength test is performed as factory test in
accordance with IEC/EN 60950 and UL 1950 and should
not be repeated in the field. Power-One will not honor any
warranty claims resulting from electric strength field tests.
AC-DC
front
end
DC-DC
con-
verter
Mains
Fuse
Battery
Earth
connection
Suppressor
diode SELV
Earth
connection
+
–
~
~
10004
MCD10106 Rev. 1.0, 27-FEB-09 Page 10 of 10 www.power-one.com
