IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 1 of 10
Input to output electric strength test up to 2 KV DC
Input voltage ranges:-
18...36 and 36..75 VDC
Single and dual outputs of 5, 12 & 15 VDC
•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
Summary
The IMS6 series of board mountable 6 Watt DC-DC con-
verters has been designed according to the latest industry
requirements and standards. The converters are particu-
larly 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 V DC up to
75 V DC, with single and dual outputs from 5 V DC up to
±15 V DC 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 LGA and UL marked.
A special feature is their small case size, DIL 24 with only
8.5 mm profile. The circuit comprises integrated planar
magnetics and all components are automatically assem-
bled and solidly soldered onto a single PCB without any
wire connections. Thanks to the rigid mechanical design
the units withst and an extremely high level of shock and vi-
brations. 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 engi-
neering and design-in flexibility.
Table of Contents Page
Summary.......................................................................... 1
Type Survey and Key Data .............................................. 2
Type Key .......................................................................... 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 ................................................... 1 0
32
1.25"
20
0.8"
8.5
0.34"
LGA
IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 2 of 10
Type Survey and Key Dat a
Table 1: Type survey
Output 1 Output 2 Output Power Input voltage Efficiency Type Options2
Uo1 nom Io1 nom Uo2 nom Io2 nom Po nom range ηtyp designation
[V DC] [A] 1 [V DC] [A] 1 [W] [V DC] [% ]
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.
Type Key 24 IMS 6 - 12 12 -9 K Z
Input voltage range Ui
18...36 V DC .............................................. 24
36...75 V DC .............................................. 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 TA
–40...71°C ..................................................-9
Options: Alternative pinout (check availability) ..........K
Open frame.................................................. Z
Examples: 48IMS6-1212-9Z: DC-DC converter, input voltage range 36...75 V, 2 outputs providing ±12 V, 250 mA,
temperature range –40...71°C, no case.
Model numbers highlighted in yellow or shaded are not recommended for new designs.
IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 3 of 10
Functional Description
The IMS6 DC-DC modules are feedback controlled flyback
converters using current mode PWM (Pulse Width Modula-
tion).
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.
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
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 (Io nom for the single and
Io1 nom + Io2 nom for the dual output types).
The close magnetic coupling provided by the planar con-
struction ensures very good regulation and allows for flex-
ible load distribution on dual output types.
IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 4 of 10
Electrical Input Data
General conditions: TA = 25°C, unless TC is specified.
Table 2: Input Data
Input 24IMS6 48IMS6
Characteristics Conditions min typ max min typ max Unit
UiInput voltage range TC min...TC max 18 36 36 75 V DC
Ui nom Nominal input voltage Io = 0...Io nom 24 48
Ui sur Repetitive surge voltage abs. max input (3 s) 40 100
tstart up Converter start-up time 1 Worst case condition at 0.25 0.5 0.25 0.5 s
Ui min and full load
trise Rise time 1 Ui nom resistive load 5 5 ms
Io nom capacitive load 12 12
Ii o No load input current Io = 0, Ui min...Ui max 15 20 5 10 mA
CiInput capacitance for surge calculation 0.54 0.3 µF
Iinr p Inrush peak current Ui = Ui nom 3 3.7 4.2 A
fsSwitching frequency Ui min...Ui max, Io = 0... Io nom approx. 400 approx. 400 kHz
Ii rr Reflected ripple current Io = 0...Io nom 30 30 mApp
ui 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.
U
o nom
U
o
t
start up
t
rise
t
04008
Fig. 5
Converter start-up and rise time
1
A/Div.
5 µs/Div.
04034
0
1
2
3
4
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 Ui nom, Po 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 re-
verse polarity protection by conducting current in the re-
verse 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 cap acitor
as close as possible to the input terminals.
Fig. 7
Input filter arrangement
Vi+
Vi–
C
i
0403
5
Table 3: Input filter components (EN 55022)
Ref. 24IMS6 48IMS6
C14.7 µF, 63 V, 2.2 µF, 100 V,
85°C 85°C
Type ceramic or film
IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 5 of 10
Electrical Output Data
General conditions: TA = 25°C, unless TC is specified.
Table 4a: Output data for single output units
Output Uo nom 5.0 V 12.0 V 15.0 V
Characteristics Conditions min typ max min typ max min typ max Unit
UoOutput voltage Ui nom, Io = 0.5 Io nom 4.96 5.04 11.90 12.10 14.88 15.12 VDC
Io nom Output current Ui min...Ui max 1000 500 400 mA
Io L Current limit 2Ui nom, TC = 25°C 1400 700 600
∆Uo U Line regulation Ui min...Ui max, Io nom ±1 ±1 ±1 %
∆ULoad regulation Ui nom ±3 ±3 ±3
Io = (0.1...1) Io nom
uo1, 2 Output voltage noise Ui min...Ui max 80 120 150 mVpp
Io = Io nom 20 40 40 60 50 75
Uo clp Output overvoltage Min. load 1% 130 130 130 %
limitation
Co ext Admissible 680 150 100 µF
capacitive load 3
uo d Dynamic Voltage deviat. Ui nom ±250 ±250 ±250 mV
tdload Recovery time Io nom × 1/2 Io nom 11 1ms
regulat.
αUo Temperature coefficient Ui min...Ui max ±0.02 ±0.02 ±0.02 %/K
∆Uo/∆ TCIo = 0...Io nom
Table 4b: Output data for dual output units
Output Uo nom ±5 V ±12 V ±15 V
Characteristics Conditions min typ max min typ max min typ max Unit
Uo1 Output voltage Ui nom 4.96 5.04 11.90 12.10 14.88 15.12 VDC
Uo2 Io1 = Io2 = 0.5 Io nom 4.95 5.05 11.88 12.12 14.85 15.15
Io nom Output current 1 Ui min...Ui max 2 x 500 2 x 250 2 x 200 mA
Po L Power limit 2 3 Ui nom, TC = 25°C 2 x 3.5 2 x 4.0 2 x 4.2 W
∆Uo U Line regulation Ui min...Ui max, Io nom ±1 ±1 ±1 %
∆ULoad regulation 4 Ui nom ±3 ±3.5 ±3
Io = (0.1...1) Io nom
uo1, 2 Output voltage noise Ui min...Ui max 5100 140 150 mVpp
Io = Io nom 640 60 45 70 50 75
Uo clp Output overvoltage Min. load 1% 130 130 130 %
limitation
Co ext Admissible 680 150 100 µF
capacitive load 3
uo d Dynamic Voltage deviat. Ui nom ±250 ±600 ±750 mV
tdload Recovery time Io nom × 1/2 Io nom 11 1ms
regulat.
αUo Temperature coefficient Ui min...Ui max ±0.02 ±0.02 ±0.02 %/K
∆Uo/∆ TCIo = 0...Io 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 Io = 0.5 Io nom.
5BW = 20 MHz.
6Measured with a probe according to EN 61204.
IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 6 of 10
Output overvoltage protection
The outputs of the IMS6 converters are protected against
overvoltages by Zener diodes. In the event of an overvolt-
age 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 units 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 60V
for SELV operation.
Connection in parallel
The outputs of several unit s with equal nominal output volt-
age can be connected in parallel. Approximate current
sharing between 2 or several units is ensured by their load
dependent output characteristic.
Short Circuit Behaviour
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
Uo versus Io (typ) of single output units
(example for 48IMS6-05-9)
Fig. 9
Uo versus Io (typ) of dual output units (±15 V), with 30 V
load connected to Vo+ and Vo–.
5
.25
5.0
4
.75
4.5
4
.25
4.0 0 0.1 0.2 0.3 0.4 0.6 0.8 1.0 1.2 1.4 1.6
I
o
[A]
U
o
[V]
05056
2
8.5
29
2
9.5
30
3
0.5
31
3
1.5
U
o1
+ U
o2
[V]
20 40 60 80 120 160 200 I
o
[mA]
0
05057
14
1
4.5
15
1
5.5
16
1
6.5
Uo1 [V]
20 40 60 80 120 160 200 Io1 [mA]
0
I
o2
= 200 mA
I
o2
= 20 mA
05058
Uo1, Uo2 [V]
Io1
Io1 no
05059
1
2.8
2.4
12
1.6
1.2 030
60 90 120 150 [%
Uo2
Uo1
Thermal Considerations
If a converter , mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the indicated maxi-
mum ambient temperature TA max (see table: Temperature
specifications) and is operated at its nominal input voltage
and output power, the case temperature TC measured at
the: Measuring point of case temperature TC (see: Me-
chanical Data) will approach the indicated value TC max af-
ter the warm-up phase. However , the relationship between
TA and TC depends heavily on the conditions of operation
and integration into a system. The thermal conditions are
influenced by input voltage, output current, airflow, tem-
perature of surrounding components and surfaces and the
properties of the printed circuit board. TA max is therefore
only an indicative value and under practical operating con-
ditions, the ambient temperature TA may be higher or lower
than this value.
Caution: The case temperature TC measured at the
Measuring point of case temperature TC (see: Mechani-
cal Data) may under no circumstances exceed the speci-
fied maximum value. The installer must ensure that un-
der all operating conditions TC remains within the limits
stated in the table: Temperature specifications.
Typical Performance Curves
Fig. 10
Cross load regulation of dual output units. Uo1 versus
Io1 (typ) for various Io2 (48IMS6-1515-9).
Fig. 11
Flexible load distribution on dual outputs (2 x 12 V) with
load variation from 0...150% of Po1 nom on output 1.
Output 2 loaded with 25% of Po2 nom.
IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 7 of 10
70
1
00
Uo [%]
t [m
s]
0504
1
8.5
60.5
60.5
overload short circuit condition
switch-off
40
50
60
70
80
90
η [%]
05060
25 50 75 100 P
o1
P
o nom
[%
]
U
i nom
U
i max
U
i min
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
33 (1.3")
1
20 (0.79")
12 1
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 TC
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")
Fig. 17
Open frame (Option Z)
Weight: <10 g
European
Projection
Fig. 14
Typical disturbance voltage (quasi-peak) at the input ac-
cording to CISPR 11/EN 55011 and CISPR 22/EN 55022,
measured at Ui nom and Io 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 Ui nom,
Io nom, measured with an antenna (distance 10 m). Output
leads 0.1 m, twisted (48IMS6-1515-9).
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
EN 55022 B
50
40
30
20
10
0
30
50
100
200
500
1000
Frequency [MHz]
[
dBµV/m]
07034
Electromagnetic Emission
Conducted RFI noise at input according to EN 55022 Radiated RFI noise according to EN 55022.
IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 8 of 10
Immunity to Environment al Conditions
Table 5: Environmental testing
Test Method Standard Test Conditions Status
Ca Damp heat IEC/DIN IEC 60068-2-3 Temperature: 40 ±2 °C Unit not
steady state MIL-STD-810D section 507.2 Relative humidity: 93 +2/-3 % operating
Duration: 56 days
Ea Shock IEC/EN/DIN EN 60068-2-27 Acceleration amplitude: 100 gn = 981 m/s2Unit
(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 6 ms operating
Number of bumps: 18 (3 each direction)
Eb Bump IEC/EN/DIN EN 60068-2-29 Acceleration amplitude: 40 gn = 392 m/s2Unit
(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 6 ms operating
Number of bumps: 6000 (1000 each direction)
Fc Vibration IEC/EN/DIN EN 60068-2-6 Acceleration amplitude: 0.35 mm (10...60 Hz) Unit
(sinusoidal) 5 gn = 49 m/s2 (60...2000 Hz) operating
Frequency (1 Oct/min): 10...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
(digital control) Test duration: 3 h (1 h each axis)
Kb Salt mist, cyclic IEC/EN/DIN IEC 60068-2-52 Concentration: 5% (30°C) Unit not
(sodium chloride Duration: 2 h per cycle operating
NaCl solution) Storage: 40°C, 93% rel. humidity
Storage duration: 22 h per cycle
Number of cycles: 3
Table 6: Temperature specifications, valid for air pressure of 800...1200 hPa (800...1200 mbar)
Temperature Standard -9
Characteristics Conditions min max Unit
TAAmbient temperature 1 Operational 2 –40 71 °C
TCCase temperature –40 95
TSStorage temperature 1 Non operational – 4 0 100
1MIL-STD-810D section 501.2 and 502.2
2See Thermal Considerations
Table 7: MTBF and device hours
MTBF Ground Benign Ground Fixed Ground Mobile
MTBF acc. to MIL-HDBK-217F TC = 40 °C TC = 40 °C TC = 70°C TC = 50 °C
48IMS6-05-9 2'651'000 h 349'000 h 124'000 h 119'000 h
IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 9 of 10
Safety and Installation Instructions
Installation Instruction
Installation of the DC-DC converters must strictly follow the
national safety regulations in compliance with the enclo-
sure, 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 connec-
tions.
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.
Table 8: Pin allocation for standard industrial pinout
Pin Single output units Dual output units
2Vi– Vi–
3Vi– Vi–
10 n.c. -
11 - Vo–
14 Vo+ Vo+
16 Vo– Go
22 Vi+ Vi+
23 Vi+ Vi+
Table 9: Pin allocation for K pinout (option K)
Pin Single output units Dual output units
1Vi+ Vi+
2 n.c. -
10 - Go
11 - Go
12 Vo– -
13 Vo+ Vo–
15 - Vo+
24 Vi– Vi–
1
12
13 24
10013
Bottom view
Fig. 18
Pin numbering
Input Fuse
To prevent excessive current flowing through the input sup-
ply 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 types.
Safety of operator accessible output circuits
If the output circuit of a DC-DC converter is operator acces-
sible, it shall be an SEL V 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 SEL V cir-
cuit according to IEC/EN 60950 up to a configured output
voltage (sum of nominal voltages if in series or +/– configu-
ration) of 46 V.
However, it is the sole responsibility of the installer to en-
sure the compliance with the relevant and applicable safety
regulations. More information is given in: Technical Infor-
mation: 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 sub-
ject to a maximum transient rating of 1500 V for IMS 6.
The DC-DC converters are subject to manufacturing sur-
veillance in accordance with the above mentioned UL,
CSA, EN and ISO 9001 standards.
IMS6 Series: 6W DC-DC Converters
18-36V & 36-75V Inputs
Single and Dual outputs 5V, 12V & 15V
REV. JUN 14, 2004 Page 10 of 10
Table 10: Electric strength test voltages
Characteristic Input - Output Unit
IMS6
Electric strength 1.2 kVrms
test voltage 1 s 1.5 kV DC
Coupling 1.2 nF
capacitance
Insulation resist. >100 MΩ
at 500 V DC
Partial discharge Consult factory k V
extinction voltage
AC-DC
front
end
DC-DC
con-
verter
M
ains
Fuse
Battery
Earth
connection
Suppressor
diode SEL
V
Earth
connection
+
–
~
~
1000
4
Fig. 19
Schematic safety concept. Use fuse, suppressor diode
and earth connection as per table: Safety concept leading
to an SELV output circuit.
Table 11: Insulation concept leading to an SELV output circuit
Conditions Front end DC-DC converter Result
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
including mains supplied from the circuit
battery charger front end 1
Mains Basic <60 V Earthed SELV circuit 2 Operational insulation, pro- SELV circuit
<250 V AC vided by the DC-DC converter
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.
Cleaning Agents
In order to avoid possible damage, any penetration of
cleaning fluids has to be prevented, since the power sup-
plies 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 ac-
cordance with IEC/EN 60950 and UL 1950 and should not
be repeated in the field. Power-One will not honour any
guarantee claims resulting from electric strength field tests.
Description of Options
Table 12: Survey of options
Option Function of option Characteristic
K Alternative pinout Contact factory for availability
Z Open frame All models are available without case