Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 1/20
15 Watt DC-DC Converters IMX 15 Series
IMY 15 Series
Wide input voltage ranges up to 150 V DC
1 or 2 outputs up to 48 V DC
1500...4000 V DC I/O electric strength test
• Extremely wide input voltage ranges
• Electrical isolation, also between outputs
• Emissions below EN 55022, level B
• Immunity to IEC/EN 61000-4-2,-3,-4,-5 and -6
• High efficiency (typ. 87%)
• Input undervoltage lock-out
• Shut down input, output voltages adjustable
• Flex power: Flexible load distribution on outputs
• Outputs no-load, overload and short-circuit proof
• Operating ambient temperature up to –40...85°C
• Thermal protection
• 2" × 1.6" case with 10.5 mm profile
• Supplementary insulation: 20/40 IMX 15 types
• Double or reinforced insulation: 110 IMY 15 types
Summary
The IMX 15 and IMY 15 series of board mountable 15 Watt
DC-DC converters has been designed according to the lat-
est industry requirements and standards. The converters
are particularly suitable for use in mobile or stationary appli-
cations in transport, railways, industry, or telecommunica-
tion where variable input voltages or high transient voltages
are prevalent.
Covering a total input voltage range from 8.4 up to 150 V
with 3 different types, the units are available with single,
dual and electrically isolated double outputs from 3.3 up to
48 V externally adjustable, with flexible load distribution on
dual and double output units. A shut down input allows re-
mote converter on-off. Features include consistently high
efficiency over the entire input voltage range, high reliability
and excellent dynamic response to load and line changes.
The converters are designed and built according to the in-
ternational safety standards IEC/EN 60950, UL 1950, CAN/
CSA C22.2 No.950-95. LGA, UL and cUL approvals are in
progress. The 20 IMX 15 and 40 IMX 15 types provide sup-
plementary insulation. Connected to a secondary circuit the
40 IMX 15 types provide SELV outputs even if the bus volt-
age at the converter input exceeds the SELV-limit of
60 V DC. The 110 IMY 15 types provide double insulation
and are CE marked. They may be connected to e.g. a recti-
fied 110 V AC source without any further isolation barrier.
The circuit comprises of integrated planar magnetics and
all components are automatically assembled and solidly
soldered onto a single PCB without any wire connection.
Magnetic feedback ensures maximum reliability and re-
peatability in the control loop over all operating conditions.
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. For
extremely high vibration environments the case has holes
for screw mounting. Various options as e.g. extended tem-
perature range –40...85°C or an alternative pinout provide
a high level of application specific engineering and design-
in flexibility.
Safety according to IEC/EN 60950, UL 1950
Approvals pending
51
2.0"
40.6
1.6"
10.5
0.42"
1
1 For 110 IMY 15 types
Table of Contents Page
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 2
Type Key and Product Marking ........................................ 3
Functional Description ..................................................... 4
Electrical Input Data ......................................................... 5
Electrical Output Data ...................................................... 7
Page
Auxiliary Functions ......................................................... 12
Electromagnetic Compatibility (EMC) ............................ 13
Immunity to Environmental Conditions .......................... 15
Mechanical Data ............................................................ 16
Safety and Installation Instructions ................................ 17
Description of Option ..................................................... 20
LGA
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 2/20
Type Survey and Key Data
Table 1: Type survey
Output 1 Output 2 Output Input voltage Efficiency Type designation Options 2
U
o nom
I
o nom 1
U
o nom
I
o nom 1 power
U
i min...
U
i max htyp
[V DC] [A] [V DC] [A]
P
o nom [W] [V DC] [%]
2.5 4.5 - - 11.3 8.4...36 84 20 IMX 15-2.5-9RG -8, i, C, L, Z
2.5 4.5 - - 11.3 16.8...75 3 84 40 IMX 15-2.5-9RG -8, i, C, L, Z
3.3 4.5 - - 14.9 8.4...36 84 20 IMX 15-03-9RG -8, i, C, L, Z
3.3 4.5 - - 14.9 16.8...75 3 85 40 IMX 15-03-9RG -8, i, C, L, Z
3.3 4.5 - - 14.9 50...150 4 84 110 IMY 15-03-9RG -8, i, C, L, Z
5.1 3.5 - - 17.8 8.4...36 88 20 IMX 15-05-9RG -8, i, C, L, Z
5.1 3.5 - - 17.8 16.8...75 3 88 40 IMX 15-05-9RG -8, i, C, L, Z
5.1 3.5 - - 17.8 50...150 4 86 110 IMY 15-05-9RG -8, i, C, L, Z
5.1 2.3 - - 11.7 8.4...36 85 20 IMX 15-05-9R -8, i, C, L, Z
5.1 2.5 - - 12.8 16.8...75 3 83 40 IMX 15-05-9R -8, i, C, L, Z
5.1 2.5 - - 12.8 50...150 4 83 110 IMY 15-05-9R -8, i, C, L, Z
5.1 1.35 3.3 1.35 11.3 8.4...36 84 20 IMX 15-0503-9R -8, i, C, L, Z
5.1 1.5 3.3 1.5 12.6 16.8...75 3 84 40 IMX 15-0503-9R -8, i, C, L, Z
5.1 1.5 3.3 1.5 12.6 50...150 4 82 110 IMY 15-0503-9R -8, i, C, L, Z
5 1.3 5 1.3 13.0 8.4...36 86 20 IMX 15-05-05-9 -8, R, K, i, C, L, Z
5 1.4 5 1.4 14.0 16.8...75 3 86 40 IMX 15-05-05-9 -8, R, K, i, C, L, Z
5 1.4 5 1.4 14.0 50...150 4 86 110 IMY 15-05-05-9 -8, R, i, C, L, Z
12 0.65 12 0.65 15.6 8.4...36 88 20 MX 15-12-12-9 -8, R, K, i, C, L, Z
12 0.7 12 0.7 16.8 16.8...75 3 88 40 IMX 15-12-12-9 -8, R, K, i, C, L, Z
12 0.7 12 0.7 16.8 50...150 4 87 110 IMY 15-12-12-9 -8, R, i, C, L, Z
15 0.5 15 0.5 15.0 8.4...36 88 20 IMX 15-15-15-9 -8, R, K, i, C, L, Z
15 0.56 15 0.56 16.8 16.8...75 3 88 40 IMX 15-15-15-9 -8, R, K, i, C, L, Z
15 0.56 15 0.56 16.8 50...150 4 87 110 IMY 15-15-15-9 -8, R, i, C, L, Z
24 0.32 24 0.32 15.4 8.4...36 86 20 IMX 15-24-24-9 -8, R, K, i, C, L, Z
24 0.35 24 0.35 16.8 16.8...75 3 86 40 IMX 15-24-24-9 -8, R, K, i, C, L, Z
24 0.35 24 0.35 16.8 50...150 4 86 110 IMY 15-24-24-9 -8, R, i, C, L, Z
1Flexible load distribution on dual and double outputs possible up to 75% of the total output power
P
o nom on one of the 2 outputs.
IMX/IMY 15-0503 types have reduced load distribution flexibility; 1.8 A max. on one of the 2 outputs. The other output should not ex-
ceed the difference to the total output power
P
o nom.
2See:
Description of Options.
3Short-time operation down to
U
i min ≥14.4 V possible.
P
o reduced to approx. 85% of rated output power.
4Short-time operation down to
U
i min ≥43.2 V possible.
P
o reduced to approx. 85% of rated output power.
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 3/20
Type Key and Product Marking
20 IMX 15 - 05 - 05 -7 R G K i C L Z
Input voltage range
U
i
8.4...36 V DC ........................................... 20
16.8...75 V DC ........................................... 40
50...150 V DC ......................................... 110
Series ......................................................... IMX 15, IMY 15
Output voltage type output 1 ........... 2.5, 03, 05, 12, 15, 24
Dash designates double output unit with two
independent electrically isolated outputs ...... - 1
Output voltage type output 2 .................. 03, 05, 12, 15, 24
Operating ambient temperature range
T
A
–40...71°C (standard) ................................. -9
–40...85°C (option) ..................................... -8 2
Options and features:
R input and magnetic feedback .................. R 2 3
Synchronous rectification............................ G
Alternative pinout ......................................... K 2 4
Inhibit ............................................................ i 2 5
Industrial C-pinout ...................................... C
Surface mount version with PCB lid ............ L
Open frame .................................................. Z
1Not applicable with option K or -0503- types. 2 For delivery lead times contact factory. Some types require a minimum order quantity.
3Standard features for single output and -0503- types. Optional for double output units. Excludes option K.
4Option K excludes option R. 5 Option inhibit excludes shut down and option K.
Examples: 20 IMX 15-05-05-9: DC-DC converter, input voltage range 8.4...36 V, 2 electrically isolated outputs each pro-
viding 5 V, 1.3 A.
110 IMY 15-0503-9R: DC-DC converter, input voltage range 50...150 V, 2 outputs with common return provid-
ing +5.1 V, 1.5 A and +3.3 V, 1.5 A. Unit fitted with magnetic feedback for tight output voltage regulation.
Product Marking
Basic type designation, output voltages and currents, applicable safety approval and recognition marks, Power-One patent
nos. and company logo. Date code and serial no.
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 4/20
Functional Description
The IMX/IMY 15 series of DC-DC converters are magnetic
feed-back controlled flyback converters using current mode
PWM (Pulse Width Modulation). The -05- and -0503- output
voltage versions as well as all double output versions fitted
with option R feature an active magnetic feedback loop via
a pulse transformer which results in very tight regulation of
the output voltage (see fig.:
Block diagram, single output
types, -0503- types and double output types with option R
).
The output voltages of these versions can be adjusted via
the R input. The R input is referenced to the secondary side
and allows for programming of the output voltages in the
range of approximately 80 to 105% of
U
o nom using either an
external resistor or an external voltage source.
The voltage regulation on the dual and double output ver-
sions without option R is achieved with a passive trans-
former feedback from the main transformer (see fig.:
Block
diagram, for double output types
). The output voltages can
be adjusted via the Trim input. The Trim input is referenced
to the primary side of the converter and allows for program-
ming of the output voltages in the range 100 to 105% of
U
o nom by an external resistor or within 75 to 105% using an
external voltage source. The load regulation output charac-
teristic allows for paralleling of one or several double output
units with equal output voltages.
Current limitation is provided by the primary circuit, thus
limiting the total output power of double output types. The
shut down input allows remote converter on/off.
Overtemperature protection will shut down the unit in ex-
cessive overload conditions with automatic restart approxi-
mately every 50 to 60 ms.
PWM
2 × 2200 pF
1
2
4
11
15
13
Vi+
SD
Vi–
Vo+
Go
Vo
–
03088
17 n.c.
3
Trim
PWM
2 × 2200 pF
1
2
3
4
13
15
12
11
Vi+
SD
Vi–
Vo1+
Go
n.c. Vo2+
Go
03089
17
R
PWM
2 × 2200 pF
1500 V
1
2
3
5
Vi+
Vi–
Vo+
Vo–
03039
Fig. 1
Block diagram, single output types
Fig. 2
Block diagram, dual output types, alternative K-pinout.
Fig. 3
Block diagram, -0503- types.
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 5/20
PWM
2 × 2200 pF
1
2
3
4
11
12
15
13
Vi+
SD
Vi–
Vo1+
Vo1–
Trim Vo2+
Vo2–
03090
17 n.c.
PWM
2 × 2200 pF
1
2
3
4
11
12
15
13
Vi+
SD
Vi—
Vo1+
Vo1
—
n.c. Vo2+
Vo2
—
03092
17 R
Fig. 4
Block diagram, double output types, standard pinout.
Fig. 5
Block diagram, double output types with option R.
Electrical Input Data
General conditions:
–T
A = 25°C, unless
T
C is specified.
–Shut down pin left open circuit (not connected).
–Trim or R input not connected.
Table 2: Input Data
Input 20 IMX 40 IMX 110 IMY
Characteristics Conditions min typ max min typ max min typ max Unit
U
iInput voltage range 1
T
A min...
T
A max 8.4 5 36 16.8 5 6 75 50 5 7 150 V DC
U
i nom Nominal input voltage
I
o = 0...
I
o nom 20 40 110
U
i sur Repetitive surge voltage Abs. max input (3 s) 40 9100 168
t
start up Converter Switch on Worst case condition at 0.25 0.5 0.25 0.5 0.25 0.5 s
start-up time 2 SD high
U
i min and full load 0.1 0.1 0.1
t
rise Rise time 2
U
i nom resist load 5 5 5 ms
I
o nom capac. load 10 20 10 20 10 20
I
i o No load input current
I
o = 0,
U
i min...
U
i max 40 20 10 mA
I
irr Reflected ripple current
I
o = 0...
I
o nom 30 30 20
I
inr p Inrush peak current 3
U
i =
U
i nom 8910A
C
iInput capacitance for surge calculation 1.5 0.75 0.35 µF
U
SD Shut down voltage Unit shut down –10...0.7 –10...0.7 –10...0.7 V DC
Unit operating open or 2...20 open or 2...20 open or 2...20
R
SD Shut down input resistance For current calculations approx. 10 approx. 10 approx. 10 kΩ
I
SD Input current if unit
U
i min...
U
i max 631mA
shut down
f
sSwitching frequency
U
i min...
U
i max,
I
o = 0...
I
o nom approx. 300 approx. 300 approx. 300 kHz
u
i RFI Input RFI levelconducted EN 55022 4 B 8 BB
1
U
i min will not be as stated if
U
o is increased above
U
o nom by use of the R or the Trin input. If the output voltage is set to a higher value,
U
i min will be proportionately increased.
2Measured with resistive and max. admissible capacitive load.
3Source impedance according to prETS 300132-2, version 4.3.
4Measured with a lead length of 0.1 m, leads twisted. Double output units with both outputs in parallel.
5Input undervoltage lock-out at typ. 80% of
U
i min.
6Short time operation down to
U
i min >14.4 V possible.
P
o reduced to approx. 85% of
P
o nom.
7Short time operation down to
U
i min >43.2 V possible.
P
o reduced to approx. 85% of
P
o nom.
820 IMX 15 types require 4.7 µF/50 V capacitance accross the input (Polyester, Philips 372 series).
9See:
Transient ETR 283 (19Pfl1), Electromagnetic Immunity
.
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 6/20
Inrush current
The inrush current has been kept as low as possible by
choosing a very small input capacitance. A series resistor
may be installed in the input line to further reduce this cur-
rent.
I [A]
t [µs]
04022
010 20 30 40 50 60 70 80 90 100
4
3
2
1
Fig. 6
Typical inrush current at U
i nom
, P
o nom
versus time
(40 IMX 15). Source impedance according to
prETS 300132-2, version 4.3 at U
i nom
.
Fig. 7
Converter start-up and rise time
U
o nom
U
o
t
start up
t
rise
t
04008
Input Undervoltage Lockout
A special feature of these units is the accurate undervoltage
lockout protection which protects the units (and system)
from large currents caused by operation at low voltages.
This ensures easier start-up in distributed power systems.
Table 3: Turn on and turn off voltage
Type Turn On Turn Off Units
20 IMX 7.5...8 7...7.5 V
40 IMX 12.5...13.5 12...13
110 IMY 40...42.5 38...40.5
Input Transient Voltage Protection
A built-in suppressor diode provides effective protection
against input transients which may be caused for example
by short-circuits accross the input lines where the network
inductance may cause high energy pulses.
Table 5: Built-in transient voltage suppressor
Type Breakdown Peak power Peak pulse
voltage at 1 ms current
VBr nom [V]
P
p [W]
I
pp [A]
20 IMX 15 40 1500 22
40 IMX 15 100 1500 9.7
110 IMY 15 168 600 0.5
For very high energy transients as for example to achieve
IEC/EN 61000-4-5 or ETR 283 (19 Pfl1) compliance (as per
table:
Electromagnetic Immunity
) an external inductor and
capacitor are required. The components should have simi-
lar characteristics as listed in table:
Components for exter-
nal circuitry for IEC/EN 61000-4-5, level 2 or ETR 283
(19Pfl1) compliance
.
Note: The suppressor diode D is only necessary for
20 IMX 15 types.
Table 6: Components for external circuitry for IEC/EN
61000-4-5, level 2 or ETR 283 (19Pfl1) compliance.
Type Inductor (L) Capacitor (C) Diode (D)
20 IMX 68 µH, 2.7 A 330 µF, 63 V 1.5 k E47A
40 IMX 220 µH, 1.3 A 2 × 100 µF, 100 V -
110 IMY 330 µH, 0.43 A 2 × 100 µF, 200 V -
Vi+
Vi–
C
L
D
+
04036
Fig. 8
Example for external circuitry to comply with IEC/EN
61000-4-5 or ETR 283 (19Pfl1); the diode D is only neces-
sary for 20 IMX 15 types.
Reverse Polarity Protection
The built-in suppressor diode also provides for reverse po-
larity protection at the input by conducting current in the re-
verse direction. An external fuse is required to limit this cur-
rent.
Table 4: Recommended external fuses
Converter type Fuse type
20 IMX 15 F4.0A
40 IMX 15 F2.0A
110 IMY 15 F1.0A
10
5
5
10
04051
Fig. 9
Dimensions of inductor L for 110 IMY 15 types
(e.g. TOKO 494LYF-0098K).
22
23.8
11.5
04052
Fig. 10
Dimensions of inductor L for 20 IMX 15 and 40 IMX 15
types (e.g. Coil Craft, PCH-45 series).
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 7/20
Electrical Output Data
General conditions:
– T
A = 25°C, unless
T
C is specified
– Shutdown pin left open circuit (not connected)
– R input not connected
Table 7a: Output data for single output units and -0503- types.
Output 2.5 V (RG) 3.3 V (RG) 5.1 V (RG)
Characteristics Conditions min typ max min typ max min typ max Unit
U
o1 Output voltage
U
i nom 3.27 3.33 3.25 3.35 5.05 5.15 V DC
U
o2
I
o = 0.5
I
o nom
I
o nom Output current 1 20 IMX
U
i min...
U
i max 4.5 4.5 3.5 A
40 IMX/110 IMY 4.5 4.5 3.5
I
o1L Current limit 2, 4 20 IMX
U
i nom,
T
C = 25°C 6.0 6.0 4.6
I
o2L
U
o1 – 93%
U
nom
I
o1L 40 IMX/110 IMY 6.0 6.0 4.6
I
o2L
D
U
oLine/load regulation
U
i min...
U
i max,±0.5 ±0.5 ±0.5 %
I
o = (0.01...1) •
I
o nom
u
o1/2 Output voltage noise
U
i min...
U
i max 5100 100 100 mVpp
I
o =
I
o nom 660 60 60
U
o L Output overvoltage limit. 7 115 130 115 130 115 130 %
C
o ext Admissible capacitive load 4000 4000 4000 µF
u
o d Dynamic Voltage deviat.
U
i nom ±250 ±250 ±250 mV
t
dload Recovery time
I
o nom ↔ 1/2
I
o nom 11 1ms
regulation IEC/EN 61204
aUo Temperature coefficient
U
i min...
U
i max ±0.02 ±0.02 ±0.02 %/K
D
U
o/D
T
C
I
o = 0...
I
o max
1Flexible load distribution: 20 IMX 15-0503-7; 1.6 A max. and 40 IMX 15/110 IMY 15-0503-7 types; 1.8 A max. on one of the 2 outputs,
the other output should not be loaded such that the total output power exceeds
P
o nom according to table:
Type survey
.
2The current limit is primary side controlled. In the event of a sustained overload condition the thermal protection may cause the unit to
shutdown (restart on cool-down ).
3For -0503- types: total capacitance, 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
7The overvoltage protection is via a primary side second regulation loop. It is not tracking with R control
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 8/20
Table 7b: Output data for single output units and -0503- types.
Output 5.1 V 5.1/3.3 V
Characteristics Conditions min typ max min typ max Unit
U
o1 Output voltage
U
i nom 5.05 5.15 5.0 5.12 V DC
U
o2
I
o = 0.5
I
o nom 3.13 3.46
I
o nom Output current 1 20 IMX
U
i min...
U
i max 2.3 2 × 1.35 A
40 IMX/110 IMY 2.5 2 × 1.5
I
o1L Current limit 2, 4 20 IMX
U
i nom,
T
C = 25°C 3.2 2.7
I
o2L
U
o1 – 93%
U
nom 3.8
I
o1L 40 IMX/110 IMY 3.6 2.9
I
o2L 4.0
D
U
oLine/load regulation
U
i min...
U
i max,±0.5 %
I
o = (0.01...1) •
I
o nom
5.1 V
U
i nom +3, –5
3.3 V
I
o = (0.1...1)
I
o nom ±4.5
u
o1/2 Output voltage noise
U
i min...
U
i max 570 80 mVpp
I
o =
I
o nom 640 40
U
o L Output overvoltage limit. 7 115 130 115 130 %
C
o ext Admissible capacitive load 4000 total: 4000 3 µF
u
o d Dynamic Voltage deviat.
U
i nom ±250 ±150 mV
t
dload Recovery time
I
o nom ↔ 1/2
I
o nom 11ms
regulation IEC/EN 61204
aUo Temperature coefficient
U
i min...
U
i max ±0.02 ±0.02 %/K
D
U
o/D
T
C
I
o = 0...
I
o max
1Flexible load distribution: 20 IMX 15-0503-7; 1.6 A max. and 40 IMX 15/110 IMY 15-0503-7 types; 1.8 A max. on one of the 2 outputs,
the other output should not be loaded such that the total output power exceeds
P
o nom according to table:
Type survey
.
2The current limit is primary side controlled. In the event of a sustained overload condition the thermal protection may cause the unit to
shutdown (restart on cool-down ).
3For -0503- types: total capacitance, 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
7The overvoltage protection is via a primary side second regulation loop. It is not tracking with R control
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 9/20
Table 7c: Output data for dual and double output units.
Output 2 × 5 V 2 × 12 V 2 × 15 V 2 × 24 V
Characteristics Conditions min typ max min typ max min typ max min typ max Unit
U
o1 Output voltage
U
i nom 4.95 5.05 11.90 12.10 14.88 15.12 23.80 24.20 V DC
U
o2
I
o = 0.5
I
o nom 4.94 5.06 11.88 12.12 14.85 15.15 23.75 24.25
I
o nom Output current 1 20 IMX
U
i min...
U
i max 2 × 1.3 2 × 0.65 2 × 0.50 2 × 0.32 A
40 IMX/110 IMY 2 × 1.4 2 × 0.70 2 × 0.56 2 × 0.35
I
oL Current limit 2, 4 20 IMX
U
i nom,
T
C = 25°C 3.0 1.6 1.3 0.85
40 IMX/110 IMY
U
o = 93%
U
o nom 3.2 1.7 1.4 0.90
D
U
o1 Line/load regulation
U
o1
U
i min...
U
i max,
I
o nom ±1±1±1±1%
D
U
o2
U
o2
U
i nom ±3±3±3±3
I
o = (0.1...1)
I
o nom
u
o1/2 Output voltage noise
U
i min...
U
i max 580 120 150 240 mVpp
I
o =
I
o nom 640 60 70 120
U
o L Output overvoltage limit. 7 Min. load 1% 115 130 115 130 115 130 115 130 %
C
o ext Admissible capacitive load 3 4000 680 470 180 µF
u
o d Dynamic Voltage deviat.
U
i nom ±250 ±300 ±300 ±600 mV
t
dload Recovery time
I
o nom ↔ 1/2
I
o nom 1111ms
regulation
aUo Temperature coefficient
U
i min...
U
i max ±0.02 ±0.02 ±0.02 ±0.02 %/K
D
U
o/D
T
C
I
o = 0...
I
o max
1Flexible load distribution: With double or dual output units each output is capable of delivering 75% of the total output power.
The other output should not be loaded such that the total output power exceeds
P
o nom according to table:
Type survey
.
2The current limit is primary side controlled. In the event of a sustained overload condition the thermal protection may cause the unit to
shutdown (restart on cool-down).
3Measured with both outputs connected in parallel.
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
7The overvoltage protection is via a primary side second regulation loop, not tracking with Trim control.
8Minimum load of 10% on output 1 recommended to prevent the two output voltages to drop in unbalanced load conditions.
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 10/20
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
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:
Mechani-
cal 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 inte-
gration into a system. The thermal conditions are influ-
enced by input voltage, output current, airflow, temperature
of surrounding components and surfaces and the proper-
ties 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:
Mechani-
cal Data
) may under no circumstances exceed the
specified maximum value. The installer must ensure that
under all operating conditions
T
C remains within the lim-
its stated in the table:
Temperature specifications.
Output Overvoltage Protection
The output of single output units as well as -0503- and
-05-05- types are protected against overvoltages by a sec-
ond control loop. In the event of an overvoltage on one of
the outputs the unit will shut down and attempt to restart
approximately every 50 to 60 ms. Double and dual output
units (with exception of the -0503- and -05-05- types) are
protected against overvoltages by a Zener diode across the
second output. Under worst case conditions the Zener di-
ode will short circuit. Since with double output units both
outputs track each other the protection diode is only pro-
vided in one of the outputs. The main purpose of this fea-
ture is to protect against possible overvoltages which could
occur due to a failure in the feedback control circuit. The
output overvoltage protection is not designed to withstand
externally applied overvoltages.
Overtemperature Protection
The converters are protected from possible overheating by
means of an internal temperature monitoring circuit. It shuts
down the unit above the internal temperature limit and at-
tempts to automatically restart every 50 to 60 ms. This fea-
ture prevents from excessive internal temperature building
up which could occur in heavy overload conditions.
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 (hiccup mode).
Connection in Series
The outputs of one or several single or double output units
can be connected in series without any precautions, taking
into consideration that the highest output voltage should
remain below 42 V to ensure that the output remains SELV.
Connection in Parallel
The outputs of one or several double output units (except
-0503- types) with equal nominal output voltage can be
connected in parallel. Approximate current sharing be-
tween 2 or several units is ensured by their load dependent
output characteristic. The two outputs of a double output
unit fitted with option R can be connected in parallel to
configure a single output with tight regulation at full load.
Typical Performance Curves
General conditions:
– T
A = 25ºC, unless
T
C is specified.
– Shut down pin left open circuit.
– Trim or R input not connected.
Fig. 11
U
o
versus I
o
(typ) of units with U
o
= 5.1 V.
(110 IMY 15-05-7R)
Fig. 12
U
o
versus I
o
(typ) of double output units (2
×
12 V), with
both outputs in parallel. (110 IMY 15-12-12-7)
7
8
9
10
11
12
13
U
o
[V]
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 I
o total
[A]
0
05020
5.5
5.0
4.5
4.0
3.5
3.0 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
I
o
[A]
U
o
[V]
05166
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 11/20
11.0
11.5
12.0
12.5
13.0
13.5
U
o1
[V]
0.06 0.20 0.30 0.40 0.50 0.60 0.70
I
o1
[A]
0.10
05021
I
o2
= 0.35 A
I
o2
= 0.035 A
Fig. 13
Cross load regulation U
o1
versus I
o1
(typ) for various I
o2
(2
×
12 V)
.
Fig. 17
Flexible load distribution on double outputs (2
¥
12 V) with
load variation from 0...150% of P
o1 nom
on output 1.
Output 2 loaded with 50% of P
o2 nom
.
U
o1
,
U
o2
[V]
I
o1
I
o1 nom
05039
14
13
12
11
10 025
50 75 100 150 [%]
U
o2
U
o1
125
7
8
9
10
11
12
13
U
o
[V]
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
I
o total
[A]
0
05150
Fig. 14
U
o
versus I
o
(typ) of double output units with option R
(2
×
12 V), with both outputs in parallel.
110 IMY 15-12-12-7R.
U
o1
,
U
o2
[V]
I
o1
I
o1 nom
05151
14
13
12
11
10 025
50 75 100 150 [%]
U
o2
U
o1
125
Fig. 18
Flexible load distribution on double outputs with option R
(2
×
12 V) with load variation from 0...150% of P
o1 nom
on
output 1. Output 2 loaded with 50% of P
o2 nom
.
110 IMY 15-12-12-7R.
Note: Minimum load of approx. 10% on output 1 prevents
voltage drop in unballanced load condition.
60
70
80
90
h [%]
50 75 100
P
o
P
o total
25
05167
[%]
U
i min
U
i nom
U
i max
60
70
80
90
h [%]
50 75 100
P
o
P
o total
25
05168
[%]
U
i min
U
i nom
U
i max
Fig. 15
Efficiency versus input voltage and load. Typical values
40 IMX 15-12-12-7 Fig. 19
Efficiency versus input voltage and load. Typical values
110 IMY 15-12-12-7
70
100
U
o [%]
t
[ms]
05041
8.5
60.5
60.5
overload short circuit condition
switch-off
Fig. 16
Overload switch off (hiccup mode), typical values.
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 12/20
Auxiliary Functions
Shut Down Function
The outputs of the converters may be enabled or disabled
by means of a logic signal (TTL, CMOS, etc.) applied to the
shut down pin. If the shut down function is not required then
it should be left open-circuit.
Converter operating: 2.0...20 V
Converter shut down: –10...0.7 V
Adjustable Output Voltage
–R input for single output units using synchronous rectifi-
cation (G)
–R input for single output units and -0503- types; optional
for double output units
–Trim input for double output units
As a standard feature, the single and double output units of-
fer adjustable output voltage(s) by using the control input R
or Trim. If the control input is left open-circuit the output volt-
age is set to
U
o nom. For output voltages
U
o >
U
o nom, the
minimum input voltage
U
i min (see:
Electrical Input Data
) in-
creases proportionally to
U
o/
U
o nom.
Single output units using synchronous rectification (G):
The R input is referenced to the secondary side of the con-
verter. Adjustment of the output voltage is possible by
means of an external resistor connected between the R pin
and either Vo+ or Vo–.
Note: For the units with synchronous rectification
U
o ad-
justment is different from the standard single output units
and -0503- types.
Double output units with Trim input:
The Trim input is referenced to the primary side. The figure
below shows the circuit topology. Adjustment of the output
voltage is possible by means of either an external resistor
R
ext in the range of 100...105% of
U
o nom or an external volt-
age source in the range of 75...105% of
U
o nom.
Trim
Vo1+
Vo2–
+
Uext
–
Vi+
Vi–
Rext
Vo1–
Vo2+
06089
Control
circuit
U
ref
2.5 V
Fig. 22
Output voltage control for double output units by means of
the Trim input.
R
Vo+
Vo–
+
U
ext
–
4 kΩUref 2.5 V
control
circuit
Vi+
Vi–
R
ext1
R
ext2
06029
Fig. 21
Output voltage control for single output units, -0503- types
and double output units fitted with option R by means of
the R input.
Single output units, -0503- types and double output units fit-
ted with option R:
The R input is referenced to the secondary side of the con-
verter. Adjustment of the output voltage is possible by
means of either an external resistor or a voltage source.
a) Adjustment by means of an external resistor
R
ext.
Depending upon the value of the required output voltage,
the resistor shall be connected.
either: Between the R pin and Vo– to achieve an output
voltage adjustment range of approximately
U
o = 80...100 %
U
o nom.
U
o
R
ext1 ≈ 4 kΩ • –––––––––
U
o nom –
U
o
or: Between the R pin and Vo+ to achieve an output volt-
age range of approximately
U
o = 100...105%
U
o nom.
(
U
o – 2.5V)
R
ext2 ≈ 4 kΩ • ––––––––––––––––––
2.5 V • (
U
o/
U
o nom – 1)
b) Adjustment by means of an external voltage
U
ext be-
tween Vo– and R pins.
The control voltage range is 1.96...2.62 V and allows for
an adjustment in the range of approximately 80...105%
of
U
o nom.
U
o • 2.5 V
U
ext ≈–––––––––
U
o nom
Attempting to adjust the output below this range will
cause the converter to shut down (hiccup mode).
Note: Applying an external control voltage >2.75 V may
damage the converter.
R
Vo+
Vo–
Vi+
Vi–
R
ext2
R
ext1
06131
Fig. 20
Output voltage control for single output units synchronous
rectification.
Table 8: Uo versus Uext approximate values
U
o nom Typ. values of
R
ext1 Typ. values of
R
ext2
[V]
U
o [% of
U
o nom]
R
ext1 [kΩ]
U
o [% of
U
o nom]
R
ext2 [kΩ]
3.3 90 0.47 100 ∞
95 2.7 105 15
100 ∞110 6.8
5.1 90 3.3 100 ∞
95 8.2 105 9.1
100 ∞110 3.9-
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 13/20
a) Adjustment by means of an external resistor
R
ext:
Programming of the output voltage by means of an exter-
nal resistor
R
ext is possible within a limited range of
100...105% of
U
o nom.
R
ext should be connected between
the Trim pin and Vi–. Connection of
R
ext to Vi+ may dam-
age the converter. The following table indicates suitable
resistor values for typical output voltages under nominal
conditions (
U
i nom,
I
o = 0.5
I
o nom), with either paralleled
outputs or equal load conditions on each outputs.
b) Adjustment by means of an external voltage source
U
ext.
For external output voltage programming in the range
75...105% of
U
o nom a (0...20 V) source
U
ext is required,
connected to the Trim pin and Vi–. The table below indi-
cates typical
U
o versus
U
ext values under nominal condi-
tions (
U
i nom,
I
o = 0.5
I
o nom), with either paralleled outputs
or equal load conditions on each output. Applying a con-
trol voltage >20 V will set the converter into a hiccup
mode. Direct paralleling of the Trim pins of units con-
nected in parallel is feasible.
Table 9b: U
o
versus U
ext
for U
o
= 75...105% U
o nom
;
typical values (U
i nom
, I
o1/2
= 0.5 I
o1/2 nom
)
U
o [%
U
o nom]
U
ext [V]
≥105 0
102 1.6
95 4.5
85 9
75 13
Table 9a: R
ext1
for U
o
> U
o nom
;
approximate values (U
i nom
, I
o1, 2
= 0.5 I
o1/2 nom
)
U
o [%
U
o nom]
R
ext [kΩ]
105...108 (107 typically) 0
105 1.5
104 5.6
103 12
102 27
101 68
100 ∞
Electromagnetic Immunity
Table 10: Immunity type tests
Phenomenon Standard 1 Class Coupling Value Waveform Source Test In Per- 3
Level mode 2 applied Imped. procedure oper. form.
Electrostatic IEC/EN 2 contact discharge 4000 Vp1/50 ns 330 Ω10 positive and yes B
discharge 61000-4-2 (R pin open) 10 negative
to case 3 air discharge 8000 Vpdischarges
(R pin open)
Electromagnetic IEC/EN 3 antenna 10 V/m AM 80% 26…1000 MHz yes A
field 61000-4-3 1 kHz
ENV 50204 PM, 50% duty 900 MHz
cycle, 200 Hz
resp. frequ.
Electrical fast IEC/EN 4 direct +i/–i 4000 Vpbursts of 5/50 ns 50 Ω1 min positive yes B
transient/burst 61000-4-4 5 kHz rep. rate 1 min negative
transients with transients per
15 ms burst coupling mode
duration and a
300 ms period
Surge IEC/EN 3 +i/–i 2000 Vp1.2/50 µs2 Ω5 pos. and 5 neg. yes B
61000-4-5 5 impulses per
coupling mode
Conducted IEC/EN 3 +i/–i 10 Vrms AM modulated 50 Ω0.15...80 MHz yes A
disturbancies 61000-4-6 (140 dBµV) 80%, 1 kHz 150 Ω
Transient ETR 283 +i/–i 150 Vp0.1/0.3 ms limited to 3 positive yes B
(19 Pfl 1) 4 <100 A
1Related and previous standards are referenced in:
Technical Information: Standards
.
2i = input, o = output.
3A = normal operation, no deviation from specification, B = temporary deviation from specs. possibe.
4For 40 IMX 15 types (additional external components required). Not applicable for 20 IMX 15 types.
5External components required.
which typically occur in many installations, but especially in
battery driven mobile applications.
Electromagnetic Compatibility (EMC)
A suppressor diode together with an input filter form an ef-
fective protection against high input transient voltages
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 14/20
CISPR 22/EN 55022, Level B Radiated
Electromagnetic emission requirements according to
EN 55022, class B (radiated emmission) can be achieved
by adding an external common mode choke and (for
20 IMX 15 types) an additional capacitor, see:
Input Data
.
The filter components should be placed as close as possi-
ble to the input of the converter.
Fig. 26
Choke dimensions
Vi+
Vi–
L
V+
V–
Module
07114
Fig. 25
Example for external circuitry to comply with CISPR22/EN
55022, level B, radiated
15 8.5
15
07110
Table 11: Input filter components for EN 55022, level B,
radiated.
Type Current compensated choke
20 IMX 15 1 mH, 2A
40 IMX 15 e.g. Tokin, type SC-02-10GS
110 IMY 15
Fig. 23
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.
(40 IMX 15-05-7R)
Electromagnetic Emission
07020
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]
MHz
0
.02
50
40
30
20
10
0
30
50
100
200
500
1000
[dBµV/m]
[MHz]
A
B
07108
Fig. 24
Typical radio frequency-interference voltage at U
i nom
,
I
o nom
, measured with an antenna (distance 10 m).
Output leads 1 m, twisted.
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 15/20
Table 14: Mechanical stress
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
g
n = 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
g
n = 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) MIL-STD-810D section 514.3 5
g
n = 49 m/s2 (60...2000 Hz) operating
Frequency (1 Oct/min): 10...2000 Hz
Test duration: 7.5 h (2.5 h each axis)
Fda Random vibration IEC 60068-2-35 Acceleration spectral density: 0.05
g
n2/Hz Unit
wide band Frequency band: 20...500 Hz operating
reproducibility Acceleration magnitude: 4.9
g
n rms
high 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 12: Temperature specifications, valid for air pressure of 800...1200 hPa (800...1200 mbar)
Temperature -9 Option -8 3
Characteristics Conditions min max min max Unit
T
AAmbient temperature 1 Operational 2 –40 71 –40 85 °C
T
CCase temperature –40 95 –40 105
T
SStorage temperature 1 Non operational –55 100 –55 105
1MIL-STD-810D section 501.2 and 502.2
2See:
Thermal Considerations
3Start up at –55°C
Table 13: MTBF and device hours
MTBF Ground Benign Ground Fixed Ground Mobile
MTBF acc. to MIL-HDBK-217F
T
C = 40°C
T
C = 40°C
T
C = 70°C
T
C = 50°C
110 IMY 15-05-9R 485'000 h 255'000 h 167'000 h 223'000 h
Immunity to Environmental Conditions
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 16/20
50.8 (2")
40.65 (1.6")
10.5 (0.41")
5 (0.19")
0.8 (0.03")
45.72 (1.8")
S09011
1
4
11
17
47 (1.85")
36.83 (1.45")
2.54 (0.1")
Fixing hole for
M2 or KA 22
self tapping screws
5.08 (0.2")
Measuring point of case temperature
T
C
2
3
12
13
15
Mechanical Data
Dimensions in mm. Tolerances ±0.3 mm unless otherwise indicated.
Fig. 27
Case IMX 15, IMY 15
Weight: <35 g
European
Projection
50.8 (2")
40.65 (1.6")
11.2
(0.44")
3.4 (0.13")
45.72 (1.8")
S90010
1
5
5.08 (0.2")
20.3 (0.8")
Measuring point of case temperature
T
C
2
3
4
0.5 (0.02")
45.72 (1.8")
Fig. 29
Open frame (option Z)
Fig. 28
C pinout (option C)
12
48.26 (1.9")
10.5 (0.41")
5 (0.19")
45.72 (1.8")
S90011
1
4
11
17
? (?")
3 x 5.08 (0.2")
6 x 5.08 (0.2")
2
316
12
13
15
14
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 17/20
50.8 (2")
40.65 (1.6")
11.5 (0.45") 54.57 (2.15")
S90012
11
15
5 x 5.08 (0.2")
12
13
16
17
1
4
2
3
6
5
14
6 x 5.08 (0.2")
Fig. 30
Surface mount version with PCB lid (option L)
Safety and Installation Instructions
Installation Instructions
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 with hole diameters of 1.4 mm ±0.1 mm for the pins.
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.
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 F4.0A for
20 IMX 15 types, F2.0 A for 40 IMX 15 types and a fuse
F1.0A for 110 IMY 15 types.
Standards and approvals
All DC-DC converters are pending to be UL recognized ac-
cording 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
•Supplementary insulation input to output, based on their
maximum input voltage (IMX 15 types)
•Reinforced insulation input to output, based on their
maximum input voltage (IMY 15 types)
•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 (IMX 15
types)
•Connecting the input to a primary circuit which is subject
to a maximum transient rating of 2500 V (IMY 15 types)
After approvals the DC-DC converters are subject to manu-
facturing surveillance in accordance with the above men-
tioned UL, CSA, EN and with ISO 9001 standards.
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 18/20
10005
1
2
3
4
11
12
13
15
17
Bottom view
Fig. 31
Pin allocation
Protection Degree
The protection degree of the DC-DC converters is IP 40.
Cleaning Agents
In order to avoid possible damage, any penetration of
cleaning fluids should be prevented, since the power sup-
plies are not hermetically sealed.
Table 15: Pin allocation
Pin Standard Option K Option C Option L and Z
single double -0503- dual single dual single double
1 Vi+ Vi+ Vi+ Vi+ Vi+ Vi+ Vi+ Vi+
2Vi–Vi–Vi–Vi–Vi–Vi–Vi–Vi–
3 - Trim n.c. - Vo+ Vo+ n.c. Trim
4 SD SD SD SD - Go SD SD
5- - - -Vo–Vo–n.c. n.c.
6 - - - - - - n.c. n.c.
11 - Vo1+ Vo2+ Vo+ - - - Vo1–
12 - Vo1–Go - - - - Vo2–
13 Vo+ Vo2+ Vo1+ Go - - Vo+ Vo1+
15 Vo–Vo2–Go Vo–--Vo–Vo2–
17 R n.c./R R n.c. - - R n.c.
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.
Table 16: Electric strength test voltages
Characteristic Input to output Output to Unit
IMX 15 IMY 15 output
Electric strength 1.2 3.0 0.1 kVrms
test voltage 1 s 1.5 4.0 0.15 kV DC
Insulation resistance >100 >100 - MΩ
at 500 V DC
Partial discharge Consult factory - kV
extinction voltage
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 19/20
Table 17: Insulation concept leading to an SELV output circuit
Conditions Front end DC-DC converter Result
Supply Minimum required grade Maximum Minimum required Type Measures to achieve the Safety status of
voltage of isolation, to be provided DC output safety status of the specified safety status of the DC-DC
by the AC-DC front end, voltage front end output the output circuit converter output
including mains supplied from the circuit circuit
battery charger front end 1
Mains Operational (i.e. there is ≤150 V Primary IMY 15 Double or reinforced SELV circuit
≤150 V AC no need for electrical iso- insulation, based on
lation between the mains 150 V AC and DC (pro-
supply voltage and the vided by the DC-DC
DC-DC converter input converter)
voltage)
Mains Basic ≤60 V Earthed SELV circuit 2 IMX 15 Operational insulation
≤250 V AC IMY 15 (provided by the DC-DC
converter)
≤75 V Hazardous voltage IMX 15 Input fuse 3 output sup- Earthed SELV
secondary circuit pressor diodes 4, and circuit
earthed output circuit 2
≤150 V IMY 15 Supplementary insulation SELV circuit
based on 250 V AC and
double or reinforced
insulation, based on the
maximum rated output
voltage from the front end
(provided by the DC-DC
converter)
Double or reinforced ≤60 V SELV circuit IMX 15 Operational insulation
IMY 15 (provided by the DC-DC
converter)
≤75 V Double or reinforced IMX 15 Supplementary insulation
insulated unearthed based on the maximum
hazardous voltage rated output voltage from
secondary circuit 5 the front end (provided by
the DC-DC converter)
≤120 V TNV-2 circuit IMY 15 Double or reinforced
≤150 V Double or reinforced insulation, based on the
insulated earthed or maximum rated output
unearthed hazardous voltage from the front end
voltage secondary (provided by the DC-DC
circuit converter)
Safety of operator accessible output circuit
If the output circuit of a DC-DC converter is operator acces-
sible, it shall be an SELV circuit according to the IEC/EN
60950 related safety standards
The following table shows some possible installation con-
figurations, 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 42 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
.
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 accord-
ing to the relevant safety standard, e.g. IEC/EN 60950.
3The installer shall provide an approved fuse (type with the low-
est rating suitable for the application) in a non-earthed input
conductor 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 at least basic insulation ac-
cording to the relevant safety standard, based on the maximum
output voltage from the front end.
AC-DC
front
end
DC-DC
con-
verter
Mains
Fuse
Battery
Earth
connection
Suppressor
diode SELV
Earth
connection
+
–
~
~
10004
Fig. 32
Schematic safety concept. Use fuse, suppressor diode
and earth connection as per table
Safety concept leading
to an SELV output circuit
.
Board Mountable DC-DC Converters IMX/IMY 15 Series
Edition 7/5.2000 20/20
Option -8
Extended Temperature Range
Extension of the temperature range from standard
–40...85°C. In the upper temperature range the output
power derating below should be observed. The modules
will provide the specified output power with free air convec-
tion cooling.
Option K
Alternative Pinout
Option K configures the electrically isolated double outputs
to the alternative pinout with outputs connected in series
(Vo+/Go/Vo–) and common ground.
However instead of using units with option K, it is recom-
mended to use the standard double output units by provid-
ing the printed circuit board with an additional pin hole (for
pin 12 of double output units) connected to pin hole 13. This
will provide more design-in flexibility since by that both
pinouts may be used on the same PCB.
Option i
Inhibit
Excludes shut down and option K.
The output(s) of the converter may be enabled or disabled
by means of a logic signal (TTL, CMOS, etc.) applied to the
inhibit pin. No output voltage overshoot will occur when the
unit is turned on. If the inhibit function is not required the
inhibit pin should be connected to Vi– to enable the output
(active low logic, fail safe).
Converter operating: –10 V...0.8 V
Converter inhibited
or open inhibit pin: 2.4 V...
U
i max
Fig. 34
If the inhibit is not used the inhibit pin should be con-
nected to Vi–
Vi+
Vi–
i
06070
Option R
R Input and Magnetic Feedback
R specifies magnetic feedback from the output for closer
regulation of the output voltages of double output and sin-
gle output synchronous rectification units. It is especially
suited for applications where the two outputs are either
connected in parallel or in series to form one strong and
tight regulated output. It enables the adjustment of the out-
put voltages via the R-input on the secondary side by an
external resistor or an external voltage source in the range
of approximative 80...105% of
U
o nom. Option R excludes
the Trim input (see also table:
Pin allocation
), option K as
well as the possibility to operate several converters with the
outputs connected in parallel.
1.2
1.0
0.8
0.6
0.4
020
–20 60
0.2
40 80
P
o
/
P
o max
T
A
[°C]
–40 0
11047
Fig. 33
Maximum allowed output power versus ambient tempera-
ture.
Description of Options
Table 18: Survey of options
Option Function of option Characteristic
–8 Extended operational ambient temperature range
T
A = –40...85°C
R Input and magnetic feedback
G Synchronous rectification
K Alternativ pinout
i Inhibit
C C-pinout
L Surface mount version with PCB lid
Z Open frame
