IMS7 Series Data Sheet, 7-Watt DC-DC Converters
Wide input voltage ranges up to 75 V DC
1 or 2 outputs up to 48 V DC
1500 V DC I/O electric strength test voltage
•
RoHS lead solder exemption compliant
•
Electrical isolation, single and double output units
•
High efficiency (typ. 84%)
•
Emissions below EN 55 022 level B
25.4
1.0"
50.8
2.0"
10.5
0.42"
•
Immunity to IEC/EN 61000-4-2, -3, -4, -5 and -6
•
Inhibit input, output voltage adjustable
• Flex power: Flexible load distribution
•
No load and short-circuit proof
•
Operating ambient temperature range –40...71°C
•
High reliability and no derating
•
2" x 1" case with 10.5 mm profile
• Supplementary insulation
Safety according to IEC/EN 60950, UL 1950
LGA
Description
The IMS7 Series of board mountable 7 watt DC-DC
converters has been designed according to the latest
industry requirements and standards. The converters are
particularly suitable for use in industry or tele-
communications where variable input voltages or high
transient voltages are prevalent.
Providing two wide input voltage ranges, 14 to 36 V DC and
36 to 75 VDC, models are available with single and
electrically isolated double outputs allowing the
configuration of output voltages from 3.3 up to 48 VDC
externally adjustable, with flexible load distribution on
double output units. An inhibit input allows remote
converter on/off.
Features include efficient input and output filtering with
unsurpassed transient and surge protection, low output
ripple and noise, consistently high efficiency over the entire
input voltage range, high reliability as well as excellent
dynamic response to load and line changes.
The converters provide supplementary insulation with
SELV outputs as required in battery supported systems
where the bus voltage may exceed the SELV limit of
60 VDC. They 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, 2" x 1" with
10.5 mm profile.
The circuit comprises of integrated planar magnetics and
all components are automatically assembled and solidly
soldered onto a single PCB without any wire connections.
Magnetic feedback ensures maximum reliability and
repeatability 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.
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) ............................ 10
Immunity to Environmental Conditions ........................... 11
Mechanical Data ............................................................ 12
Safety and Installation Instructions ................................ 13
Description of Options .................................................... 14
Accessories .................................................................... 14
Description ....................................................................... 1
Type Survey and Key Data ............................................... 2
Type Key ........................................................................... 2
Functional Description ..................................................... 3
Electrical Input Data ......................................................... 4
Electrical Output Data ...................................................... 6
Auxiliary Functions ........................................................... 8
APR 20, 2006 revised to JUN 05, 2006
Page 1 of 14
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IMS7 Series Data Sheet, 7-Watt DC-DC Converters
Model Selection
Table 1: Type survey
Output 1
V
o nom
I
o nom 1
[VDC]
[A]
3.3
5.1
12
15
5
12
15
24
1
Output 2
V
o nom
I
o nom 1
[VDC]
[A]
-
-
-
-
5
12
15
24
-
-
-
-
0.7
0.3
0.24
0.15
Output
power
P
o nom
[W]
5
6.1
7.2
7.2
7
7.2
7.2
7.2
Input voltage range and efficiency
V
i min
to
V
i max
η
typ
V
i min
to
V
i max
14 to 36 VDC
[%]
36 to 75 VDC
24IMS7-03-9
24IMS7-05-9
24IMS7-12-9C
24IMS7-15-9C
24IMS7-05-05-9
24IMS7-12-12-9
24IMS7-15-15-9
24IMS7-24-24-9
79
81
84
84
83
84
84
84
48IMS7-03-9
48IMS7-05-9
48IMS7-12-9C
48IMS7-15-9C
48IMS7-05-05-9
48IMS7-12-12-9
48IMS7-15-15-9
48IMS7-24-24-9
Options
η
typ
[%]
79
82
84
84
83
84
84
84
M,L,Z
M,L,Z
L,Z
L,Z
M,L,Z
M,L,Z
M,L,Z
M,L,Z
1.5
1.2
0.6
0.48
0.7
0.3
0.24
0.15
Flexible load distribution on double outputs possible.
Model numbers highlighted in yellow or shaded are not recommended for new designs.
Part Number Description
24 IMS 7 - 05 - 05 -9 M L Z
Input voltage range
V
i
14 to 36 VDC ............................................. 24
36 to 75 VDC ............................................. 48
Series ......................................................................... IMS7
Output voltage type for output 1 ............. 03, 05, 12, 15, 24
Dash: Designates double output unit with two indepen-
dent galvanically isolated outputs ................. -
Output voltage type for output 2 ................... 05, 12, 15, 24
Operating ambient temperature range
T
A
–40 to 71°C ................................................ -9
Options:
Surface-mount version with pins ................. M
Surface-mount version with PCB lid ............ L
Open frame .................................................. Z
1
Example:
48IMS7-05-05-9M: DC-DC converter, input voltage range 36 to 75 V, 2 galvanically isolated outputs each
providing 5 V, 700 mA, surface mount version.
APR 20, 2006 revised to JUN 05, 2006
Page 2 of 14
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IMS7 Series Data Sheet, 7-Watt DC-DC Converters
Functional Description
The IMS 7 DC-DC modules are feedback controlled flyback
converters using current mode PWM (Pulse Width Modula-
tion).
In the case of the single output units the output is directly
monitored and fed back to the primary control circuit via a
pulse transformer, resulting in tight regulation of the output
voltage. The R input is referenced to the secondary side
and allows for programming of the output voltages in the
range 75 to 105% of
U
o nom
using either an external resistor
or an external voltage source.
In the case of the double output units the output voltage is
monitored by a separate transformer winding close to the
secondary windings and fed back to the control circuit. The
R-input is referenced to the primary side and allows pro-
gramming of the output voltage in the range 100 to 105% of
U
o nom
by an external resistor or within 75 to 105% of
U
o nom
using an external voltage source.
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 double output types).
The inhibit input allows remote converter shutdown.
03026
03025
Vi+
1
11
Vo+
Vi+
1
11
Vo1
PWM
i
3
10
(Trim)
4
R
10
Vo1
Vo–
2
×
2200 pF
1500 V
Vi–
2
13
R
12
PWM
10 nF
13
Vo2
i
3
Vi–
2
2
×
2200 pF, 1500 V
12
Vo2
14
n.c.
n.c.
4
14
n.c.
Fig. 1
Block diagram, single output types, standard pinout
Fig. 2
Block diagram, double output types, standard pinout
APR 20, 2006 revised to JUN 05, 2006
Page 3 of 14
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IMS7 Series Data Sheet, 7-Watt DC-DC Converters
Electrical Input Data
General conditions:
– T
A
= 25°C, unless
T
C
is specified.
– Connector pins i and Vi– interconnected.
– R input not connected.
Table 2: Input Data
Input
Characteristics
Conditions
min
14
24
50
0.25
0.5
0.1
5
12
12
0.8
–10 to 0.8
open, 2.4 to
V
i max
–0.5
1
3.0
4.0
approx. 330
40
B
B
3.9
approx. 330
30
24
5
12
6
0.5
–10 ...0.8
open, 2.4...U
i max
–0.5
1
3.0
A
kHz
mA
pp
mA
12
mA
μF
V DC
0.25
24 IMS
typ
max
36
min
36
48
100
0.5
0.1
ms
s
48 IMS
typ
max
75
Unit
V DC
V
i
V
i nom
V
i sur
t
start up
t
rise
Input voltage range
1
Input voltage (nominal)
Repetitive surge
voltage
Converter
2
start-up time
Rise time
2
switch on
inh. release
T
A min
to
T
A max
I
o
= 0...I
o nom
Abs. max input (3 s)
Worst case condition at
V
i min
and full load
V
i nom
,
I
o
=
I
o nom
resistive load
capacitive load
I
io
C
i
V
ih
I
ih
I
i ih
I
inr p
f
s
I
i rr
V
i RFI
1
No load input current
Input capacitance
Inhibit voltage
I
o
= 0,
V
i min
to
V
i max
for surge calculation
Converter operating
Converter inhibited
Inhibit current
Converter operating
Converter inhibited
Input current
if unit inhibited
Peak inrush current
4
Switching frequency
Reflected ripple current
Input RFI level
conducted and radiated
V
i
min
to
V
i max
V
i
=
V
nom
V
i min
toV
i max
,
I
o
= 0 to
I
o nom
I
o
= 0 to
I
o nom
EN 55022
3
2
3
4
5
U
i min
will not be as stated if
U
o
is increased above
U
o nom
by use of the R input pin. If the output voltage is set to a higher value,
U
i min
will be proportionally increased.
Measured with a resistive or max. admissible capacitive load. (See fig.:
Converter start-up and rise time).
Measured with a lead lenght of 0.1 m, leads twisted. Double output units with both outputs in parallel.
Source impedance according to ETS 300132-2.
The level of the switching frequency band varies with the output voltage configuration. (See also fig.:
Switching frequency versus input
voltage and load.)
V
o
V
o nom
t
rise
04008
t
start up
t
Fig. 3
Converter start-up and rise time
APR 20, 2006 revised to JUN 05, 2006
Page 4 of 14
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IMS7 Series Data Sheet, 7-Watt DC-DC Converters
Input Transient Voltage Protection
In many applications transient voltages on the input of the
converter are always possible. These may be caused for ex-
ample be short circuits between Vi+ and Vi– where the net-
work inductance may cause high energy pulses.
In order to protect the converter a large transient voltage
supressor has been fitted to the input of the IMS7 types.
Specifications as per table below.
Reverse Polarity Protection at Input
The suppressor diode on the input also provides for reverse
polarity protection by conducting current in the reverse di-
rection, thus protecting the unit. An external fuse is required
to limit this current:
– For 24 IMS 7 a fast 2 A (F2A) fuse is recommended.
– For 48 IMS 7 a fast 1 A (F1A) fuse is recommended.
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.
1 A/Div.
4
3
04030
Table 3: Built-in transient voltage suppressor
Type
Breakdown
Voltage
V
BR nom
53 V
100 V
Peak Power
at 1 ms
P
P
600 W
600 W
Peak Pulse
Current
I
PP
7.7 A
4.1 A
24IMS7
48IMS7
If transients generating currents above the peak pulse cur-
rent
I
pp
are possible then an external limiting network such
as the circuit recommended for IEC 801-5, level 2 compli-
ance is necessary.
To achieve IEC/EN 61000-4-5, level 2 compliance an addi-
tional inductor and capacitor should be provided externally
as shown in the figure below. The components should have
similar characteristics as listed in table 9.
To withstand the 150 V transient according to 19 Pfl 1, appli-
cable for 48 IMS 7 types, the same external circuitry with
similar components as for IEC/EN 61000-4-5, level 2 com-
pliance can be used.
L
V+
C
V–
+
Vi+
i
Vi–
Module
04043
2
1
0
10
μs/Div.
Fig. 6
Typical inrush current at U
i nom
, P
o nom
versus time
(48 IMS 7) measured according to prETS 300132-2 (Ver-
sion 4.3)
Fig. 4
Example for external circuitry to comply with
IEC/EN 61000-4-5, level 2.
Table 4: Components for external circuitry to comply with
IEC/EN 61000-4-5
Circuit Ref.
L
C
24IMS7
48IMS7
330
μH,
0.42
Ω,
0.6 A
330
μH,
0.42
Ω,
0.6 A
TDK TSL1110-331KR55 TDK TSL1110-331KR55
68
μ,
63 V, 85°C
68
μF,
100 V, 85°C
04029
5
5
10.5
∅
0.7
Fig. 5
Dimensions for inductor L
11.5
APR 20, 2006 revised to JUN 05, 2006
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