Board Mountable
DC-DC Converters
IMY 35 Series
35 Watt DC-DC Converters
Input to output electric strength test up to 2.5 kV DC
Input voltage: 60...150 V DC
2, 3 and 4 outputs
Configurable output voltages from 5 to 60 V DC
• 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
• Programmable input undervoltage lock-out
• Shut down input
• Output voltages adjustable with flexible load distribu-
tion
• Frequency synchronisation
• Outputs no-load, overload and short-circuit proof
• Operating ambient temperature up to –40...85
°
C
• Thermal protection
• 3"
×
2,5" case with 10.5 mm profile or 8.9 mm open
frame
• Double or reinforced insulation
IMY 35 Series
63.5
2.5"
10.5
0.41"
76.2
3"
47.8
1.88"
8.9
0.35"
72.8
2.87"
Safety according to IEC/EN 60950, UL 1950
LGA
Approvals pending
Summary
The IMY 35 series of board mountable 35 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, railways, industry, or telecommunication where
variable input voltages or high transient voltages are preva-
lent.
With a total input voltage range from 60...150 V, the units
are available with double and quadruple outputs, electri-
cally isolated, from 5 V up to 60 V externally adjustable and
with flexible load distribution. 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 circuit comprises of two planar magnetics devices and
all components are automatically assembled and solidly
soldered onto a single PCB without any wire connection.
Magnetic feedback ensures maximum reliability and
repeatability in the control loop over all operating condi-
tions. Careful considerations of possible thermal stresses
ensure the absence of hot spots providing long life in envi-
ronments where temperature cycles are a reality. The ther-
mal design without using any potting material allows opera-
tion at full load up to an ambient temperature of 71°C in free
air. For extremely high vibration environments the case has
holes for screw mounting. Various options as e.g. extended
temperature range –40...85°C or an alternative pinout pro-
vide a high level of application specific engineering and de-
sign-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 ...................................................... 6
Edition 2/5.2000
Page
Auxiliary Functions ........................................................... 9
Electromagnetic Compatibility (EMC) ............................ 10
Immunity to Environmental Conditions .......................... 11
Mechanical Data ............................................................ 12
Safety and Installation Instructions ................................ 13
Description of Option ..................................................... 15
1/15
Board Mountable
Type Survey and Key Data
Table 1: Type survey
Output 1
U
o nom
I
o nom
[V DC]
[A]
5
12
15
5
12
15
2.8
1.4
1.2
1.4
0.7
0.6
Output 2
U
o nom
I
o nom
[V DC]
[A]
5
12
15
5
12
15
2.8
1.4
1.2
1.4
0.7
0.6
Output 3
U
o nom
I
o nom
[V DC]
[A]
-
-
-
5
12
15
-
-
-
1.4
0.7
0.6
DC-DC Converters
IMY 35 Series
Output 4
U
o nom
I
o nom
[V DC]
[A]
-
-
-
5
12
15
-
-
-
1.4
0.7
0.6
Input voltage
U
i min
...U
i max
[V DC]
60...150
60...150
60...150
60...150
60...150
60...150
Eff.
h
typ
[%]
84
86
86
87
89
89
Type
designation
110 IMY 35-05-05-9
110 IMY 35-12-12-9
110 IMY 35-15-15-9
Trim
Opt.
primary -8, Z, i
primary -8, Z, i
primary -8, Z, i
110 IMY 35 D05D05-9 primary -8, Z, i
110 IMY 35 D12D12-9 primary -8, Z, i
110 IMY 35 D15D15-9 primary -8, Z, i
Trim
The Trim input on the primary side (Trim, pin 5) influences all outputs.
Type Key
Dual output units
Input voltage range
U
i
60...150 V DC .......................................... 110
Series ...................................................................... IMY 35
Output 1 of double types .................................... 05, 12, 15
Output 2 of double types .................................... 05, 12, 15
Operating ambient temperature range
T
A
–40...71°C (standard) ................................. -9
–40...85°C (option) ..................................... -8
Options:
Inhibit ............................................................ i
Open frame .................................................. Z
110 IMY 35 D05 D05 -9 i Z
110 IMY 35 - 12 - 12 -9 i Z
Quad output units
Input voltage range
U
i
60...150 V DC .......................................... 110
Series ...................................................................... IMY 35
Output 1 and 4 of quad types ..................... D05, D12, D15
Output 2 and 3 of quad types ..................... D05, D12, D15
Operating ambient temperature range
T
A
–40...71°C (standard) ................................. -9
–40...85°C (option) ..................................... -8
Options:
Inhibit ............................................................ i
Open frame .................................................. Z
Edition 2/5.2000
2/15
Board Mountable
Functional Description
DC-DC Converters
IMY 35 Series
The IMY 35 family of DC-DC converters consists of two
feedback controlled interleaved switching flyback power
trains using current mode PWM (pulse width modulation).
Functionally the converters are of two main types. The dual
output types consist of two electrically isolated outputs Vo1,
Vo2. Vo1 and Vo2 derives from two power trains and are
electrically isolated. Voltage regulation for each output is
achieved with passive transformer feedback from the main
transformer of each power train. Adjustment of the outputs
voltages in the range of 80...105% of
U
o nom
is possible via
Trim input on the primary side (See:
Block diagram, dual
output types.)
The quadruple output type consists of 4 outputs and two
power trains. Vo1, Vo4 derive from the first power train and
Vo2, Vo3 from the second one (thus each pair of outputs is
independent from the other one). Voltage regulation for
each pair of outputs is achieved with passive transformer
feedback from the main transformer of each power train.
Vi+
4
PUL
1
Trim/n.c.
5
W
6
Ref
7
SD
8
Vi—
2
n.c.
3
PWM
Each pair of outputs are restricted to being of the same out-
put voltage type (i.e. D05, D12, etc.). If both power trains
have the same output voltage, all outputs may be adjusted
by means of the Trim input. (In case of different output volt-
ages, the Trim1 input influences only Vo1 and Vo4. See:
Block diagram, quadruple output types.)
Current limitation is provided by the primary circuit for each
power train and limits the possible output power for each
pair of outputs. In the case of an overload on either of the
power trains which causes the output voltage to fall less
than typically 60% of
U
o nom
, the entire converter will shut
down and automatically restart in short intervals.
Overtemperature protection is provided for each power
train which will shut down the converter in excessive over-
load conditions with automatic restart approximately in
short intervals.
03100
17
Vo1+
15
Vo1—
18
Trim1/n.c.
12
n.c.
13
Vo2+
14
n.c.
11
Vo2—
19
n.c.
16
n.c.
Fig. 1
Block diagram 1, double output types
03098
Vi+
4
PUL
1
Trim
5
W
6
Ref
7
SD
8
Vi—
2
n.c.
3
PWM
16
Vo1+
15
Vo1—
17
Vo4+
18
Vo4—
13
Vo2+
14
Vo2—
12
Vo3+
11
Vo3—
19
n.c.
Fig. 2
Block diagram 3, quadruple output types
Edition 2/5.2000
3/15
Board Mountable
Electrical Input Data
DC-DC Converters
IMY 35 Series
General conditions:
– T
A
= 25°C, unless
T
C
is specified.
– Shut down pin left open circuit (not connected).
– Trim not connected.
Table 2: Input Data
Input
Characteristics
Conditions
min
60
2
110
168
0.25
0.5
0.1
5
10
20
10
20
10
0.35
–10...0.7
A
µF
V DC
mA
ms
s
110 IMY
typ
max
150
Unit
V DC
U
i
U
i nom
U
i sur
t
start up
t
rise
I
i o
I
irr
I
inr p
C
i
U
SD
R
SD
I
SD
f
s
u
i RFI
1
Input voltage range
1
Nominal input voltage
Repetitive surge voltage
Converter
Switch on
start-up time
2
SD high
Rise time
3
T
A min
...T
A max
I
o
= 0...I
o nom
Abs. max input (3 s)
Worst case condition at
U
i min
and full load
U
i nom
resist load
I
o nom
capac. load
I
o
= 0,
U
i min
...U
i max
I
o
= 0...I
o nom
U
i
=
U
i nom
for surge calculation
Unit shut down
Unit operating
No load input current
Reflected ripple current
Inrush peak current
4
Input capacitance
Shut down voltage
Shut down input resistance
Input current if unit
shut down
Switching frequency
Input RFI level, conducted
For current calculations
approx. 10
1
approx. 220
B
kΩ
mA
kHz
U
i
min
...U
i max
U
i min
...U
i max
,
I
o
= 0...I
o nom
EN 55022
5
2
3
4
5
U
i min
will not be as stated if
U
o
is increased above
U
o nom
by use of Trim input. If the output voltage is set to a higher value,
U
i min
will be proportionately increased.
Input undervoltage lock-out at typ. 90% of
U
i min
.
Measured with resistive and max. admissible capacitive load.
Source impedance according to prETS 300132-2, version 4.3.
Measured with a lead length of 0.1 m, leads twisted.
Edition 2/5.2000
4/15
Board Mountable
Inrush current
DC-DC Converters
Input Transient Voltage Protection
IMY 35 Series
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]
4
3
2
1
t
[µs]
0
10
20
30
40
50
60
70
80
90 100
04022
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 4: Built-in transient voltage suppressor
Type
Breakdown
voltage
V
Br nom
[V]
167
Peak power
at 1 ms
P
p
[W]
600
Peak pulse
current
I
pp
[A]
0.5
110 IMY 35
Fig. 3
Typical inrush current at U
i nom
, P
o nom
versus time. Source
impedance according to prETS 300132-2, version 4.3 at
U
i nom
.
U
o
U
o nom
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.
Table 5: Components for external circuitry for IEC/EN
61000-4-5, level 2 or ETR 283 (19Pfl1) compliance.
t
rise
04008
Type
110 IMY 35
Inductor (L)
L = 560
µH/0.84
A
OCR = 0.38
Ω
L
Vi+
C
+
Vi–
Capacitor (C)
2 x 100
µF/200
V
t
start up
t
04063
Fig. 4
Converter start-up and rise time
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.
Fig. 5
Example for external circuitry to comply with IEC/EN
61000-4-5 or ETR 283 (19Pfl1).
22
04052
Table 3: Recommended external fuses
Converter type
110 IMY 35
Fuse type
F2.0A
11.5
23.8
Fig. 6
Dimensions of inductor L for 110 IMY 35 types
(e.g. Coil Craft, PCH-45 series).
Edition 2/5.2000
5/15
ST MEMS传感器创意设计大赛专区
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
