Board Mountable
DC-DC Converters
IMP 3 Series
3 Watt DC-DC Converters
Input voltage range up to 72 V DC
1 or 2 outputs up to 30 V DC
1500 V DC I/O electric strength test voltage
•
Input voltage range up to 4:1
•
High efficiency up to 75%
•
Short-circuit proof
•
No derating
•
DIL 24 plastic package
•
Low cost
IMP 3 Series
IXP 3 Series
32
1.26"
12
0.47"
20
0.79"
Summary
The IMP 3 series of DC-DC converters have been devel-
oped for powering commercial type of electronic circuits,
e.g. telephone systems components, industrial controllers
and small appliances, featuring short-circuit protection and
input to output isolation. With a good efficiency as well as
good dynamic response to load changes and at start-up,
the IMP 3 series is the best solution for applications where
high reliability and high performance for a low price is re-
quired.
Type Survey and Key Data
Table 1: Type survey
Output 1
Output 2
Output power
T
A
= 71°C
P
o max
[W]
2.5
2.5
3
3
3
3
2.5
2.5
2.5
2.5
3
3
3
3
3
3
3
3
Input voltage
Effic.
1
η
min
[%]
67
68
68
73
68
73
66
72
66
72
68
72
68
72
68
75
68
75
Type designation Type designation Options
2
I/O electric strength I/O electric strength
test 1500 V DC
test 3500 V DC
24 IMP 3-05-7
48 IMP 3-05-7
24 IMP 3-12-7
48 IMP 3-12-7
24 IMP 3-15-7
48 IMP 3-15-7
24 IMP 3-05-05-7
48 IMP 3-05-05-7
24 IMP 3-0505-7
48 IMP 3-0505-7
24 IMP 3-12-12-7
48 IMP 3-12-12-7
24 IMP 3-1212-7
48 IMP 3-1212-7
24 IMP 3-15-15-7
48 IMP 3-15-15-7
24 IMP 3-1515-7
48 IMP 3-1515-7
24 IXP 3-05-7
48 IXP 3-05-7
24 IXP 3-12-7
48 IXP 3-12-7
24 IXP 3-15-7
48 IXP 3-15-7
24 IXP 3-05-05-7
48 IXP 3-05-05-7
24 IXP 3-0505-7
48 IXP 3-0505-7
24 IXP 3-12-12-7
48 IXP 3-12-12-7
24 IXP 3-1212-7
48 IXP 3-1212-7
24 IXP 3-15-15-7
48 IXP 3-15-15-7
24 IXP 3-1515-7
48 IXP 3-1515-7
S
S
S
S
S
S
-
-
S
S
-
-
S
S
-
-
S
S
U
o nom
[V]
5
5
12
12
15
15
5
5
+5
+5
12
12
+12
+12
15
15
+15
+15
1
2
I
o nom
[mA]
500
500
250
250
200
200
250
250
250
250
125
125
125
125
100
100
100
100
U
o nom
[V]
-
-
-
-
-
-
5
5
–5
–5
12
12
–12
–12
15
15
–15
–15
I
o nom
[mA]
-
-
-
-
-
-
250
250
250
250
125
125
125
125
100
100
100
100
U
i
[V DC]
9...36
18...72
9...36
18...72
9...36
18...72
9...36
18...72
9...36
18...72
9...36
18...72
9...36
18...72
9...36
18...72
9...36
18...72
Efficiency at
U
i nom
and
I
o nom
.
Option: standard pin-out (industrial)
Table of Contents
Page
Page
Auxiliary Function ............................................................. 4
Electromagnetic Compatibility (EMC) .............................. 5
Immunity to Environmental Conditions ............................. 5
Mechanical Data .............................................................. 5
Safety and Installation Instructions .................................. 6
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 1
Type Key .......................................................................... 2
Functional Description ...................................................... 2
Electrical Input Data ......................................................... 3
Electrical Output Data ...................................................... 3
Edition 4/04.2001
1/6
Board Mountable
Type Key
Type Key
DC-DC Converters
IMP 3 Series
24 IMP 3 - 12 12 -7 S
Nominal input voltage in volt .................................... 24, 48
Serie ..................................................................... IMP, IXP
Nominal output power in watt ........................................... 3
Nominal output voltage for output 1 in volt .............. 05...15
Nominal output voltage for output 2 in volt .............. 05...15
Operating ambient temperature range
T
A
–25...71°C .................................................. -7
Option:
Industry standard pinout .............................. S
Functional Description
SD
20
03029
SD
20
03030
Vi+
1
2
13
Vi+
1
2
15
Vo+
Vo+
COM
Ref.
10
11
Control
Vi–
23
24
Ref.
23
24
Control
12
Vo–
Vi–
13
Vo–
Fig. 1
Single output converter block diagram with alternative
pinout
SD
20
03031
Fig. 2
Dual output converter block diagram with alternative
pinout
03032
Vi+
1
2
13
Vo2
Go2
Vo1
Vi+
22
23
14
Vo+
Ref.
Control
23
24
9
16
12
Control
Vi–
2
3
Ref.
Vi–
16
Vo–
Go1
Fig. 3
Double output converter block diagram
Fig. 4
Single output converter block diagram with industry stand-
ard pinout (option S)
03033
Vi+
22
23
14
Vo+
COM
Ref.
Control
2
3
9
16
Vi–
11
Vo–
Fig. 5
Dual output converter block diagram with industry stand-
ard pinout (option S)
Edition 4/04.2001
2/6
Board Mountable
Electrical Input Data
DC-DC Converters
IMP 3 Series
General condition:
T
A
= 25°C unless otherwise specified
Table 2: Input data
Input
Characteristics
Conditions
24 IMP/IXP 3
min
9
24
0
40
12
1.25
P
i nom
shunt diode
use external fuse
open or 8...10
–0.3...2
1...5
–25...–45
0
8
1.25
P
i nom
shunt diode
use external fuse
open or 8...10
–0.3...2
1...5
–25...–45
µA
V DC
typ
max
36
48 IMP/IXP 3
min
18
48
75
mA
W
typ
max
72
Unit
V DC
U
i
U
i nom
U
i abs
I
i 0
I
i L
U
i rev
U
SD
I
SD
Operating input voltage
Nominal input voltage
Input voltage without
damage
No load input current
Input current limitation
response
Reverse input voltage
protection
Shut down voltage
T
A min
...
T
A max
,
I
o
= 0...
I
o nom
U
i nom
,
I
o
= 0
U
i nom
, full load
U
i
= negative or
reverse polarity
operating
not operating
Shut down current
operating
not operating
Electrical Output Data
General condition:
T
A
= 25°C unless otherwise specified
Table 3a: Output data for single output types
Output
Characteristics
Conditions
.. IMP/IXP 3-05
min
4.90
typ
5
500
400
400
100
±1
±2
±0.02
50
50
±2
±0.02
50
max
5.10
.. IMP/IXP 3-12
min
11.76
typ
12
250
200
200
100
±1
±2
±0.02
%/K
kHz
max
12.24
.. IMP/IXP 3-15
min
14.70
typ
15
200
150
150
100
±1
max
15.30
Unit
V
mA
U
o
I
o nom
Output voltage
Nominal output current:
24 IMP 3
48 IMP 3
Output voltage noise
(BW = 20 MHz)
Static line regulation
Static load regulation
Temperature coefficient
Switching frequency
U
i nom
,
I
o nom
U
i
= 9...11 V DC
U
i
= 18...21 V DC
U
i nom
(0.2...1)
I
o nom
u
o
D
U
o U
D
U
o I
a
Uo
mV
pp
%
U
i min
...
U
i max
,
I
o nom
U
i nom
, (0...1)
I
o nom
U
i nom
, I
o nom
f
s
Table 3b: Output data for dual output types
Output
Characteristics
Conditions
.. IMP/IXP 3-0505
min
±4.90
typ
±5
±250
±200
±200
150
300
±1
±3
±0.02
50
50
±3
±0.02
50
max
±5.10
.. IMP/IXP 3-1212
min
typ
±125
±100
±100
150
300
±1
±3
±0.02
%/K
kHz
max
±11.76 ±12 ±12.24
.. IMP/IXP 3-1515
min
typ
±100
±80
±80
150
300
±1
max
Unit
V
mA
±14.70 ±15 ±15.30
U
o
I
o nom
Output voltage
Nominal output current:
24 IMP 3
48 IMP 3
Output voltage noise
1
(BW = 20 MHz)
Static line regulation
Static load regulation
Temperature coefficient
Switching frequency
U
i nom
,
I
o nom
U
i
= 9...11 V DC
U
i
= 18...21 V DC
U
i min
...
U
i max
(0.2...1)
I
o nom
U
i min
...
U
i max
,
I
o nom
U
i nom
(0.2...1)
I
o nom
u
o
D
U
o U
D
U
o I
a
Uo
mV
pp
%
U
i nom
, I
o nom
f
s
1
Output voltage noise with option S (standard pin-out) = 300 mV
pp
Edition 4/04.2001
3/6
Board Mountable
Table 3c: Output data for double output types
Output
Characteristics
Conditions
DC-DC Converters
IMP 3 Series
.. IMP/IXP 3-05-05
min
2
×
4.90
Nominal output current:
24 IMP 3
48 IMP 3
Output voltage noise
(BW = 20 MHz)
Static line regulation
Static load regulation
Temperature coefficient
Switching frequency
typ
2
×
5
2
×
5.10
2
×
250
2
×
200
2
×
200
150
±1
±3
±0.02
50
max
.. IMP/IXP 3-12-12
min
typ
2
×
12
2
×
11.76
2
×
125
2
×
100
2
×
100
150
±1
±3
±0.02
50
max
.. IMP/IXP 3-15-15
min
typ
2
×
15
2
×
15.30
mA
2
×
100
2
×
80
2
×
80
150
±1
±3
±0.02
50
%/K
kHz
max
Unit
V
U
o nom
U
o
I
o nom
Output voltage
U
i nom
,
I
o nom
2
×
12.24 2
×
14.70
U
i
= 9...11 V DC
U
i
= 18...21 V DC
U
i min
...
U
i max
(0.2...1)
I
o nom
U
i min
...
U
i max
,
I
o nom
U
i nom
, (0.2...1)
I
o nom
U
i nom
, I
o nom
u
o
D
U
o U
D
U
o I
a
Uo
mV
pp
%
f
s
Thermal Considerations
If a converter is operated, the relationship between the am-
bient temperature
T
A
and the case temperature
T
C
depends
heavily on the conditions of operation and integration into a
system. The thermal conditions are influenced by input volt-
age, output current, airflow, temperature of surrounding
components and surfaces and the properties of the printed
circuit board. The specified maximum ambient temperature
T
A max
is therefore only an indicative value and under practi-
cal 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 speci-
fied maximum value. The installer must ensure that un-
der all operating conditions
T
C
remains within the limits
stated in the table:
Temperature specifications.
Connection in Series
The outputs of one or more units can be connected in se-
ries. No suppressor diodes are required. Power-One how-
ever recommends to protect each individual output with a
Zener diode or preferably a suppressor diode, to avoid re-
verse polarity that may occur if the output voltages do not
rise simultaneously.
Connection in Parallel
Connecting the outputs of two or more converters in paral-
lel is not recommended due to uneven power distribution
among the outputs.
Protection Scheme
The IMP series is continuously short circuit protected by
means of input power limitation. The unit will not be dam-
aged if started up into a short circuit. After removal of the
short circuit, it will resume normal operation.
The IMP series is also no-load proof, meaning that the
regulation is still effective with no load and the output volt-
age does not rise. However, due to component tolerances,
oscillation could occur and ripple and noise can be outside
of specified values. If the converter is used in senitive elec-
tronic circuits with no-load conditions, it is recommended to
pre-load the outputs with at least 20% of the specified nomi-
nal load.
Auxiliary Function
SD-input
The output voltage is turned on if the pin 20 is open or a
voltage of 8...10 V DC is applied. If the voltage at pin 20 is
between –0.3 and 2 V DC, the output voltage is turned off.
The maximum voltage without damage is limited to 20 V
and the maximum allowed current is limited to 3 mA.
Edition 4/04.2001
4/6
Board Mountable
DC-DC Converters
IMP 3 Series
Electromagnetic Compatibility (EMC)
07025
Filter recommendations for compliance with
CISPR 22/EN 55022, class B
Electromagnetic emission requirements according to EN
55022, class B can be easely achieved by adding an exter-
nal input filter consisting of three additional capacitors and
one common mode ring core choke.
The filter components should be placed as close as possi-
ble to the input of the converter.
C
1
C
2
L
1
Vi+
C
i
Vi–
Fig. 6
Input filter arrangement
Table 4: Input filter components
Input voltage
24, 48 V DC
C
1
2.2
µF
1
100 V
C
2
2.2
µF
1
100 V
Type
Siemens
B 32522
C1225-K
L
1
2.2 mH
Type
Siemens
B 82722
A2202-N1
C
i
4.7
µF
100 V
Type
Al-Chip
(low ESR)
1
Only valid for input voltages up to 60 V DC.
Immunity to Environmental Conditions
Thermal Considerations
Table 5: Temperature specifications, valid for air pressure of 800...1200 hPa (800...1200 mbar)
Temperature
Characteristics
Conditions
Standard -7
min
–25
–25
–40
max
71
90
100
Unit
°C
T
A
T
C
T
S
Ambient temperature
Case temperature
Storage temperature
U
i nom.
I
o
= 0 ...
I
o nom.
Non operational
Table 6: MTBF
Values at specified case temperature
MTBF according to MIL-HDBK-217F, N2
Ground Benign
40°C
3'759'000 h
Ground Fixed
40°C
715'000 h
70°C
275'000 h
Ground Mobile
50°C
289'000 h
Mechanical Data
Dimensions in mm. Tolerances
±0.3
mm unless otherwise specified.
min. 33.8
31.8
2.54
09034
European
Projection
1
mounting space
required
Measuring point
of case temperature
T
C
Fig. 7
Case: DIL 24
Weight: 16 g
Edition 4/04.2001
min. 3
ø 0.5
12
min. 22.3
15.24
20.3
5/6
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