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參數(shù)資料
| 型號(hào)： | 48IMR3-03-2 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大?。?/td> | 261K |
| 代理商： | 48IMR3-03-2 |
IMR 3 Series
DC-DC Converters <40 Watt
Benign Environment
Edition 4/4.99
4
MELCHER
The Power Partners.
Connection in Parallel
The outputs of several units can be connected in parallel.
However, the use of a single unit with a higher power rating
is a better choice because of uneven power distribution
among the outputs connected in parallel. It is recom-
mended to select converters to be connected in parallel
with very small output voltage differences at full load (i.e.
<
±
0.5%). A decoupling diode is not required but recom-
mended.
Protection Scheme
The IMR 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 IMR 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
nominal load.
Fig. 3
Input filter arrangement
C
1
C
2
L
1
Vi+
Vi
–
C
i
07025
Table 4: Input filter components
Input voltage
C
1
C
2
Type
L
1
Type
C
i
Type
12, 24, 40, 48 V DC
2.2
μ
F
1
100 V
2.2
μ
F
1
100 V
Siemens
B 32522
C1225-K
2.2 mH
Siemens
B 82722
A2202-N1
4.7
μ
F
100 V
Al-Chip
(low ESR)
1
Only valid for input voltages up to 60 V DC.
Electromagnetic Compatibility (EMC)
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 commom mode ring core choke.
The filter components should be placed as close as possi-
ble to the input of the converter.
Table 6: MTBF
Values at specified case temperature
Ground Benign
40
°
C
Ground Fixed
40
°
C
Ground Mobile
50
°
C
MTBF according to MIL-HDBK-217F, N2
3'984'000 h
896'100 h
343'800 h
Immunity to Environmental Conditions
Table 5: Temperature specifications, valid for air pressure of 800...1200 hPa (800...1200 mbar)
Temperature
Characteristics
T
A
Ambient temperature
T
C
Case temperature
T
S
Storage temperature
Standard -2
min
–
10
–
10
–
25
Option -7
Conditions
U
i nom
I
o
= I
o nom
Non operational
max
50
80
85
min
–
25
–
25
–
40
max
71
85
100
Unit
°
C
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
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
Connection in Series
The outputs of one or more units can be connected in se-
ries. No suppressor diodes are required. Melcher however
recommends to protect each individual output with a Zener
diode or preferably a suppressor diode, to avoid reverse
polarity that may occur if the output voltages do not rise si-
multaneously.
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