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參數(shù)資料
| 型號： | 70IMX7-12-12-8ZG |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 7 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-14 |
| 文件頁數(shù)： | 14/15頁 |
| 文件大?。?/td> | 374K |
| 代理商： | 70IMX7-12-12-8ZG |
BCD20007-G Rev AD, 4-Nov-09
Page 8 of 15
www.power-one.com
IMX7/IMS7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Thermal Considerations
If the converter, mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the maximum ambient
temperature TA max (see table Temperature specifications) and
is operated at nominal input voltage and output power, the
case temperature TC measured at the measuring point of case
temperature (see Mechanical Data) will approach TC max after
the warm-up phase. However, the relationship between TA
and TC depends heavily on the conditions of operation and
integration into a system, such as input voltage, output
current, airflow, temperature of surrounding components and
surfaces, and the properties of the printed circuit board. TA max
is therefore only an indicative value, and under practical
operating conditions, TA may be higher or lower.
Caution: The case temperature TC measured at the measuring
point of case temperature (see Mechanical Data) may under no
circumstances exceed the specified maximum. The installer must
ensure that under all operating conditions TC remains within the
limits stated in the table Temperature specifications.
Fig. 8a
Vo versus Io (typ.) of single-output models with Vo = 5.1 V
Fig. 8b
Vo versus Io (typ.) of double-output models (2
×12 V) with both
outputs in parallel
Short-Circuit Behavior
The current limitation shuts down the converter, when a short
circuit is applied to the output. It acts self-protecting, and
automatically recovers after removal of the overload condition.
Output Overvoltage Protection
The outputs are protected against overvoltage by Zener
diodes. In the event of an overvoltage, the converter will shut
down and attempt to restart automatically. The main purpose
of this feature is to protect against possible overvoltage,
which could occur due to a failure in the feedback control
circuit. The converters are not designed to withstand external
overvoltages applied to the outputs.
Connection in Series or Parallel
The outputs of single- or double-output models can be
connected in series without any precautions, taking into
consideration that the output voltage should remain below 60
V for SELV operation.
Both outputs of double-output models can be connected in
parallel without any precautions. Several converters (single-
or double-output models) with equal output voltage can be put
in parallel and will share their output current quite equally.
However, this may cause start-up problems and is only
recommended in applications, where one converter is able to
deliver the full load current, e.g., in true redundant systems.
Fig. 7
Overload switch-off (hiccup mode).
7
8
9
10
11
12
13
Vo [V]
0.2
0.4
0.6
0.8
Io total [A]
0
05086a
5.5
5.0
4.5
4.0
3.5
3.0
0
0.4
0.8
1.2
1.6
Io [A]
Vo [V]
05087a
1.0
0.8
0.6
0.4
0
0.2
20
40
60
80
100
°C
Po/Po max
JM017
TA
0.5 m/s = 100 LFM
natural cooling
70
100
Vo [%]
t
05041b
0.3 s
overload short-circuit condition
switch-off
0
Fig. 6
Maximum allowed output power versus ambient temperature
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