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| 型號(hào)： | 110IMX7-12-8C2 |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 7 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 18/18頁(yè) |
| 文件大?。?/td> | 299K |
| 代理商： | 110IMX7-12-8C2 |
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Board Mountable
DC-DC Converters
IMX 7 Series
Edition 6/5.2000
9/18
Short Circuit Behaviour
The current limit characteristic shuts down the converter
whenever a short circuit is applied to its output. It acts self-
protecting and automatically recovers after removal of the
overload condition (hiccup mode).
Thermal Considerations
If a converter, mounted on a pcb, is located in free, quasi-
stationary air (convection cooling) at the indicated maxi-
mum ambient temperature
TA max (see table: Temperature
specifications) and is operated at its nominal input voltage
and output power, the case temperature
TC measured at the
Measuring point of case temperature TC (see: Mechanical
Data) will approach the indicated value TC max after the
warm-up phase. However, the relationship between
TA and
TC depends heavily on the conditions of operation and inte-
gration into a system. The thermal conditions are influenced
by input voltage, output current, airflow, temperature of sur-
rounding components and surfaces and the properties of
the printed circuit board.
TA max is therefore only an indica-
tive value and under practical operating conditions, the am-
bient temperature
TA may be higher or lower than this value.
Caution: The case temperature
TC measured at the
Measuring point of case temperature TC (see: Mechani-
cal Data) may under no circumstances exceed the speci-
fied maximum value. The installer must ensure that un-
der all operating conditions
TC remains within the limits
stated in the table:
Temperature specifications.
Connection in Series or in Parallel
Connection in series:
The outputs of single or double output units can be con-
nected in series without any precautions, taking into consid-
eration that the highest output voltage should remain below
60 V for SELV operation.
Connection in parallel:
The outputs of one or several double output units with equal
nominal voltage can be connected in parallel. Approximate
current sharing between 2 or several units is ensured by
their load dependent output characteristic.
Output overvoltage protection
The outputs of single output units and -05-05- types are
protected against overvoltages by a second control loop. In
the event of an overvoltage on the output the unit will shut-
down and attempt to restart approximately every 0.4 sec-
onds. Double output units (with exception of the -05-05-
types) are protected against overvoltages by a Zener diode
across the second output. Under worst case conditions the
Zener diode will short circuit. Since with double output units
both outputs track each other the protection diode is only
provided in one of the outputs. The main purpose of this fea-
ture is to protect against possible overvoltages which could
occur due to a failure in the feedback control circuit. The
output overvoltage protection is not designed to withstand
externally applied overvoltages.
Fig. 13
Uo1 versus Io1 (typ) for various Io2 (2 × 12 V).
The cross load effect is negligible.
Fig. 11
Uo versus Io (typ) of single output units with Uo = 5.1 V.
Fig. 12
Uo versus Io (typ) of double output units, with both outputs
in parallel.
7
8
9
10
11
12
13
Uo [V]
0.1
0.2
0.3 0.4
0.5
0.6
0.7
0.8 0.9 Io total [A]
0
05086
5.5
5.0
4.5
4.0
3.5
3.0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Io [A]
Uo [V]
05087
Uo1, Uo4 [V]
Io1
Io1 nom
05039
14
13
12
11
10
025
50
75
100
150
[%]
Uo4
Uo1
125
Fig. 14
Flexible load distribution on double outputs (2
× 12 V) with
load variation from 0...150% of Po1 nom on output 1. Output
2 loaded with 25% of Po2 nom.
Typical Performance Curves
11.0
11.5
12.0
12.5
13.0
13.5
Uo1 [V]
0.03
0.10
0.15
0.20
0.25
0.35 Io1 [A]
0.05
05088
Io2 = 0.3 A
Io2 = 0.03 A
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