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| 型号： | PSL486-7LIRPCDA |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 9/11页 |
| 文件大小： | 247K |
| 代理商： | PSL486-7LIRPCDA |
PSL-Family
Switching Regulators 19"
Rugged Environment
5 - 8
Edition 2/96 - Melcher AG
MELCHER
The Power Partners.
5.1
Characteristics and Definitions
Output Protection
A voltage suppressor diode protects the output against an
internally generated overvoltage, which could occur due to
a failure of the control circuit, which in worst case condi-
tions fails into a short circuit. The suppressor diode is not
designed to withstand externally applied overvoltages. The
user should ensure that systems with Melcher power sup-
plies, in the event of a failure, do not result in an unsafe
condition (fail-safe).
Dynamic Characteristics
Fig. 3
Behaviour and characteristics under varying load condi-
tions.
Temperature
When a converter is located in free, quasi-stationary air at a
temperature
TA = 71°C and is operated at its nominal output
power, the case temperature
TC will be about 95
°C after the
warm-up phase measured at the measuring point of case
temperature
TC (see "Mechanical Data").
Under practical operating conditions, the ambient tempera-
ture
TA may exceed 71°C, provided additional measures
are taken to ensure that the case temperature
TC does not
exceed its maximum value of 95
°C ( heat sink, fan, etc.).
Example: Sufficient forced cooling allows
TA max = 85 °C. A
simple check of the case temperature
TC (TC ≤ 95°C) at full
load ensures correct operation of the system
0
10
20
30
40
50
60
70
80
–40
50
60
70
80
90
100
Po [%]
TA [°C]
90
100
110
TC max
Po max
(convection cooling)
Po max (forced cooling)
Fig. 4
Output power derating versus ambient temperature
Parallel and Series Connection
Outputs of equal nominal voltages can be parallel-con-
nected. However, the use of a single unit with higher output
power, because of its power dissipation, is always a better
solution.
In parallel-connected operation, one or several outputs may
operate continuously at their current limit knee-point which
will cause an increase of the case temperature. Conse-
quently, the max. ambient temperature value should be re-
duced by 10 K.
Outputs can be series-connected with any other module. In
series-connection the maximum output current is limited by
the lowest current limitation. Galvanically separated source
voltages are needed for each module!
Short circuit behaviour
A constant current limitation circuit holds the output current
almost constant whenever an overload or a short circuit is
applied to the regulator's output. It acts self-protecting and
recovers - in contrary to the fold back method - automati-
cally after removal of the overload or short circuit condition.
1.2
1.0
0.8
0.6
0.4
0
0.2
0.4
1.0
1.2
0.2
0.6
0.8
1.4
Uo/Uo nom
Io/Io nom
I o
nom
Io L
Fig. 5
Overload, short-circuit behaviour Uo versus Io
Io/Io nom
3/3
2/3
1/3
0
t
≥10 s
uod
t r
Uo I
t
Uo
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