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參數(shù)資料
| 型號： | PSA121.5-9IR |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 18 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 216K |
| 代理商： | PSA121.5-9IR |
PSA Series Extended Data Sheet
Positive Switching Regulator (Rugged)
REV. SEP 23, 2003
Page 5 of 13
Thermal Considerations
When a switching regulator is located in free, quasi-sta-
tionary air (convection cooling) at a temperature TA = 71°C
and is operated at its nominal output current Io nom, the
case temperature TC will not exceed 95°C after the warm-
up phase, measured at the Measuring point of case tem-
perature TC (see: Mechanical Data).
Under practical operating conditions, the ambient tem-
perature TA may exceed 71°C, provided additional meas-
ures (heat sink, fan, etc.) are taken to ensure that the case
temperature TC does not exceed its maximum value of
95 °C.
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.
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
no
m
Io L
05033
Fig. 5
Overload, short-circuit behaviour Uo versus Io.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
50
60
70
80
90
100
Io/Io nom
TA [ C]
0.9
1.0
Forced cooling
05031
TA min
TC max
Convection cooling
Parallel and Series Connection
Outputs of equal nominal voltages can be parallel-con-
nected. However, the use of a single unit with higher out-
put 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 heat generation. Con-
sequently, the max. ambient temperature 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. Electrically separated
source voltages are needed for each module!
Short Circuit Behaviour
A constant current limitation circuit holds the output cur-
rent almost constant whenever an overload or a short cir-
cuit is applied to the regulator's output. It acts self-protect-
ing and recovers – in contrary to the fold back method –
automatically after removal of the overload or short circuit
condition.
Fig. 4
Output current derating versus temperature
Output Protection
A voltage suppressor diode which in worst case conditions
fails into a short circuit, protects the output against an in-
ternally generated overvoltage. Such an overvoltage could
occur due to a failure of either the control circuit or the
switching transistor. The output protection is not designed
to withstand externally applied overvoltages. The user
should ensure that systems with Power-One power sup-
plies, in the event of a failure, do not result in an unsafe
condition (fail-safe).
Fig. 3
Dynamic load regulation.
Io/Io nom
1
uod
t d
DUo I
t
Uo
0
t
≥10 s
05010
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