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参数资料
| 型号： | PSC126-7IPD |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 9/13页 |
| 文件大小： | 223K |
| 代理商： | PSC126-7IPD |
PSC Series Extended Data Sheet
Positive Switching Regulators (Rugged)
REV. MAY 12, 2004
Page 5 of 13
Thermal Considerations
When a switching regulator is located in free, quasi-station-
ary air (convection cooling) at a temperature
TA = 71°C and
is operated at its nominal output current
Io nom, the case
temperature
TC will be about 95°C after the warm-up
phase, measured at the
Measuring point of case tempera-
ture 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
Vo/Vo nom
Io/Io nom
I o
no
m
Io L
05033
Fig. 5
Overload, short-circuit behaviour Vo 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 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 heat generation. 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. Electrically separated source
voltages are needed for each module!
Fig. 4
Output current derating versus temperature
Output Protection
A voltage suppressor diode which in worst case conditions
fails into a short circuit (or a thyristor crowbar, option C),
protects the output against an internally generated over-
voltage. Such an overvoltage could occur due to a failure of
either the control circuit or the switching transistor. The out-
put protection is not designed to withstand externally ap-
plied overvoltages. The user should ensure that systems
with Power-One power supplies, in the event of a failure, do
not result in an unsafe condition (fail-safe).
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.
Auxiliary Functions
i Inhibit for Remote On and Off
Note: With open i-input, output is enabled (
Vo = on)
The inhibit input allows the switching regulator output to be
disabled via a control signal. In systems with several units,
this feature can be used, for example, to control the activa-
tion sequence of the regulators by a logic signal (TTL, C-
MOS, etc.). An output voltage overshoot will not occur when
switching on or off.
Fig. 6
Typical inhibit current Iinh versus inhibit voltage Vinh
4
2
0
–50 –40
20
40
–30
0
–20 –10
10
30
50
5
3
1
I
inh [mA]
V
inh [V]
V
o on
V
o off
V
inh
=
0.8
V
inh
=
2.4
V
06034
Vi+
Gi–
Go–
i
Vo+
Iinh
Vinh
06009
Fig. 7
Definition of Iinh and Vinh
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