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参数资料
| 型号： | PSB123-7IR |
| 厂商： | Power-One |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | SWITCHING REGULATOR 36W 12V |
| 标准包装： | 1 |
| 系列： | * |
PSB Series Data Sheet
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Under practical operating conditions, the T A may exceed
71 °C, provided that additional measures (heat sink, fan, etc.)
V o / V o nom
Positive Switching Regulators
05026a
are taken to ensure that the case temperature T C does not
exceed T C max .
The regulators with V i max = 144 V withstand 156 V for 2 s in
order to comply with railway standards. However, I o max is only
continuously available for V i ≤ 80 V or for reduced T A and T C ;
see fig. 4c.
1.0
0.8
0.6
0.4
0.2
I o max
I o L
For operation of regulators with V i max = 144 V at T A ≥ 46 °C, an
internal PTC (thermistor) starts reducing I o L , if V i is greater
0
0.2
0.4
0.6
0.8
1.0
1.2 I o / I o max
than 80 V. At most unfavorable conditions, I o L is reduced by
1 A; see fig. 5.
Fig. 6b
I o
I o max
I o nom
1 A
05028a
T A = 46 °C, T C = 83 °C
T A = 60 °C, T C = 90 °C
T A = 71 °C, T C = 95 °C
Short-circuit behaviour V o versus I o for regulators with
V i max = 144 V.
Parallel and Series Connection
Outputs of equal nominal voltages can be parallel-connected.
However, the use of a single regulator with higher output power,
is always the better solution.
V i min
80
108
144 V
V i
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. Consequently, the
Fig. 5
Typ. dependance of I o L of temperature
Output Protection and Short Circuit Behaviour
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 output
protection is not designed to withstand externally applied
overvoltages.
A constant current limitation circuit holds the output current
almost constant, when an overload or a short circuit is applied
to the output. It acts self-protecting and recovers auto-
matically after removal of the overload or short circuit
condition.
V o / V o nom
05033a
max. ambient temperature should be reduced by 10 K.
Outputs can be series-connected with any other regulator. In
series-connection the maximum output current is limited by the
lowest current limitation, but electrically separated source
voltages are needed for each regulator.
1.0
0.8
0.6
0.4
0.2
I o nom
I o L
0
0.2
0.4
0.6
0.8
1.0
1.2 I o / I o nom
Fig. 6a
Short-circuit behaviour V o vs. I o for regulators with V i max ≤ 80 V
BCD20026-G Rev AA, 18-May-2011
Page 9 of 15
www.power-one.com
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