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PSC, PSL Series Data Sheet
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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
V o / V o nom
05033a
Positive Switching Regulators
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 automatically
after removal of the overload or short circuit condition.
Parallel and Series Connection
Outputs of equal nominal voltages can be parallel-connected.
1.0
0.8
0.6
0.4
0.2
I o nom
I o L
However, the use of a single regulator with higher output
power, is always the 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. Consequently, the
max. ambient temperature should be reduced by 10 K.
0
0.2
0.4
0.6
0.8
1.0
1.2 I o / I o nom
Outputs can be series-connected with any other regulator. In
series-connection the maximum output current is limited by
Fig. 6
Overload, short-circuit behaviour V o versus I o .
Auxiliary Functions
the lowest current limitation, but electrically separated source
voltages are needed for each regulator.
I inh [mA]
i Inhibit (Remote On / Off)
5
06034a
4
The inhibit input allows the switching regulator output to be
disabled via a control signal. In systems with several
3
converters, this feature can be used, for example, to control
the activation sequence of the converters by a logic signal
(TTL, C-MOS, etc.). An output voltage overshoot will not
2
1
Output on
Output off
occur, when switching on or off.
Note: With open i-input, the output is enabled.
0
–40
–20
0
20
40
V
V inh
Fig. 7
Typical inhibit current I inh versus inhibit voltage V inh
Table 5: Inhibit characteristics
Characteristics
Conditions
min typ max Unit
06009a
V o = off
V inh Inhibit input voltage V o = on V i min – V i max
T C min – T C max
–50
+2.4
+0.8
+50
V
Vi+
Vo+
i
I inh
t r
t f
Switch-on time
Switch-off time
V i = V i nom
R L = V o nom / I o nom
130
25
ms
Gi–
Go–
V inh
I i inh Input current when inhibited V i = V i nom
25
mA
Fig. 8
Definition of I inh and V inh
BCD20027-G Rev AA, 18-May-2011
Page 10 of 17
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