PSK, PSS Series Data Sheet
?
Table 4e: Output data of PSK models. General conditions as per table 3a
Positive Switching Regulators
Output
PSK3612
PSK4812
Unit
Characteristics
V o
Output voltage
Conditions
V i nom , I o nom
min
35.78
typ
max
36.22
min
47.71
typ
max
48.29V
I o
I oL
Output current
Output current limit
V i min – V i max
T C min – T C max
0
12
12
15
0
12
12
15
A
v o
Output
voltage
noise
Switching freq.
Total incl. spikes
V i nom , I o nom
IEC/EN 61204
BW = 20 MHz
35
39
60
64
35
39
60
64
mV pp
? V o V
? V o l
v o d
t d
α Vo
Static line regulation
Static load regulation
Dynamic
Voltage deviat.
load
Recovery time
regulation
Temperature coefficient
? V o / ? T C ( T C min to T C max )
V i min – V i max , I o nom
V i nom , I o = 0 – I o nom
V i nom
I o nom ? 1 / 3 I o nom
IEC/EN 61204
V i min – V i max
I o = 0 – I o nom
120
60
200
70
250
120
±5
±0.02
150
70
200
70
350
150
±10
±0.02
mV
μs
mV/K
%/K
Output Voltage Regulation
The dynamic load regulation is shown in fig. 2
V o
V o / V o nom
1.0
05038a
V od
V o ±1 %
V o ±1 %
0.8
0.6
I o L
I o / I o nom
t d
V od
t d
t
0.4
0.2
0
0.2
0.4
0.6
0.8
1.0
1.2 I o / I o nom
1
Fig. 4
0.5
≥ 10 μs
≥ 10 μs
Overload, short-circuit behaviour V o versus I o .
0
Fig. 3
Dynamic load regulation.
05102c
t
Parallel and Series Connection
Outputs of equal nominal voltage may be parallel-connected.
Interconnect the current sharing pins T (pin 22) for even
distribution of the output current; see Auxiliary Functions .
Output Protection
A voltage suppressor diode, which in worst case conditions
fails into a short-circuit, protects the output against an
internally 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.
Current Limitation
A constant current limitation circuit holds the output current I o
almost constant in the area of 100 to 120% of I o nom , when an
overload or a short-circuit is applied to the output. It acts self-
protecting and recovers – in contrary to the fold back method –
automatically after removal of the overload or short-circuit
condition.
Outputs can be series-connected with any other regulator,
provided that the regulators are powered by electrically
isolated source voltages. In series connection the maximum
output current is limited by the lowest current limitation.
BCD20029-G Rev AB, 12-Aug-2013
MELCHER
The Power Partners.
Page 9 of 20
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