psb243-7ir Power-One, psb243-7ir Datasheet - Page 6

• Manufacturer Part Number: psb243-7ir
• Description: Psb Series Extended Positive Switching Regulators Rugged
• Manufacturer: Power-One

REV. OCT 17, 2003
Fig. 5
Typical temperature dependent output current limitation
response I
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. 6
Overload, short-circuit behaviour V
or I
I
I
1.2
1.0
0.8
0.6
0.4
0.2
V
o max
o nom
o
0
/ V
V
o
I
i min
o nom
o
- I
o nom
0.2
1 A
o L
.
.
0.4
80
0.6
108
0.8
1.0
o
versus I
T
I
T
T
o L
A
A
A
144
= 46˚C, T
1.2
= 60˚C, T
= 71˚C, T
o
05026
V
at V
1.4
i
[V]
C
C
C
i
= 83˚C
= 90˚C
= 95˚C
I
- 80 V
o
/ I
Page 6 of 13
o max
05028
Positive Switching Regulators (Rugged)
Auxiliary Functions
i Inhibit for Remote On and Off
Note: With open i-input, output is enabled ( V
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
activation 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. 7
Typical inhibit current I
Fig. 8
Definition of I
Fig. 9
Output response as a function of inhibit signal
I
inh
V
5
4
3
2
1
0
0.1
–50 –40
o
Inhibit
[mA]
1
1
0
0
/ V
o nom
PSB Series Extended Data Sheet
Vi+
Gi–
–30
V
inh
o
on
t
–20 –10
r
and V
inh
inh
versus inhibit voltage V
0
Go–
Vo+
10
i
20
V
o
I
30
inh
off
t
f
V
inh
40
06034
o
= on)
50
06001
inh
t
t
06009
V
inh
[V]