PSA123-2 POWER-ONE [Power-One], PSA123-2 Datasheet - Page 9

• Manufacturer Part Number: PSA123-2
• Description: Positive Switching Regulators
• Manufacturer: POWER-ONE [Power-One]

I
Description of Options
With this series, the options i (inhibit), R (control input for output voltage adjustment) and Y (small soldering pins) are
defined as a package. Other combinations or parts of this package are not available.
Table 9: Inhibit characteristics
Fig. 11
Voltage adjustment with U
Fig. 8
Typical inhibit current I
R Control for Output Voltage Adjustment
Note: With open R input, U
The output voltage U
ternal reference voltage (U
(R
i Inhibit for Remote On and Off
Note: With open i-input, output is enabled (U
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.
REV. SEP 17, 2003
inh
5
4
3
2
1
0
Characteristics
U
t
t
I
Caution: To prevent damage U
2.7 V, nor be negative!
i inh
-50 -40
r
f
ext
inh
U
[mA]
ext
). The adjustment range is 0...100% of U
+
2.5 V • –––––
U
-30
U
Inhibit input voltage to keep
regulator output voltage...
Switch-on time after inhibit command
Switch-off time after inhibit command
Input current when inhibited
ext
R
G
o
on
-20 -10
Go –
U
o nom
U
U
4000
o
o
ref
inh
can either be adjusted with an ex-
0
versus inhibit voltage U
ext
ext
o
Vo+
10
) or with an external resistor
between R and Go–
U
U
+
–
o
o nom
ext
20
must neither exceed
U
U
06035
.
o nom
o
30
U
U
off
o
o
= on
= off
40
• –––––
2.5 V
06010
o
U
= on)
50
ext
o nom
inh
U
. The
inh
Page 9 of 11
[V]
Conditions
U
T
U
R
U
Positive Switching Regulator
C min
i min
i
L
i
= U
= U
= U
Fig. 9
Definition of I
Fig. 10
Output response as a function of inhibit signal
minimum differential voltage DU
output (see: Electrical Input Data) should be maintained.
Undervoltage look-out = minimum input voltage.
Fig. 12
Voltage adjustment with external resistor R
...U
...T
i nom
i nom
o nom
R
U
i max
0.1
C max
ext
o
Inhibit
1
0
1
0
/U
/I
o nom
Vi+
Gi–
o nom
R
–––––––––––
PSA Series Extended Datasheet
ext
4000
U
o nom
inh
R
G
and U
t
– U
r
Go –
• U
o
o
+2.4
min
inh
–10
U
4000
ref
Go–
Vo+
U
typ
10
2
4
o
i
Vo +
io min
––––––––––––
+
–
R
U
ext
I
max
+0.8
+50
inh
o nom
between input and
U
+ 4000
06040
s (Benign)
inh
t
f
• R
ext
ext
06001
V DC
06009
Unit
mA
ms
t
t