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PSA Datasheet(PDF) 9 Page - Power-One

Part # PSA
Description  Positive Switching Regulators
Download  11 Pages
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Manufacturer  POWER-ONE [Power-One]
Direct Link  http://www.power-one.com
Logo POWER-ONE - Power-One

PSA Datasheet(HTML) 9 Page - Power-One

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REV. SEP 17, 2003
Page 9 of 11
PSA Series Extended Datasheet
Positive Switching Regulator
s (Benign)
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.
R Control for Output Voltage Adjustment
Note: With open R input, Uo
≈ U
o nom.
The output voltage Uo can either be adjusted with an ex-
ternal reference voltage (Uext) or with an external resistor
(Rext). The adjustment range is 0...100% of Uo nom. The
Fig. 11
Voltage adjustment with Uext between R and Go–
Uo
Uext
Uext ≈ 2.5 V • –––––
Uo ≈ Uo nom • –––––
Uo nom
2.5 V
Fig. 12
Voltage adjustment with external resistor Rext
4000
Ω • U
o
Uo nom • Rext
Rext
≈ –––––––––––
Uo
≈ ––––––––––––
Uo nom – Uo
Rext + 4000
Vo+
R
+
4000
G
Uref
Uext
+
Go –
06035
Caution: To prevent damage Uext must neither exceed
2.7 V, nor be negative!
Vo +
R
+
G
4000
Uref
Rext
Go –
06040
minimum differential voltage
DUio min between input and
output (see: Electrical Input Data) should be maintained.
Undervoltage look-out = minimum input voltage.
Table 9: Inhibit characteristics
Characteristics
Conditions
min
typ
max
Unit
Uinh
Inhibit input voltage to keep
Uo = on
Ui min...Ui max
–10
+0.8
V DC
regulator output voltage...
Uo = off
TC min...TC max
+2.4
+50
t r
Switch-on time after inhibit command
Ui = Ui nom
2ms
t f
Switch-off time after inhibit command
RL = Uo nom /Io nom
4
Ii inh
Input current when inhibited
Ui = Ui nom
10
mA
0
t
t
0
Inhibit
1
0.1
1
Uo/Uo nom
tr
tf
06001
Fig. 10
Output response as a function of inhibit signal
i Inhibit for Remote On and Off
Note: With open i-input, output is enabled (Uo = on)
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.
Vi+
Gi–
Go–
i
Vo+
Iinh
Uinh
06009
Fig. 9
Definition of Iinh and Uinh
Fig. 8
Typical inhibit current Iinh versus inhibit voltage Uinh
4
2
0
-50 -40
20
40
-30
0
-20 -10
10
30
50
5
3
1
Iinh [mA]
Uinh [V]
Uo on
Uo off
06010


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