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

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

Type Key
Positive switching regulator in case A01 .................... PSA
Nominal output voltage in volt (5 A for 5.1 V) ......... 5A...24
Nominal output current in ampere .............................. 2...5
Operational ambient temperature range T
Options package:
Example:
Functional Description
The switching regulators are using the buck converter to-
pology. See also: Technical Information: Topologies. The
input is not electrically isolated from the output. During the
on period of the switching transistor, current is transferred
to the output and energy is stored in the output choke in
the form of flux. During the off period, this energy forces
the current to continue flowing through the output, to the
load and back through the freewheeling diode. Regulation
is accomplished by varying the on to off duty ratio of the
power switch.
Fig. 1
Block diagram
REV. SEP 17, 2003
U
i
I
–10...50°C ........................................................... -2
Inhibit input ............................................................ i
Control input for output voltage adjustment ........ R
PCB soldering pins 0.5 x 1.0 mm ......................... Y
i
C
e
–10…50°C, with options package: inhibit input, external output voltage adjustment and small soldering pins.
PSA 123-2iPY = A positive switching regulator with a 12 V, 3 A output, ambient temperature range of
Gi–
Vi+
A
Page 2 of 11
Positive Switching Regulator
These regulators are ideal for a wide range of applica-
tions, where input to output isolation is not necessary, or
where already provided by an external front end (e.g. a
transformer with rectifier). To optimise customer’s needs,
additional options and accessories are available.
Control circuit
PSA Series Extended Datasheet
03050
Vo+
i (option
package)
R (option
package)
Go–
s (Benign)
PSA 12 3 -2 iRY
I
o
U
o