
PSL Series Extended Data Sheet
Positive Switching Regulators (Benign)
REV. APR 5, 2004
Page 2 of 10
Part Number Description
Type Key
PSL 12 9 -2 R
Positive switching regulator in case L04 .................... PSL
Nominal output voltage in volt (5A for 5.1 V) ......... 5A - 24
Nominal output current in ampere ............................ 9 - 11
Operational ambient temperature range
TA
–10 to 50°C ................................................ -2
Control input for output voltage adjustment .................... R
Example:
PSL 129-2R = A positive switching regulator with a 12 V, 9 A output, ambient temperature range of
–10 to 50°C, with control input for output voltage adjustment.
Product Marking
Series designation, applicable safety approvals and recognition marks, warnings, pin allocation, Power-One patent nos.
and company logo.
Specific type designation, input voltage range, nominal output voltage and current, pin allocation of auxiliary function and
protection degree.
Label with batch no., serial no. and data code comprising production site, modification status of the main PCB and date of
production.
Control circuit
Go–
Vo+
Gi–
Vi+
Input
Filter
R
Io
Vo
Ii
Vi
03019
Ce
29
26
20
23
32
14
17
2
8
11
Fig. 1
Block diagram
Functional Description
The switching regulators are designed using the buck con-
verter
topology.
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. 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.
These regulators are ideal for a wide range of applications,
where input to output isolation is not necessary, or where
already provided by an external front end (e.g. a trans-
former with rectifier). To optimise customer’s needs, addi-
tional options and accessories are available.