PSA Series Extended Data Sheet

Positive Switching Regulator (Rugged)

REV. SEP 23, 2003

Page 2 of 13

Type Key and Product Marking

PSA 12 1.5 -7 i R P Y

Positive switching regulator in case A01 .................... PSA

Nominal output voltage in volt ................................ 12...48

Nominal output current in ampere ........................... 1...1.5

Operational ambient temperature range T

A

–25...71°C ........................................................... -7

–40...71°C (option) .............................................. -9

Inhibit input ........................................................................ i

PCB soldering pins 0.5

∞ 1.0 mm (option) ...................... Y

Example:

PSA 121.5-7iPY = A positive switching regulator with a 12 V, 1.5 A output, ambient temperature range of

–25…71°C, inhibit input, potentiometer and small soldering pins.

Control circuit

Go–

Vo+

Gi–

Vi+

R

i

03016

Option P

Fig. 1

Block diagram

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.

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.