Thick Film Hybrid IC

Ordering number : EN4533B

61096HA (OT)/82793YO (OT)No. 4533-1/6

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

15 V Single Output MOS Chopper Regulator

STK732C

Overview

The STK732C is a chopper type step-down dedicated

15 V single output regulator that uses a power MOSFET

as its switching element. The STK732C covers the 2 A

and higher current regions, regions that are difficult to

handle with three terminal step-down regulators. As

compared with earlier chopper regulator products that

used bipolar transistors, the efficiency of the STK732C

has been further improved by the adoption of MOSFET

technology, and use of the STK732C enables further

miniaturization and increased performance in the end

product since it corresponds to the adoption of a

dedicated switching controller IC. Furthermore, due to

the development of a unique MOS drive circuit, the

STK732C can be used with a single power supply input.

The STK732C can prove useful when standardizing and

rationalizing power supply circuit design, since it can

handle a wide range of power supply circuits in a

number of applications, either as the secondary side

regulator in a switching power supply or as the output

regulator following AC transformer rectification.

Applications

• Power supplies in printers and other office equipment

• Power supplies in robots and other factory automation

related equipment

• Power supplies in VCRs and other consumer products

• Secondary side regulators in switching power supplies

Features

• IMST substrate (insulated metal substrate technology)

• High efficiency realized by the adoption of MOSFET

technology.

• An auxiliary drive power supply is no longer required

due to the development of a unique NMOS FET drive

circuit. This means that the STK732C can be used

with a single power supply, thus allowing

simplification of the input system.

• Built-in reverse going linear overload characteristic

curve overcurrent protection circuit

• Ground line handling is eased even in multi-output

power supply structures due to placement of the

overcurrent detection resistor on the plus line.

• The STK732C’s separate excitation oscillator

structure provides high stability in the switching

frequency.

• A built-in cutoff function allows an external signal to

switch the output on and off.

• The STK732C’s switching operating frequency is set

at 85 kHz, which minimizes beating when used in a

multiple output structure with STK730 type (5 V

output, 125 kHz) products.

Package Dimensions

unit: mm

4137

[STK732C]