Thick Film Hybrid IC

Ordering number : EN4472A

73096HA (OT)/82793YO 5-2862 No. 4472-1/6

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

5 V Single Output MOS Chopper Regulator

STK730C

Overview

The STK730C is a chopper type step-down dedicated

5 V single output regulator that uses a power MOSFET

as its switching element and a Schottky barrier diode

(SBD) as its flywheel diode.

The STK730C 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 STK730C has been further

improved by the adoption of MOSFET and SBD

technologies, and use of the STK730C 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

STK730C can be used with a single power supply input.

The STK730C 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)

• Efficiency improved (by 10%) by the adoption of

MOSFET and SBD 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 STK730C 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 STK730C’s separate excitation oscillator

structure provides high stability in the switching

frequency.

• The STK730C’s switching operating frequency is set

at 125 kHz, which minimizes beating when used in a

multiple output structure with STK731 and STK733

type products.

Package Dimensions

unit: mm

4141

[STK730C]