STK730C Datasheet, PDF (1/6 Pages) Sanyo Semicon Device – 5 V Single Output MOS Chopper Regulator

Ordering number : EN4472A
Thick Film Hybrid IC
STK730C
5 V Single Output MOS Chopper Regulator
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]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
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