stk732 Sanyo Semiconductor Corporation, stk732 Datasheet

stk732

Manufacturer Part Number

stk732

Description

Single Output Chopper Regulator

Manufacturer

Sanyo Semiconductor Corporation

Datasheet

1.STK732.pdf (6 pages)

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Ordering number : EN4533B

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

• Power supplies in VCRs and other consumer products

• Secondary side regulators in switching power supplies

related equipment

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

Features

• IMST substrate (insulated metal substrate technology)

• High efficiency realized by the adoption of MOSFET

• An auxiliary drive power supply is no longer required

• Built-in reverse going linear overload characteristic

• Ground line handling is eased even in multi-output

• The STK732C’s separate excitation oscillator

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

• The STK732C’s switching operating frequency is set

Package Dimensions

unit: mm

4137

technology.

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.

curve overcurrent protection circuit

power supply structures due to placement of the

overcurrent detection resistor on the plus line.

structure provides high stability in the switching

frequency.

switch the output on and off.

at 85 kHz, which minimizes beating when used in a

multiple output structure with STK730 type (5 V

output, 125 kHz) products.

[STK732C]

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

Thick Film Hybrid IC

STK732C

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stk732 Summary of contents

Page 1

... 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 ...

Page 2

... Output voltage setting Ripple voltage Input regulation Reg-IN Load regulation Reg-L Overcurrent protection start current I Efficiency Operating frequency Output voltage temperature coefficient T Cutoff voltage (Pin 12 input voltage) Peak Current Block Diagram STK732C Condition max j-c T stg Condition V V (DC Vrp V ...

Page 3

... GND lines. If this is a problem either make the heat sink floating or use an insulating sheet – Input voltage – Substrate temperature, Tc – °C STK732C 220 µF/ 200 µH (HP-054/TOKIN) 0.05 Ω 1000 µF/25 V Rs1 10 Ω 0.1 µF/ µF/50 V ...

Page 4

... The figure below left shows the relationship between area and thermal resistance when an aluminum plate is used in the thermal design. The radiation characteristics of an aluminum plate can be improved by painting the surface in black. This can reduce the thermal resistance by 20% for a given surface area. c-a – S Heat sink area, S – cm j-c and Tj max for the STK732C Parameter j-c Tj max PTR (FET) 3.5° ...

Page 5

... Locations where multiple pins are used (pins 7 and 8, and pins 9 and 10) must be connected in the printed circuit pattern. Output On/Off Control (cutoff) The on/off control function uses pin 12. When pin the low level, the output will be cut off. STK732C Connection diagram for circuits that do not use the cutoff function. No. 4533-5/6 ...

Page 6

... SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of November, 1997. Specifications and information herein are subject to change without notice. STK732C No. 4533-6/6 ...

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