STR2A100 SERIES APPLICATION NOTE

Rev. 0.3

Copy Right: SANKEN ELECTRIC CO., LTD.

Page.2

Contents

1. General Descriptions -----------------------------------------------------------------------3

2. Features and Production lineup----------------------------------------------------------3

3. Functional Block Diagram and Terminal List ----------------------------------------4

4. Package Information -----------------------------------------------------------------------5

5. Electrical Characteristics ------------------------------------------------------------------6

6. Typical Application Circuit ---------------------------------------------------------------8

7. Functional Descriptions --------------------------------------------------------------------9

7.1

Startup Operation-------------------------------------------------------------------9

7.2

Constant Output Voltage Control --------------------------------------------- 11

7.3

Soft-Start Function---------------------------------------------------------------- 12

7.4

Automatic Standby Mode Function ------------------------------------------- 12

7.5

Random Switching Function---------------------------------------------------- 13

7.6

Latch Function --------------------------------------------------------------------- 13

7.7

Overcurrent Protection Function (OCP) ------------------------------------- 13

7.8

Overvoltage Protection Function (OVP) ------------------------------------- 14

7.9

Overload Protection Function (OLP) ----------------------------------------- 15

7.10 Thermal Shutdown Protection Function (TSD) ---------------------------- 15

8. Design Notes -------------------------------------------------------------------------------- 16

WARNING

The contents in this document are subject to changes, for improvement and other purposes, without notice.

Make sure that this is the latest version of the document before use.

The operation and circuit examples in this document are provided for reference purposes only. Sanken

assumes no liability for violation of industrial property, intellectual property, or other rights of Sanken or

third parties, that stem from these examples.

The user must take responsibility for considering and determining which objects the products in this

document are used with.

Although Sanken will continue to improve the quality and reliability of its products,

semiconductor products, by their nature, have certain fault and failure rates. The user must take

responsibility for designing and checking to secure the device and system so that a part failure may not lead

to human injury, fire, damages, or other losses.

The products in this document are intended for normal electronic devices (such as home appliances, office

equipment, communication terminals, or measurement devices).

If you are considering using Sanken’s products for a device that requires high reliability (such as transport

machines and their control units, traffic light control systems, disaster prevention, and security equipment

or any kind of safety equipment), make sure that you consult Sanken sales representative. Do not use these

products for devices that require extremely high reliability (such as aerospace instruments, nuclear power

control units, or life support systems) without Sanken’s written consent.

The products in this document are not designed to be radiation-proof.

The contents in this document must not be transcribed or copied without Sanken’s written consent.