VIPER318LDTR datasheet(36/40 Pages) STMICROELECTRONICS

36 / 40 page

Contents

Pin setting.........................................................................2

Electrical and thermal ratings ......................................................4

2.1

Electrical characteristics......................................................... 5

Typical electrical characteristics ...................................................9

General description...............................................................13

4.1

Block diagram ................................................................ 13

4.2

Typical power capability ........................................................ 13

4.3

Primary MOSFET ............................................................. 14

4.4

High-voltage startup ........................................................... 14

4.5

Soft startup................................................................... 15

4.6

Oscillator .................................................................... 16

4.7

Pulse skipping ................................................................ 16

4.8

Direct feedback .............................................................. 17

4.9

Secondary feedback ........................................................... 17

4.10

Pulse frequency modulation..................................................... 17

4.11

Overload protection ........................................................... 18

4.12

Undervoltage protection ........................................................ 18

4.13

Overvoltage protection ......................................................... 21

4.14

Undervoltage and overvoltage protection ......................................... 23

4.15

Thermal shutdown............................................................. 25

Application information ...........................................................26

5.1

Typical schematics ............................................................ 26

5.2

Energy saving performances ................................................... 28

5.3

Layout guidelines and design recommendations ................................... 30

Package information..............................................................32

6.1

[Package name] package information ............................................ 32

Order code .......................................................................34

Revision history .......................................................................35

Contents ..............................................................................36

VIPER31

Contents

DS13285 - Rev 3

page 36/40

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