ST-ONEMP datasheet(35/39 Pages) STMICROELECTRONICS

35 / 39 page

Contents

ST-ONEMP block diagram..........................................................2

Pin connections and description ...................................................3

Electrical ratings ..................................................................5

ESD immunity levels...............................................................6

Thermal data ......................................................................7

Safety data ........................................................................8

Electrical data .....................................................................9

Device operation .................................................................15

8.1

Typical application schematic ................................................... 15

8.2

External component selection ................................................... 16

8.2.1

Symbols used in this section ............................................... 16

8.2.2

Transformer design ...................................................... 16

8.2.3

Clamp capacitor selection ................................................. 17

8.2.4

Secondary side drain sensing .............................................. 17

8.2.5

Secondary side current sense resistor ....................................... 18

8.3

High voltage startup .......................................................... 18

8.4

Soft-start..................................................................... 18

8.5

Switching modes .............................................................. 19

8.5.1

Normal switching mode................................................... 19

8.5.2

Skip mode............................................................. 20

8.5.3

Burst mode ............................................................ 20

8.5.4

Special modes for voltage transitions ........................................ 21

8.5.5

CCM mode ............................................................ 21

8.6

Control loop .................................................................. 21

8.6.1

Voltage sensing......................................................... 21

8.6.2

Peak current mode unit ................................................... 21

8.6.3

Voltage loop ........................................................... 22

8.6.4

Current loop ........................................................... 22

8.6.5

Cable drop compensation ................................................. 23

8.7

Fault management ............................................................ 23

8.7.1

Fault modes ........................................................... 23

8.7.2

Soft-start timeout........................................................ 23

8.7.3

Soft-start overvoltage protection ............................................ 23

8.7.4

Ac brown-out protection .................................................. 24

8.7.5

Primary side overcurrent protection (OCP) .................................... 24

ST-ONEMP

Contents

DS13989 - Rev 2

page 35/39

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