L6983IQTR datasheet(51/56 Pages) STMICROELECTRONICS

51 / 56 page

Contents

Pin configuration ..................................................................2

Typical application circuit..........................................................4

Maximum ratings ..................................................................5

3.1

Absolute maximum ratings....................................................... 5

3.2

ESD protection ................................................................ 5

3.3

Thermal characteristics ......................................................... 5

Electrical characteristics...........................................................6

4.1

Frequency selection table ....................................................... 8

Functional description .............................................................9

5.1

Primary side ................................................................... 9

5.1.1

Enable................................................................ 10

5.1.2

Soft-start .............................................................. 11

5.1.3

Undervoltage lockout .................................................... 12

5.1.4

Minimum on-time ....................................................... 13

5.1.5

Switch-over feature ...................................................... 14

5.1.6

Spread spectrum........................................................ 14

5.2

Transformer .................................................................. 15

5.3

Secondary side ............................................................... 15

5.4

Iso-buck operation principle ..................................................... 16

Iso-buck performances ...........................................................17

6.1

Output voltage line regulation ................................................... 17

6.2

Output voltage load regulation................................................... 19

6.3

Efficiency .................................................................... 20

Device protections................................................................23

7.1

Overvoltage protection ......................................................... 23

7.2

Overcurrent protection ......................................................... 23

7.3

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

7.4

Power good .................................................................. 25

Closing the loop ..................................................................27

8.1

GCO(s)control to output transfer function .......................................... 27

8.2

Error amplifier compensation network ............................................ 28

8.3

Voltage divider ................................................................ 29

Application notes .................................................................31

9.1

Output voltage adjustment ...................................................... 31

L6983I

Contents

DS14040 - Rev 1

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