AN3994 datasheet(2/53 Pages) STMICROELECTRONICS

2 / 53 page

Contents

AN3994

2/53

Doc ID 022380 Rev 1

Contents

ST multidrain technology evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Parasitic capacitances overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

MOSFET standard turn-on and turn-off analysis . . . . . . . . . . . . . . . . . 11

Gate charge curve impact on dynamic responses . . . . . . . . . . . . . . . 15

Latest ST MD II and MD V technology at a glance . . . . . . . . . . . . . . . . 20

MD II and MD V: which is the lowest loss one? . . . . . . . . . . . . . . . . . . 21

6.1

STB42N65M5 vs. STW48NM60N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.2

STP35N65M5 vs. STB36NM60N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.3

STP21N65M5 vs. STP24NM60N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.4

STP16N65M5 vs. STP18NM60N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.5

Comments about energy ON comparison . . . . . . . . . . . . . . . . . . . . . . . . 33

6.6

Comments about energy OFF comparison . . . . . . . . . . . . . . . . . . . . . . . 33

MOSFET critical parameters in high switching environments . . . . . . 36

7.1

Parasitic inductance influence on switching losses . . . . . . . . . . . . . . . . . 36

7.2

Common source inductance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

7.3

Minimizing common source inductance: layout optimization and Kelvin

source connection on STW77N65M5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.4

Minimizing common source inductance impact at turn-off: negative

VGMoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

7.5

Switching loop inductance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

AN3994 데이터시트(PDF) 2 Page - STMicroelectronics