L6717TR datasheet(3/56 Pages) STMICROELECTRONICS

No. de pieza	L6717TR

Descripción Electrónicos	High-efficiency hybrid AM2r2 controller with I2C interface and embedded drivers

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

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3 / 56 page

L6717

Contents

Doc ID 17326 Rev 1

3/56

7

Output voltage positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7.1

CORE section - phase # programming . . . . . . . . . . . . . . . . . . . . . . . . . . 35

7.2

CORE section - current reading and current sharing loop . . . . . . . . . . . . 35

7.3

CORE section - defining load-line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

7.4

CORE section - analog offset (Optional - I2CDIS = 3.3 V) . . . . . . . . . . . . 37

7.5

NB section - current reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

7.6

NB section - defining load-line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

7.7

On-the-fly VID transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.8

Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

7.8.1

LS-Less Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

8

Output voltage monitoring and protections . . . . . . . . . . . . . . . . . . . . . 41

8.1

Programmable overvoltage (I2DIS = 3.3 V) . . . . . . . . . . . . . . . . . . . . . . . 41

8.2

Feedback disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8.3

PWRGOOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

8.4

Overcurrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

8.4.1

CORE section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

8.4.2

NB section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9

Main oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

10

High current embedded drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

10.1

Boot capacitor design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

10.2

Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

11

System control loop compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

11.1

Compensation network guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

12

LTB Technology® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

13

Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

13.1

Power components and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

13.2

Small signal components and connections . . . . . . . . . . . . . . . . . . . . . . . 53

14

VFQFPN48 mechanical data and package dimensions . . . . . . . . . . . . 54

15

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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