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AN1762 APPLICATION NOTE

Table of Contents

1

INTRODUCTION ................................................................................................................................1

2

MAIN DIFFERENCES BETWEEN L6205, L6206, L6207 ..................................................................4

3

DESIGNING AN APPLICATION WITH L6205, L6206, L6207 ...........................................................4

3.1

Current Ratings ........................................................................................................................4

3.2

Voltage Ratings and Operating Range ....................................................................................4

3.3

Choosing the Bulk Capacitor....................................................................................................6

3.4

Layout Considerations .............................................................................................................7

3.5

Sensing Resistors ....................................................................................................................9

3.6

Charge pump external components .......................................................................................10

3.7

Sharing the Charge Pump Circuitry .......................................................................................11

3.8

Reference Voltage for PWM Current Control (L6207 ONLY).................................................12

3.9

Input Logic pins ......................................................................................................................13

3.10

EN pins...................................................................................................................................13

3.11

Programmable off-time Monostable (L6207 ONLY)..............................................................14

3.11.1 Off-time Selection and minimum on-time (L6207 ONLY) ................................................16

3.11.2 Slow Decay Mode (L6207 ONLY) ...................................................................................17

3.12

Over Current Protection ........................................................................................................18

3.13

Adjusting the Over Current Detection trip point (L6206 ONLY) ............................................21

3.14

Paralleling two Full Bridges...................................................................................................23

3.14.1 Paralleling two Full Bridges to get a single Full Bridge ....................................................23

3.14.2 Paralleling the four Half Bridges to get a single Half Bridge.............................................26

3.15

Power Management ..............................................................................................................27

3.15.1 Maximum output current vs. selectable devices..............................................................27

3.15.2 Power Dissipation Formulae for different sequences ......................................................28

4

APPLICATION EXAMPLE (L6207) ..................................................................................................32

4.1

Decay mode, sensing resistors and reference voltage. .........................................................32

5

APPENDIX - EVALUATION BOARDS .............................................................................................33

5.1

PractiSPIN..............................................................................................................................33

5.2

EVAL6205N ...........................................................................................................................34

5.2.1 Important Notes ................................................................................................................35

5.3

EVAL6206N ...........................................................................................................................39

5.3.1 Important Notes ................................................................................................................40

5.4

EVAL6206PD .........................................................................................................................44

5.4.1 Important Notes ................................................................................................................45

5.5

EVAL6207N ...........................................................................................................................49

5.5.1 Important Notes ................................................................................................................50

6

REFERENCES.................................................................................................................................53