TMC603A DATA SHEET (V. 1.15 / 2009-Nov-19)

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Copyright © 2009 TRINAMIC Motion Control GmbH & Co. KG

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Table of contents

1

FEATURES.......................................................................................................................................... 1

2

TABLE OF CONTENTS ........................................................................................................................ 3

3

SYSTEM ARCHITECTURE USING THE TMC603 ................................................................................... 5

4

PINOUT ............................................................................................................................................. 6

4.1

PACKAGE CODES ............................................................................................................................. 6

4.2

PACKAGE DIMENSIONS QFN52........................................................................................................... 7

5

TMC603 FUNCTIONAL BLOCKS.......................................................................................................... 8

5.1

BLOCK DIAGRAM AND PIN DESCRIPTION................................................................................................ 8

5.2

MOSFET DRIVER STAGE ................................................................................................................ 10

5.2.1

Principle of operation....................................................................................................... 10

5.2.2

Break-before-make logic ................................................................................................... 11

5.2.3

PWM control via microcontroller...................................................................................... 12

5.2.4

Slope control .................................................................................................................... 13

5.2.5

Reverse capacity (QGD) protection.................................................................................... 14

5.2.6

Considerations for QGD protection................................................................................... 15

5.2.7

Effects of the MOSFET bulk diode ..................................................................................... 16

5.2.8

Adding Schottky diodes across the MOSFET bulk diodes ................................................. 16

5.2.9

Short to GND detection .................................................................................................... 17

5.2.10

Error logic......................................................................................................................... 17

5.2.11

Paralleling gate drivers for higher gate current ............................................................... 18

5.3

CURRENT MEASUREMENT AMPLIFIERS.................................................................................................. 19

5.3.1

Current measurement timing............................................................................................ 20

5.3.2

Auto zero cycle ................................................................................................................. 20

5.3.3

Measurement depending on chopper cycle ...................................................................... 21

5.3.4

Compensating for offset voltages .................................................................................... 21

5.3.5

Getting a precise current value using MOSFET on-resistance ........................................... 21

5.4

HALL

FX™ SENSORLESS COMMUTATION ............................................................................................... 22

5.4.1

Adjusting the hallFX™ spike suppression time ................................................................ 23

5.4.2

Adjusting the hallFX™ filter frequency............................................................................. 23

5.4.3

Block commutation chopper scheme for hallFX™............................................................ 24

5.4.4

Start-up sequence for the motor with forced commutation ............................................ 24

5.5

POWER SUPPLY............................................................................................................................. 26

5.5.1

Switching regulator .......................................................................................................... 26

5.5.2

Charge pump.................................................................................................................... 28

5.5.3

Filter capacitors for switching regulator and charge pump............................................. 28

5.5.4

Supply voltage filtering and layout considerations ......................................................... 28

5.5.5

Reverse polarity protection............................................................................................... 29

5.5.6

Standby with zero power consumption ........................................................................... 29

5.5.7

Low voltage operation down to 9V ................................................................................. 29

5.6

TEST OUTPUT................................................................................................................................ 30

5.7

ESD SENSITIVE DEVICE................................................................................................................... 30

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ABSOLUTE MAXIMUM RATINGS ..................................................................................................... 31

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ELECTRICAL CHARACTERISTICS...................................................................................................... 31

7.1

OPERATIONAL RANGE..................................................................................................................... 31

7.2

DC CHARACTERISTICS AND TIMING CHARACTERISTICS ........................................................................... 32

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DESIGNING THE APPLICATION ...................................................................................................... 39

8.1

CHOOSING THE BEST FITTING POWER MOSFET .................................................................................... 39

8.1.1

Calculating the MOSFET power dissipation ...................................................................... 40