– 0.4-A MOS H-Bridge Power Amplifier

– No Crossover Distortion

– Precision VCM Control Loop With External Sense

Resistor

– Internal 8-Bit Control DAC With Four Gain Ranges

– Controlled-Velocity Head Retract

– Compensation Adjust Terminals for Bandwidth

Control

– Capability for External Velocity Feedback

– No External Retract Power Supply Isolation

Components Required

– Hall- or Back-EMF Commutation Circuitry

– 3-Phase Driver With 1.3-A MOS Output

– Bipolar or Unipolar Drive Modes

– Programmable Frequency-Locked Speed

Control Loop

– Programmable Start-Up Current

– Linear Spindle Current Control

– Sector Data Tachometer Signal Input

(Optional)

– Speed Sense Tachometer Output

– Internal Schottky Diodes for Retract Power

Source

– Controlled Brake Function

SLFS040

– DECEMBER 1993

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

Copyright

1993, Texas Instruments Incorporated

1

Single-Chip Voice-Coil Motor Driver and

Spindle-Motor Driver

Precision Dual-Voltage Monitor

Operates From Single 5-V Supply

LinBiCMOS

Technology

Low Power Dissipation

Internal Overtemperature Shutdown

Circuitry

Low-Profile 56-Terminal DL Package and

64-Terminal PM Package Available

4-V Reference Buffer

System Power-On Reset

Monotonic 8-Bit DAC

description

The TLS2205 is a combination voice-coil and

spindle-motor

driver

with

voltage

monitor

integrated circuit. This circuit is designed for

small-form-factor, high-performance hard disk

drives. The TLS2205 integrates a three-phase

brushless dc motor driver with a linear full-bridge

voice-coil driver. Additional circuitry is added for

power-up and power-down sequencing of the

driver amplifiers used for motor speed control. A

brake function can be invoked on the spindle

motor after the head is in a safe landing zone.

External sense resistors are used for precision

spindle motor and VCM current monitoring.

Automatic head retract is provided for voltage or

thermal fault conditions. The TLS2205 operates

with only 5 V of supply voltage and has a

sleep-mode option for low-power applications. All

device functions are controlled from a three-wire serial port. Device packaging is a 56-terminal DL or 64-terminal

PM package. Center pins are tied to the die mount tab for improved heat dissipation on both packages.

Voice-Coil Motor Driver

Spindle-Motor Driver

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

SCLK

SDATA

SPSZ

PORN

UV

CPOR

NC

NC

VCMGND

VCMA

SPNGND

SPNGND

SPNGND

SPNGND

VCMB

AGND

RETOUT

RETSET

NC

RSENP

RSENN

CMPI

CMPO

VIVCM

VCMREF

MTRCLK

AUXIN

AUXOUT

NC

HU

HV

HW

DGND

U

SPNSNSR2

SPNGND

SPNGND

SPNGND

SPNGND

SPNSNSR1

V

W

CRET

REFBUF

SPNCOMP

CTS

VPHASE

COMDLY2

COMDLY1

SPNSW

CTDRV

DL PACKAGE

(TOP VIEW)

SUBSTRATE

GROUND

AND

HEAT SINK

NC

– No internal connection

LinBiCMOS is a trademark of Texas Instruments Incorporated.