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TDA7278

HIGH-EFFICIENCY CD ACTUATOR DRIVER

WIDE OPERATIVE SUPPLY RANGE (1.6 to

5V) LOW VOLTAGE OPERATION CAPABIL-

ITY

4 LOAD DRIVING VOLTAGES PWM REGU-

LATED (STEP DOWN FROM BATTERY)

LOW ON RESISTANCE H BRIDGES

(2 x 1.6鈩?MAX + 2 x 2.5鈩?MAX) FOR:

鈥?FOCUS AND TRACKING ACTUATORS

鈥?SLEDGE AND SPINDLE MOTORS

SYNCHRONIZABLE SAWTOOTH OSCILLATOR

CONFIGURABLE DC/DC CONVERTER FOR

ADJUSTABLE MAIN POWER SUPPLY, WITH

LOW ON RESISTANCE (0.4鈩?MAX) SWITCH

GENERAL ENABLE INPUT

ADJUSTABLE WATCH DOG AND DELAYED

POWER ON RESET FUNCTIONS

PQFP44

ADJUSTABLE COMPARATORS FOR BAT-

TERY LOW AND BATTERY EMPTY DETEC-

TION

PIN CONNECTION

H OUT 2B

H OUT 4B

34

33

32

31

30

29

28

27

26

25

24

23

12

SSCAP

13

INP

14

IRC

15

VCPU

16

OUT1

17

OUT2

18

VBG

19

RESET

20

CRES

21

WDINP

22

STCAP

H IN 4

H OUT 4A

FLIN 4

VBAT

FLIN 3

GND

H OUT 3A

H IN 3

H OUT 3B

ENABLE

SYNC

ERROR 1

ERROR 2

ERROR 4

36

ERROR 3

35

VREF(2)

38

VREF(1)

37

BLOW

40

VCON

39

44

H IN 2

H OUT 2A

FLIN 2

VBAT

FLIN 1

GND

H OUT 1A

H IN 1

H OUT 1B

OUT

VHIGH

1

2

3

4

5

6

7

8

9

10

11

43

42

41

BEMP

D94AU112A

March 1997

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