TDA7278 datasheet(3/15 Pages) STMICROELECTRONICS

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PIN FUNCTIONS

Name

Function

WDINP

Watch dog input - AC coupled to WD

µcontroller output

(Disabled when connected to GND)

Watch dog & reset

circuit

CRES

Start up reset control for

µC & watch dog time constant

RESET

Reset output command to

µC (open collector)

BEMP

Battery empty comparator input

Battery control circuit

BLOW

Battery low comparator input

VCON

Battery level control output

VCON = Z VBEMP > VBCON > VBG

VCON = 1 VBEMP > VBG > VBLOW

VCON = 0 VBG > VBEMP > VBLOW

ENABLE

General Enable Input (active Low)

Band Gap Reference

VBG

Reference voltage capacitor

SSCAP

Soft start capacitor

VCPU DC-DC

converter

OUT 1

Switching transistor terminal high

OUT 2

Switching transistor terminal low

VCPU

Regulated voltage

IRC

Error amplifier output

INP

Error amplifier inverting input

VHIGH

Regulated Voltage

Vhigh Boost DC-DC

Converter

OUT

Switching transistor output

STCAP

Sawtooth toth

Oscillator

SYNC

Oscillator synchronizing input

4, 30

VBAT

Power supply voltage

6, 28

GND

Power ground

VREF 2

Buffered reference output voltage

VREF 1

Reference input voltage

FLIN 1

Switching Output

Focus actuator step

down converter

& H bridge

HOUT 1A

H bridge positive output

HIN 1

Regulated voltage H bridge supply

HOUT 1B

H bridge negative output

ERROR 1

Error input

FLIN 3

Switching Output

Tracking actuator

step down converter

& H bridge

HOUT 3A

H bridge positive output

HIN 3

Regulated voltage H bridge supply

HOUT 3B

H bridge negative output

ERROR 3

Error input

FLIN 2

Switching output

Spindle motor step

down converter

& H bridge

HOUT2A

H bridge positive output

HIN 2

Regulated voltage H bridge supply

HOUT 2B

H bridge negative output

ERROR 2

Error input

TDA7278

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