8936 Просмотр технического описания (PDF) - Allegro MicroSystems

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8936

VOICE COIL MOTOR DRIVER

Allegro MicroSystems 

8936

VOICE COIL MOTOR DRIVER

TEST CIRCUIT AND TYPICAL APPLICATION

RZ

Rgm

CZ

VIN

VREF = 2 V

H GAIN

PWR OFF

FRAULT ≥ 200 kΩ

ERROR

– AMP

+

V CC

I SENSE +

+5 V

V DD

V REF

––

POWER

AMP

+

2V –

C1 R1

VOICE COIL

MOTOR

POWER

CONTROL

LOGIC

TSD

I SENSE –

CURRENT-SENSE

AMP

–

VREF +

RS

V SENS

PROTECTION

CIRCUITRY

RETRACT

CONTROL

QS

WINDOW

COMP.

V REF

QR

R

5

VCC

R7

R6

R8

BACK EMF FROM

SPINDLE MOTOR

VDD

DIODE FOR RETRACT FUNCTION

OTHERWISE SHORT TO SUPPLY

Dwg. EP-043A

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