A8932CLWA Просмотр технического описания (PDF) - Allegro MicroSystems

Номер в каталоге

Компоненты Описание

Список матч

A8932CLWA

VOICE-COIL MOTOR DRIVER

Allegro MicroSystems 

8932-A

VOICE-COIL MOTOR DRIVER

TERMINAL FUNCTIONS

Term.

1

2

3

4

5

Terminal Name

RET REF

VFLT

VBEMF

GROUND

UVSET

6

ROUT P

7

OUT

8

SWITCH

9

INN

10

OUTSW

11

RETRACT

12

FAULT

13

MPRESET

14

SIGNAL SUPPLY

15

ACT

16

REFERENCE

17

H GAIN

18

PWR OFF

19

ACTFB

20

SGNDP

21

OUTN

22

LOAD SUPPLY

23

OUTP

24

SGNDN

25

VSENS FB

26

VLOAD

27

VSENS

28

RET SET

Function

The reference supply for setting the voltage across the load during retract.

Reservoir (energy storage) capacitor used to operate fault circuitry.

Back-EMF voltage from spindle motor used to retract heads during loss of power.

Circuit reference.

Under-voltage trip point reference input. Set internally to 4.2 V but may be overridden by

external resistor divider. (Equation 4).

Source driver used for retract; externally connected to OUTP.

Output of uncommitted operational amplifier.

Logic input for transmission gate; a high level connects OUT to OUTSW.

Inverting input to uncommitted operational amplifier.

Transmission-gated output of uncommitted operational amplifier.

An active-low logic input that initiates the retract sequence.

A logic low at this MOS output indicates a thermal shutdown, under-voltage fault, or retract

command.

(Power-On Reset) A logic low at this open-collector output may be used to reset the

system on under-voltage fault or power on.

VCC; low-current supply voltage in the range of 4.5 V to 5.5 V.

Input which controls the current in the load. Transconductance gain is set with an external

resistor in series with this input (Equation 1).

VREF; reference input for all amplifiers; ac ground.

Logic input to switch the error amplifier transconductance gain: LOW = 2000,

HIGH = 8000.

An active-high logic input that puts the device in a “sleep mode”.

All fault circuitry remains active.

Input connection for feedback network which sets the error amplifier gain and bandwidth.

Power ground for the OUTP sink driver.

Power output. Sinks current when VACT < VREF.

VDD; high-current supply voltage for the voice-coil motor.

Power output. Sinks current when VACT > VREF.

Power ground for the OUTN sink driver.

Input connection for feedback network which sets the current-sense amplifier gain and

bandwidth. Also called gm SET.

An output voltage proportional to the load voltage. Used in conjunction with closed-loop

velocity control.

Voltage output representing load current (Equation 2). Also called MONITOR.

An external resistor divider to set the retract voltage across the load. Used in conjunction

with VRET-REF (Equation 3).

www.allegromicro.com

Share Link: