8905 Datasheet

IC型號：
8905
PDF描述：
3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF S...
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ALLEGRO

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8905

3-PHASE BRUSHLESS DC

MOTOR CONTROLLER/DRIVER

8905

Data Sheet

26301.3

3-PHASE BRUSHLESS DC MOTOR

CONTROLLER/DRIVER WITH BACK-EMF SENSING

The A8905CLB isw a three-phase brushless dc motor controller/

driver for use with CD-ROM or DVD drives. The three half-bridge

outputs are low on-resistance n-channel DMOS devices capable of

driving up to 1.25 A. The A8905CLB provides complete, reliable,

self-contained back-EMF sensing motor startup and running algorithms.

A programmable digital frequency-locked loop speed control circuit

together with the linear current control circuitry provides precise motor

speed regulation.

A serial port allows the user to program various features and modes

of operation, such as the speed control parameters, startup current limit,

sleep mode, diagnostic modes, and others.

LOAD

SUPPLY

C D2

C WD

CST

V BB

COMMUTATION

DELAY

C D1

DATA IN

CLOCK

CHIP SELECT

RESET

SERIAL PORT

OUTA

GROUND

OUT B

OUT C

CENTERTAP

BRAKE

C RES

ABSOLUTE MAXIMUM RATINGS

at T

= +25

擄

Load Supply Voltage, V

. . . . . .

14 V

Output Current, I

OUT

. . . . . . . .

鹵

1.25 A

Logic Supply Voltage, V

. . . .

6.0 V

Logic Input Voltage Range,

. . . . . . .

-0.3 V to V

+ 0.3 V

Package Power Dissipation,

. . . . . . . . . . . . . . . .

See Graph

Operating Temperature Range,

. . . . . . . . . . . . . .

擄

C to +70

擄

Junction Temperature, T

. . .

+150

擄

C鈥?/div>

Storage Temperature Range,

. . . . . . . . . . . .

-55

擄

C to +150

擄

鈥?Fault conditions that produce excessive

junction temperature will activate device thermal

shutdown circuitry. These conditions can be

tolerated, but should be avoided.

Output current rating may be restricted to a value

determined by system concerns and factors.

These include: system duty cycle and timing,

ambient temperature, and use of any heatsinking

and/or forced cooling. For reliable operation, the

specified maximum junction temperature should

not be exceeded.

U Y

D L

O N

R O

P E

D C

E N

U E

IN ER

T F

N E

O R

C R

IS O

D F

鈥?/div>

GROUND

MUX

FLL

DATA OUT

OSCILLATOR

APPLICATIONS

CD-ROMs

DVDs

VDD

LOGIC

SUPPLY

INDEX

BOOST

CHARGE

PUMP

FILTER

FEATURES

Dwg. PP-040-1

DMOS Outputs

Low r

DS(on)

Startup Commutation Circuitry

Back-EMF Commutation Circuitry

Serial Port Interface

Frequency-Locked Loop Speed Control

Tachometer Signal Input

Programmable Start-Up Current

Diagnostics Mode

Sleep Mode

Linear Current Control

Internal Current Sensing

Dynamic Braking Through Serial Port

Power-Down Dynamic Braking

System Diagnostics Data Out

Data Out Ported in Real Time

Internal Thermal Shutdown Circuitry

Always order by complete part number, e.g.,

A8905CLB

標(biāo)準(zhǔn)包裝
100
類別
光電元件
家庭
LED - 墊片，支座
系列
-
顏色
黑
長度
0.220"（5.59mm）
LED
T1，T1 3/4
材質(zhì)
PVC
其它名稱
Q2019129

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