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8925: DescriptionBRUSHLESS DC MOTOR CONTROLLER, 4 A, PQCC44; Categoryaccessories; File Size86KB，8 Pages; ManufacturerAllegro; Websitehttp://www.allegromicro.com/

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BRUSHLESS DC MOTOR CONTROLLER, 4 A, PQCC44

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8925

3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER

WITH LINEAR CURRENT CONTROL

AND POWER DMOS OUTPUTS

8925

Data Sheet

26301.30

3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER

WITH LINEAR CURRENT CONTROL

AND POWER DMOS OUTPUTS

LOGIC GROUND

LOGIC SUPPLY

POWER

GROUND

POWER

GROUND

SUB

POWER

GROUND

ABSOLUTE MAXIMUM RATINGS

AT T

= +25

Load Supply Voltage, V

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

14 V

Output Current, I

OUT

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

4.0 A

Logic Supply Voltage, V

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

14 V

Logic Input Voltage Range,

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

-0.3 V to +6.0 V

Package Power Dissipation,

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

See Graph

Operating Temperature Range,

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

C to +70

Junction Temperature, T

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

+150

C†

Storage Temperature Range,

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

-55

C to +150

† 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

—

CHARGE PUMPS

AND CONTROL

SEQUENCING

CIRCUITRY

The A8925CEB is a DMOS three-phase brushless dc motor con-

troller/driver designed for use in Winchester disk drives and other data

storage applications. The power output stages are capable of

±4

output currents and have DMOS power outputs with less than 0.25

Ω

DS(on)

for low power dissipation. Intrinsic ground clamp and flyback

diodes protect the output drivers when switching inductive loads.

Thermal shutdown circuitry is provided to protect the device from ex-

cessive junction temperature.

A transconductance amplifier is used to linearly regulate the load

current and control motor speed. Internal current-sensing circuitry

eliminates the need for external sense resistors. Analog and digital

control circuitry provide complete sequencing of the output drivers as

well as providing brake, disable, and tachometer functions. A FAULT

output flag indicates the presence of an under-voltage condition on the

12 V supply, excessive junction temperature, or an invalid Hall input

combination. The A8925CEB’s commutation logic is compatible with

motors that have digital Hall-effect sensors with 120° of electrical

separation. Internal charge pump circuitry is provided to drive the N-

channel DMOS source drivers to their required gate voltages.

The A8925CEB is provided in a 44-lead PLCC power package for

surface-mount applications. The copper batwing provides for maxi-

mum allowable package power dissipation in the smallest possible

construction.

ENABLE

FAULT

TACH

OUT

POLE

OUTB

OUT

POWER

GROUND

SUB

COMP.

ERROR AMP

REFERENCE

LOAD SUPPLY

VSENSE

BRAKE

Dwg. PP-034

FEATURES

DMOS Outputs

Low r

DS(on)

- 0.25

Ω

Maximum

Linear Current Control

Internal Commutation Circuitry

Internal Current Sensing

Thermal Shutdown Circuitry

Under Voltage Detection Circuitry

Fault Output Flag

Power Surface-Mount Package

Always order by complete part number:

A8925CEB

8925 Related Products

	8925	A8925CEB
Description	BRUSHLESS DC MOTOR CONTROLLER, 4 A, PQCC44	BRUSHLESS DC MOTOR CONTROLLER, 4 A, PQCC44

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