A8904SLB-T 查看數據表（PDF） - Allegro MicroSystems

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A8904SLB-T

3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING

Allegro MicroSystems 

8904

3-PHASE BRUSHLESS DC MOTOR

CONTROLLER/DRIVER WITH BACK-EMF SENSING

A8904SLB (SOIC)

Absolute Maximum Ratings

The A8904SLB and A8904SLP are three-phase brushless dc motor

controller/drivers designed for applications where accurate control of high-

speed motors is required. The three half-bridge outputs are low on-resistance

n-channel DMOS devices capable of driving up to 1.2 A. The A8904 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, direction, and diagnostic modes.

The A8904 is fabricated in Allegro’s BCD (Bipolar CMOS DMOS)

process, an advanced mixed-signal technology that combines bipolar, analog

and digital CMOS, and DMOS power devices. The A8904SLB is provided in

a 24-lead wide-body SOIC batwing package. The A8904SLP is provided in a

thin (<1.2 mm), 28-lead TSSOP package with an exposed thermal pad. Each

package type is available in a lead-free version (100% matte tin leadframe).

Load Supply Voltage, VBB . . . . . . . . . . . . 15 V

Output Current1, IOUT . . . . . . . . . . . . . . . . . . . . . ±1.4 A

Peak Output Current (Brake)2, IOUT(BRK) . ±3.0 A

Period2 for IOUT(BRK) to fall from

±3.0 A to ±1.4 A . . . . . . . . . . . . . . . 800 ms

Logic Supply Voltage, VDD . . . . . . . . . . . 7.0 V

Logic Input Voltage Range, VIN

(continuous) . . . . . . -0.3 V to VDD + 0.3 V

(tw <30 ns) . . . . . . . -1.0 V to VDD + 1.0 V

Package Power Dissipation, PD . . See Graph

Operating Temperature, TA . . . -20°C to +85°C

Junction Temperature3, TJ . . . . . . . . . +150°C

Storage Temperature,TS . . . . -55°C to +150°C

1Output 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.

2Peak output current is a transient condition that

occurs during braking when the motor acts as a

generator. The 3 A level is based on the maximum

peak of a sine wave that is damped. The maximum

period between the initial brake being applied and the

current through the drivers falling to 1.4 A should not

exceed 800 ms. See Braking section for more

information.

3Fault conditions that produce excessive junction

temperature will activate device thermal shutdown

circuitry. These conditions can be tolerated, but should

be avoided.

Features

„ Pin-for-pin replacement for A8902CLBA

„ Startup commutation circuitry

„ Sensorless commutation circuitry

„ Option of external sector data tachometer signal

„ Option of external speed control

„ Oscillator operation up to 20 MHz

„ Programmable overcurrent limit

„ Transconductance gain options: 500 mA/V or 250 mA/V

„ Programmable watchdog timer

„ Directional control

„ Serial Port Interface

„ TTL-compatible inputs

„ System diagnostics data out ported in real time

„ Dynamic braking through serial port or external terminal

Always order by complete part number:

Part Number Package

A8904SLB

24-pin batwing SOIC

A8904SLB-T 24-pin batwing SOIC; Lead-free

A8904SLP

28-pin TSSOP with Exposed Thermal Pad

A8904SLP-T 28-pin TSSOP with Exposed Thermal Pad; Lead-free

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