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8902A

Allegro MicroSystems
Part Number 8902A
Manufacturer Allegro MicroSystems
Description 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING
Published Mar 22, 2005
Detailed Description 8902–A 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING LOAD SUPPLY C D2 C WD CST OUTA GROUND GROUND O...
Datasheet PDF File 8902A PDF File

8902A
8902A

Overview
8902–A 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING LOAD SUPPLY C D2 C WD CST OUTA GROUND GROUND OUT B OUT C CENTERTAP BRAKE C RES 1 2 V BB COMMUTATION DELAY 24 23 C D1 DATA IN CLOCK CHIP SELECT RESET GROUND GROUND DATA OUT OSCILLATOR LOGIC SUPPLY SECTOR DATA FILTER Data Sheet 26301.
2 SERIAL PORT 3 4 5 6 7 8 9 9 10 11 12 BOOST CHARGE PUMP 22 21 20 19 18 The A8902CLBA is a three-phase brushless dc motor controller/ driver for use in 5 V or 12 V hard-disk drives.
The three half-bridge outputs are low on-resistance n-channel DMOS devices capable of driving up to 1.
25 A.
The A8902CLBA 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.
The A8902CLBA 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 A8902CLBA is provided in a 24-lead wide-body SOIC batwing package.
It provides for the smallest possible construction in surface-mount applications.
MUX FLL VDD 17 16 15 14 13 Dwg.
PP-040B FEATURES s s s s s s s s s s s s s s s s s DMOS Outputs Low rDS(on) Startup Commutation Circuitry Back-EMF Commutation Circuitry Serial Port Interface Frequency-Locked Loop Speed Control Sector Data 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 ABSOLUTE MAXIMUM RATINGS at TA = +25°C Load Supply Voltage, VBB .
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