8905 Datasheet (Allegro MicroSystems) - 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING

8905, 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING

Power Outputs.

The power outputs of the A8905CLB are n-channel DMOS transistors with a total source plus sink rDS(on) of typically 1.1 Ω.

Internal charge pump boost circuitry provides voltage above supply for driving the high-side DMOS gates.

Intrinsic ground clamp and flyback diodes provide protect

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

8905 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 1 2 V BB COMMUTATION DELAY 24 23 C D1 DATA IN CLOCK CHIP SELECT RESET SERIAL PORT 3 4 5 6 7 22 21 20 19 OUTA GROUND GROUND OUT B OUT C