8905

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 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 CENTERTAP BRAKE C RES ABSOLUTE MAXIMUM RATINGS at TA = +25°C Load Supply Voltage, VBB . . . . . . 14 V Output Current, IOUT . . . . . . . . ±1.25 A Logic Supply Voltage, VDD . . . . 6.0 V Logic Input Voltage Range, VIN . . . . . . . -0.3 V to VDD + 0.3 V Package Power Dissipation, PD . . . . . . . . . . . . . . . . See Graph Operating Temperature Range, TA . . . . . . . . . . . . . . 0°C to +70°C Junction Temperature, TJ . . . +150°C† Storage Temperature Range, TS . . . . . . . . . . . . -55 °C to +150°C † ...