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A8902 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A8902 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 12 page Dwg. PP-040B 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 † 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. Always order by complete part number, e.g., A8902CLBA . 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. FEATURES s DMOS Outputs s Low rDS(on) s Startup Commutation Circuitry s Back-EMF Commutation Circuitry s Serial Port Interface s Frequency-Locked Loop Speed Control s Sector Data Tachometer Signal Input s Programmable Start-Up Current s Diagnostics Mode s Sleep Mode s Linear Current Control s Internal Current Sensing s Dynamic Braking Through Serial Port s Power-Down Dynamic Braking s System Diagnostics Data Out s Data Out Ported in Real Time s Internal Thermal Shutdown Circuitry 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF SENSING 1 2 3 4 5 6 7 8 9 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 BRAKE FILTER DATA IN LOGIC SUPPLY GROUND CHIP SELECT CLOCK RESET GROUND GROUND GROUND DD V C ST OUTA OUTB OUTC C D1 BB V LOAD SUPPLY C WD C D2 DATA OUT SECTOR DATA CENTERTAP OSCILLATOR C RES FLL MUX COMMUTATION DELAY BOOST CHARGE PUMP 8902–A |
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