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L6268 数据表(PDF) 1 Page - STMicroelectronics |
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L6268 数据表(HTML) 1 Page - STMicroelectronics |
1 / 17 page GENERAL 12V (+/- 10%) OPERATION. REGISTER BASED ARCHITECTURE MINIMUM EXTERNAL COMPONENTS BICMOS + VERTICAL DMOS (1.5mm) VCM DRIVER 1.5A DRIVE CAPABILITY 0.9W TOTAL BRIDGE IMPEDANCE AT 25 °C LINEAR MODE PHASE SHIFT MODULATION (PWM MODE) INSTANTANEOUS, (GLICH FREE) SWITCH BETWEEN THE 2 MODES CLASS AB OUTPUT DRIVERS ZERO CROSSOVER DISTORSION 14 BIT DAC DEFINE OUTPUT CURRENT SELECTABLE TRANSCONDUCTANCE 4 PROGRAMMABLE PARKING VOLTAGE DYNAMIC BRAKE SPINDLE DRIVER 2.0A DRIVE CAPABILITY 0.8W TOTAL BRIDGE IMPEDANCE AT 25 °C BEMF, INTERNAL OR EXTERNAL, PROC- ESSING SENSOR-LESS MOTOR COMMUTATION PROGRAMMABLE COMMUTATION PHASE DELAY LINEAR MODE AND CONSTANT TOFF PWM OPERATION MODE INTERNAL FREQUENCY LOCKED LOOP SPEED CONTROL (FLL) BEMF RECTIFICATION DURING RETRACT BUILT-IN ALIGNAMENT&GO START-UP INDUCTIVE SENSING START UP OPTION RESYNCHRONIZATION DYNAMIC & REVERSE BRAKE CONTROLLABLE OUTPUT SLEW RATE OTHER FUNCTIONS 12V AND 5V MONITORING WITH EXTERNAL SET TRIP POINTS AND HYSTERESIS POWER UP/DOWN SEQUENCING LOW VOLTAGE SENSE 3.3V INPUT LOGIC COMPATIBILITY THERMAL SHUTDOWN AND PRETHERMAL WARNING DESCRIPTION The L6268 integrates into a single chip both spin- dle and VCM controllers as well as power stages. The device is designed for 12V disk drive applica- tion requiring up to 2.0A of spindle and 1.5A of VCM peak currents. A serial port with up to 25 MHz capability provides easy interface to the microprocessor. A register controlled Frequency Locked Loop (FLL) allows flexibility in setting the spindle speed. Integrated BEMF processing, digital masking, digital delay, and sequencing minimize the number of external components required. Power On Reset (POR) circuitry is included. Upon detection of a low voltage condition, POR is as- serted, the internal registers are reset, and spin- dle power circuitry is tri-stated. The BEMF is recti- fied providing power for actuator retraction followed by dynamic spindle braking. The device is built in BICMOS technology allow- ing dense digital/analog circuitry to be combined with a high power DMOS output stage. This is preliminary information on a new product now in development. Details are subject to change without notice. April 1999 ® TQFP44 (10x10mm with slug) ORDERING NUMBER: L6268 L6268 12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO” PRODUCT PREVIEW BICMOS TECHNOLOGY 1/17 |
类似零件编号 - L6268 |
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类似说明 - L6268 |
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