SI9993CS Просмотр технического описания (PDF) - Vishay Semiconductors
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SI9993CS Datasheet PDF : 17 Pages
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Si9993CS
Vishay Siliconix
Si9993
12-V VCM/Spindle Motor Driver for Large Capacity HDD
FEATURES
• 12-V Motor Supply
• Blocking Schottky Diode Replaced by External Synchronous Rectifier
• Spindle Motor Driver Features:
– External LITTLE FOOT® Drivers for High Current/Power Application
– Constant Off-Time PWM Current Drive Minimizing Power Dissipation
– Sensorless Motor Commutation Immune to PWM Noise
– Externally Controlled Start-Up/Run Function
– Low-Jitter Commutation Output for External Speed Control
– Level Shifting Buffer Amplifier for PWM DAC
– Adjustable Output Slew Rate Control
– Unique Commutation Driver Minimizing Audible Noise
– Programmable Phase Advance for High Speed Motor
– Speed Triggered Motor Brake for Enhanced Reliability
• Voice Coil Motor Driver Features:
– External LITTLE FOOT Drivers for High Current/Power Application
– Low Crossover Distortion in Linear Mode (Class AB)
– Selectable Constant Frequency PWM or Linear Operation
– Programmable Retract Voltage Clamp
– Level Shifting Buffer Amplifier for PWM DAC
– Direct VCM Retract Control Input
– Current Sense Output for Enhanced Servo Control
– Fixed PWM Output Slew Rate Limit
• System Manager Features:
– Power-On Reset Generator
– Adjustable System Voltage Monitor
– 2.3/5.0-V±5%, 150 ppm/°C Reference Output for External PWM DAC
– Programmable Timer for Head Retract and Spindle Brake Delay
– Built-In Test Ability
• 3-Wire Synchronous Serial Data Interface
• Internal Registers and Address Decoding with Full Readback Capability
DESCRIPTION
The Si9993CS consists of a 3-phase brushless dc motor
(spindle) PWM controller and a linear/PWM transconductance
stage suitable for driving a voice coil motor (head actuator). To
meet the power handling capability required for a high
capacity hard disk drive, both drivers utilize external LITTLE
FOOT half-bridges (Siliconix Si9942 recommended). A
separate LITTLE FOOT PMOS switch (Si9430) is used as a
synchronous rectifier in place of the usual Schottky blocking
diode.
Si9993CS is manufactured in a junction-isolated BiC/DMOS
process (JIBCD15) and is available in a 64-pin SQFP
package, specified to operate over the commercial (0°C to
70°C) temperature range.
FaxBack 408-970-5600, request 70653
www.siliconix.com
S-60752–Rev. A, 05-Apr-99
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