SI9993CS中文資料威世科技數(shù)據(jù)手冊PDF規(guī)格書

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.

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