SI9993CS 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 remended). A separate LITTLE FOOT PMOS switch (Si9430) is used as a synchronous...
SI9993CS Key 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 mutation Immune to PWM Noise
- Externally Controlled Start-Up/Run Function
- Low-Jitter mutation Output for External Speed Control
- Level Shifting Buffer Amplifier for PWM DAC
- Adjustable Output Slew Rate Control