KA2811C

SMP Circuit
• 3 phase sensorless BLDC motor driver with speed discriminator
• Built-in start-up circuit with WSS (Waltz step start) method
• Suitable for high and middle end set
   (Max. output current: 2A)
• Built-in dynamic brake circuit

Vcm Circuit
• High output current driver with external NPN & PNP transistors. (Max. output current: 2A)
• No crossover distortion
• Low offset current

Other
• Low standby current
• Built-in precision power detector circuit
• Built-in TSD(Thermal Shut Down) circuit

Notes:
1. Absolute maximum ratings are values beyond which the device may be damaged permanently. Normal operation is not guaranteed at or above those extremes.
2. All voltages are measured with respect to the GND voltage level unless otherwise specified.
3. When mounted on 50mm × 50mm × 1mm PCB (Phenolic resin material).
4. Do not exceed Pd and SOA(Safe Operation Area).

The KA2811C is a monolithic one-chip IC which includes SPM (Spindle motor) driver, VCM (Voice coil motor) driver and peripheral driver, designed for driving HDD motor. For high starting torque and high speed, SPM circuit employes WSS (Waltz step start) method for starting the motor and can drive up to 2A. VCM circuit is designed to drive up to 1.5A to meet the trends of HDD'S high speed. (Requires external transistors).