描述 Description

GENERAL DESCRIPTION
Overview
The OM5193H is a combination of a voice coil motor and a spindle motor driver with embedded servo controller designed for use in disk drives. Configuration and control registers are set via a 3-wire serial port running up to 30 MHz to interface commonly to a microcontroller or a digital signal processor.
The device operates at 5 and 12 V power supplies and integrates safety functions such as power stages overvoltage protection, power and temperature monitor, over-temperature shutdown and dynamic brake-after-park.
The device is contained in a QFP80 package with 18 pins connected to the leadframe thus providing low thermal resistance.FEATURES
Servo control
? 10-bit VCM Digital-to-Analog Converter (DAC)
? 7-channel 10-bit Analog-to-Digital Converter (ADC)
? Programmable spindle commutation control logic
? 3-wire serial interface
? Two stand-alone operational amplifiers (op-amps) with outputs connected to the ADC
? Analog multiplexer with two inputs used to select VCM seek mode or track-following mode.Motor control
SPINDLE MOTOR DRIVER
? 3-phase output motor driver
? 1.9 A maximum available start-up current
? Total Rds(on) = 0.6 ? (typical) at 25 °C
? Back ElectroMotive Force (BEMF) processing for sensorless motor commutation
? Linear current control
? External current sense resistor
? External current control loop compensation
? Adjustable slew rate control
? Short-circuit brake
? Adjustable brake-after-park delay time.VOICE COIL MOTOR DRIVER
? 1.5 A maximum current capability
? Total Rds(on) = 0.8 ? (typical) at 25 °C
? Linear class AB output with low cross-over distortion delay
? Precision current control loop with external current sense resistor
? Programmable seek and track-following mode with adjustable current loop gain
? External current control loop compensation
? Precharge during brake mode
? 20 kHz current control loop bandwidth
? Parking function
? Adjustable park voltage with limiter.Miscellaneous items
? Precision low voltage 5 and 12 V power monitor with hysteresis
? Precision internal voltage reference for servo and power control circuits
? Thermal sense circuit with over-temperature shutdown sensor
? Internal charge pump voltage generator
? Automatic brake-after-park at power-down, thermal shutdown or sleep mode
? Sleep mode: low power consumption mode.APPLICATIONS
? 12 V hard disk drive products.

特性 Features

Servo control
? 10-bit VCM Digital-to-Analog Converter (DAC)
? 7-channel 10-bit Analog-to-Digital Converter (ADC)
? Programmable spindle commutation control logic
? 3-wire serial interface
? Two stand-alone operational amplifiers (op-amps) with outputs connected to the ADC
? Analog multiplexer with two inputs used to select VCM seek mode or track-following mode.Motor control
SPINDLE MOTOR DRIVER
? 3-phase output motor driver
? 1.9 A maximum available start-up current
? Total Rds(on) = 0.6 ? (typical) at 25 °C
? Back ElectroMotive Force (BEMF) processing for sensorless motor commutation
? Linear current control
? External current sense resistor
? External current control loop compensation
? Adjustable slew rate control
? Short-circuit brake
? Adjustable brake-after-park delay time.VOICE COIL MOTOR DRIVER
? 1.5 A maximum current capability
? Total Rds(on) = 0.8 ? (typical) at 25 °C
? Linear class AB output with low cross-over distortion delay
? Precision current control loop with external current sense resistor
? Programmable seek and track-following mode with adjustable current loop gain
? External current control loop compensation
? Precharge during brake mode
? 20 kHz current control loop bandwidth
? Parking function
? Adjustable park voltage with limiter.Miscellaneous items
? Precision low voltage 5 and 12 V power monitor with hysteresis
? Precision internal voltage reference for servo and power control circuits
? Thermal sense circuit with over-temperature shutdown sensor
? Internal charge pump voltage generator
? Automatic brake-after-park at power-down, thermal shutdown or sleep mode
? Sleep mode: low power consumption mode.