OM5193 데이터 시트보기 (PDF) - Philips Electronics

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OM5193

Disk drive spindle and VCM with servo controller

Philips Electronics 

Philips Semiconductors

Disk drive spindle and VCM with

servo controller

Product specification

OM5193H

1 FEATURES

1.1 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.

1.2 Motor control

1.2.1 SPINDLE MOTOR DRIVER

• 3-phase output motor driver

• 1.9 A maximum available start-up current

• Total Rds(on) = 0.6 Ω (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.

1.2.2 VOICE COIL MOTOR DRIVER

• 1.5 A maximum current capability

• Total Rds(on) = 0.8 Ω (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.

1.3 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.

2 APPLICATIONS

• 12 V hard disk drive products.

3 GENERAL DESCRIPTION

3.1 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.

3.2 Servo controller

The servo controller includes the following circuits:

• 3-wire serial interface

• Spindle commutation logic

• A 10-bit ADC with 7 inputs selected by an internal

multiplexer

• A 10-bit VCM DAC with 1.5, 2.5 and 3.5 V voltage

references

• Two low-offset stand-alone op-amps

• Analog multiplexer with 2 inputs.

1998 Nov 02

3

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