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TDA5341

Brushless DC motor and VCM drive circuit with speed control

Philips Electronics 

Philips Semiconductors

Brushless DC motor and VCM drive circuit

with speed control

Product specification

TDA5341

FUNCTIONAL DESCRIPTION

The TDA5341 offers a sensorless three-phase motor

full-wave drive function. The device also offers protected

outputs capable of handling high currents and can be used

with star or delta connected motors.

The TDA5341 can easily be adapted for different motors

and applications.

The TDA5341 offers the following features:

• Sensorless commutation by using the motor EMF

• Built-in start-up circuit

• Optimum commutation, independent of motor type or

motor loading

• Built-in flyback diodes

• Three-phase full-wave drive

• High output current (1.3 A)

• Low MOS RDSon (1 Ω)

• Outputs protected by current limitation and thermal

protection of each output transistor

• Low current consumption

• Additional uncommitted operational amplifier

• H-bridge actuator driver current controlled with an

external series sense resistor

• Automatic retract procedure

• Adjustable park voltage

• Sleep mode

• Automatic brake (after park) procedure

• Speed control based on FLL technique

• Serial port DATAIN (24 bits)

• Friction reduction prior to spin-up.

TDA5341 modes description

The TDA5341 can be used in two main modes, depending

on whether they are controlled or not.

The ‘controlled modes’ (user commands) are executed by

the TDA5341 without delay or priority treatment, either by

software via the serial port or by hardware. BRAKE is a

hardware command whereas RETRACT can be controlled

in both ways. If it is preferable to control the heads parking

via the serial bus, the equivalent pin can be left

open-circuit.

The sleep mode is controlled by software only; it results

from the combination of the spindle and actuator being

disabled. The spindle is turned off by bit SPINDLE

DISABLE, whereas the actuator is disabled towards bit

VCM DISABLE of the serial port (see Section “Serial

port”). In addition, a special spin-up mode can be activated

in the event of high head stiction

The ‘uncontrolled modes’ only result from different failures

caused by either a too high internal temperature or an

abnormally low power voltage, which will cause the

actuator to retract and, after the spindle, to brake.

The output signals mainly affected by those failures are

RESETOUT, MOT1, 2 and 3, VCM+ and VCM−. This is

summarised in Tables 1 and 2.

Table 1 Summary of controlled modes

HARDWARE/

SOFTWARE

Software

Software

Hardware

Software/

hardware

Hardware

MODE

spindle disable

VCM disable

brake

retract

friction reduction

MOT1, 2 AND 3

high impedance

not affected

LOW

not affected

−

VCM+ AND

VCM−

high impedance

high impedance

not affected

VCM− = 0.65 V;

VCM+ = 0 V

not affected

RESETOUT

HIGH

HIGH

HIGH

HIGH

HIGH

EFFECT

spindle off

spindle on; VCM off

spindle coils ground

heads parked

heads in vibration

1997 Jul 10

7

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