TDA5145 datasheet(15/24 Pages) PHILIPS

15 / 24 page

June 1994

Philips Semiconductors

Product speciﬁcation

Brushless DC motor drive circuit

TDA5145

MOTOR CONTROL

DC motors can be controlled in an analog manner using

the OTA.

For the analog control an external transistor is required.

The OTA can supply the base current for this transistor

and act as a control amplifier (see Fig.8).

DIRECTION FUNCTION

If the voltage at pin 10 is <0.8 V, the motor is running in

one direction (depending on the motor connections). If the

voltage at pin 10 >2.0 V, the motor is running in the other

direction.

BRAKE FUNCTION

If the voltage at pin 9 is >2.0 V, the motor brakes. In that

condition, the 3 outputs MOT1, MOT2 and MOT3 are

forced at a LOW voltage level and the current limitation is

done internally by the sink drivers.

RESET FUNCTION

If the voltage at pin 21 is >2.0 V, the output states are

shown in Table 2.

Table 2

Output states if VRESET > 2.0 V.

Note

1. Z = high-impedance OFF-state; L = LOW state;

H = HIGH state.

DRIVER OUTPUT

STATE(1)

MOT1

MOT2

MOT3

Table 3

Switching sequence after a reset pulse.

Note

1. Z = high-impedance OFF-state; L = LOW state; H = HIGH state.

DIR(1)

RESET(1)

MOT1(1)

MOT2(1)

DIR(1)

FUNCTION

reset

normal direction mode

sequence

HLHL

HLH

reset

reverse direction mode

sequence

LZL

LLL

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