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TDA5143

Brushless DC motor drive circuit

Philips Electronics 

Philips Semiconductors

Brushless DC motor drive circuit

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.6).

RELIABILITY

It is necessary to protect high current circuits and the

output stages are protected in two ways:

• Current limiting of the ‘lower’ output transistors. The

‘upper’ output transistors use the same base current as

the conducting ‘lower’ transistor (+15%). This means

that the current to and from the output stages is limited.

• Thermal protection of the six output transistors is

achieved by each transistor having a thermal sensor

that is active when the transistor is switched on. The

transistors are switched off when the local temperature

becomes too high.

It is possible, that when braking, the motor voltage (via the

flyback diodes and the impedance on VMOT) may cause

higher currents than allowed (>0.6 A). These currents

must be limited externally.

Product specification

TDA5143T

June 1994

15

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