June 1994

9

Philips Semiconductors

Product specification

Brushless DC motor drive circuit

TDA5144

Notes to the characteristics

1. An unstabilized supply can be used.

3. Switching levels with respect to MOT1, MOT2 and

MOT3.

4. Drivers are in the high-impedance OFF-state.

5. The outputs are short-circuit protected by limiting the

current and the IC temperature.

Fig.6 Output transition time measurement.

APPLICATION INFORMATION

(1) Value selected for 3 Hz start-up oscillator frequency.

Fig.7 Application diagram without use of the operational transconductance amplifier (OTA).