TDA5142T Datasheet, PDF (16/20 Pages) NXP Semiconductors – Brushless DC motor drive circuit

Philips Semiconductors
Brushless DC motor drive circuit
BRAKE FUNCTION
• If the voltage on pin 8 is <2.3 V the motor brakes; in this
condition the external outputs are driven to a HIGH
voltage level.
• If pin 8 is floating or the voltage is >2.7 V the motor
runs normally.
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 in such a way that the transistors are switched
off when the local temperature becomes too high.
Product specification
TDA5142T
June 1994
16