TDA5145 Datasheet, PDF (16/24 Pages) NXP Semiconductors – Brushless DC motor drive circuit

Philips Semiconductors
Brushless DC motor drive circuit
Product specification
TDA5145
Table 4 Priority of function.
BRAKE⁽¹⁾ TEST⁽¹⁾ RESET⁽¹⁾
FUNCTION
L
L
L
normal
L
L
H
reset
L
H
L
test
L
H
H
test
H
L
L
brake
H
L
H
brake
H
H
L
brake
H
H
H
brake
Note
1. L = LOW state; H = HIGH state.
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.
June 1994
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