TDA5145 Ver la hoja de datos (PDF) - Philips Electronics

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TDA5145

Brushless DC motor drive circuit

Philips Electronics 

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

16

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