TDA5140AT 查看數據表（PDF） - Philips Electronics

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TDA5140AT

Brushless DC motor drive circuit

Philips Electronics 

Philips Semiconductors

Brushless DC motor drive circuit

Product specification

TDA5140A

Fig.10 Timing and the FG and PG IN signals.

The special PG pulse is derived from the negative-going

zero-crossing from the MOT3 output (pin 16). The external

PG signal (PG IN on pin 5) must sense a positive-going

voltage (>80 mV) within 1.5 to 7.5 commutation periods

before the negative-going zero-crossing in MOT3

(see Fig.10).

The voltage requirements of the PG IN input are such that

an inexpensive pick-up coil can be used as a sensor

(see Fig.11).

Example: If p = 6, then one revolution contains 6 × 6 = 36

commutations. The tolerance is 6 periods, that is 60

degrees (mechanically) or 6.67 ms at 1500 rpm.

If a PG sensor is not used, the PG IN input must be

grounded, this will result in a 50% duty factor FG signal.

2.2 kΩ

PG IN

22 nF

GND2

MBD696

Fig.11 Pick-up coil as PG sensor.

April 1994

15

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