TDF5140A データシートの表示（PDF） - Philips Electronics

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TDF5140A

Brushless DC motor drive circuit

Philips Electronics 

Philips Semiconductors

Brushless DC motor drive circuit

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PG IN

tolerance on PG IN

Product specification

TDF5140A

MOT3

PG/FG

Fig.8 Timing and the FG and PG IN signals.

MGH319

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.8).

The voltage requirements of the PG IN input are such that

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

(see Fig.9).

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.9 Pick-up coil as PG sensor.

1999 March 15

15

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