TDA3629 데이터 시트보기 (PDF) - Philips Electronics

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TDA3629

Light position controller

Philips Electronics 

Philips Semiconductors

Light position controller

Product specification

TDA3629

The timing can be divided into several parts starting from

a steady state (see Fig.5, the starting point, and Fig.10 for

the application diagram): in this state (until T1) a large

reference current is active, indicated by the dotted lines.

When the setting potentiometer is rotated (started at T1

and indicated by VSET) and the input current ISET becomes

higher than the reference current Iref (at time T2), the motor

will start and the input current will decrease. At the same

time the reference current is switched to a low level.

During rotation of the motor the input current will decrease

until it becomes lower than this low reference current;

this occurs at time T4. At this time the brake becomes

active, the motor will stop and the reference current is set

to the higher value. The brake is realized by

short-circuiting the motor. In general: this system does not

use a linear adaptation strategy but an on-off strategy.

This results in high accuracy and low noise sensitivity.

The brake is active at any time during normal operation

when the motor is not active. The polarity of the feedback

potentiometer should be such that the voltage at the slider

of the feedback potentiometer increases when OUT1 is

high and OUT2 is low.

handbook, full pagewidth

V2

VSET

V1

V2

VFB

V1

ISET

0

Iref

absolute

motor

current

0

T1 T2 T3

time

T4

MGE636

Fig.5 Timing diagram.

1996 Sep 04

6

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