TDA3629 데이터 시트보기 (PDF) - Philips Electronics

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TDA3629

Light position controller

Philips Electronics 

Philips Semiconductors

Light position controller

Product specification

TDA3629

Application diagrams and additional information

Two possible application diagrams are shown. The first

(see Fig.9) shows the best case: the lowest component

count. The second (see Fig.10) shows additional

components which may be necessary. Two capacitors are

added to meet EMC requirements (one on the VP pins, the

second one between the set and feedback input pins).

A third capacitor has been added across the motor to

suppress current spikes. The given values of these

capacitors have to be optimized by experiments carried

out on the total application. The resistors do not have to

have the same value. The voltage hysteresis is set by

means of RSET.

The resistor in the feedback input line (RFB) is present to

limit the current during the transients as illustrated in Figs 7

and 8. This resistor should have a value larger than 2 kΩ.

RSET can be chosen freely but must also be larger than

2 kΩ. A diode is placed in series with the supply line in both

applications to protect the device from reverse polarity

switching and from damage caused by pulses 1 and 3 in

Figs 7 and 8. In the present application a varistor is

included in the motor. The electrolytic capacitor of 47 µF

should have a very low ESR, for instance as low as 5 Ω at

a temperature of −40 °C. An extra ceramic capacitor

(approximately 100 nF) parallel to it is obligatory when this

can not be guaranteed.

handbook, full pagewidth

+Vb

1 kΩ

RSET SET

+

VSET

−

+Vb

2.2 kΩ

RFB FB

+

VFB

−

+Vb

47

43 V µF

VP1 VP2

TDA3629

ISET

INPUT

STAGE

ISET

PROTECTION

- OVER VOLTAGE

- UNDER VOLTAGE

- TEMPERATURE

SUPPLY

SHORT-CIRCUIT

BROKEN WIRE

WINDOWS

AND

COMPARATORS

VP

OUT1 Im

OUTPUT

STAGES

VP

+

Vm M

−

OUT2

Iref

MECHANICAL

TRANSMISSION

Fig.9 Best case application diagram.

MGE640

1996 Sep 04

11

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