TDA3629 datasheet(13/28 Pages) PHILIPS

13 / 28 page

1996 Sep 04

Philips Semiconductors

Product speciﬁcation

Light position controller

TDA3629

Table 1

Duration of the pauses

The maximum allowable dissipated power P is then

0.77 W during the motor active periods in the event of a

DIP8 package being used. Dissipation pulses due to

starting and stopping the motor can be ignored because of

their short duration. This maximum allowable dissipated

power implies that the maximum continuous motor current

(

I

m) is approximately 250 mA during the motor active

periods when the supply voltage VP is 13 V. The maximum

allowable dissipated power P is 0.67 W during the motor

active periods in the event of a SO16 package being used.

This implies that the maximum continuous motor current

(

I

m) is approximately 220 mA during the motor active

periods when the supply voltage (VP) is 13 V.

Tamb (°C)

PAUSE (s)

<95

180

95 to 105

300

Fig.11 Thermal transient test.

The duration of the pause depends on the ambient temperature, see

Table 1.

handbook, halfpage

MGE642

active

motor

inactive

pause

8 s

4 s

time (s)

Stereo operation

The default application will be when two modules are

driven by one set potentiometer. One module controls the

left head light, where the other one controls the right head

light. Each module is connected by three wires: the battery

line, the ground line and the set input wire. This can result

in two additional fault conditions: from one module the

battery line or the ground line can be broken, when the

other module is still connected. Assume that the left one

operates normally, where the right one has a fault. The

setting potentiometer will have extra loading when the

battery line is broken. This will result in a lower voltage at

the wiper of the setting potentiometer. Thus the left module

will start to regulate until a new equilibrium is reached.

The amount of extra loading can be influenced by the

external series resistor in the set input. These fault

conditions and their implications should be considered

when the total application is designed.

Test diagram

All parameters in chapter “Characteristics” until this

section are measured at Tamb = 25 °C and are tested at

each device using the test set-up of Fig.12. The only

exceptions are parameters supply current (motor active)

and output voltage (motor output) where the 1 k

Ω output

resistor is replaced by an appropriate current source.

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