Philips tda3629 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA3629

Light position controller

Product speciﬁcation File under Integrated Circuits, IC18

1996 Sep 04

Philips Semiconductors Product speciﬁcation

Light position controller TDA3629

FEATURES

• Low positional error

• Low noise sensitivity due to hysteresis

• Low supply current

• Thermally protected

GENERAL DESCRIPTION

The Light position controller (Leucht Weiten Steller, LWS) is a monolithic integrated circuit intended to be used in passenger cars. This device adapts the elevation of the light beam of the head light of the car to a state defined by the car driver using a potentiometer on the dashboard.

• Broken wire and short-circuit indication on SET input

• Brake function by short-circuiting the motor

• Hysteresis level set externally.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

P(ss)

supply current, steady state note 1 − − 6 mA

IP− Im supply current, motor active Im < 900 mA − − 80 mA

Vm output voltage Im < 700 mA VP− 2.9− − V

Im output current VP≥ 12.3 V 670 − − mA I

 motor switch on current level VP= 12 V 6 9 12 µA

SET

Note

1. Steady state implies that the motor is not running (Im= 0) and V

= VFB= 0.5VP.

SET

ORDERING INFORMATION

TYPE NUMBER

NAME DESCRIPTION VERSION

TDA3629 DIP8 TDA3629T SO16

PACKAGE

plastic dual in-line package; 8 leads (300 mil) plastic small outline package; 16 leads; body width 3.9 mm

SOT97-1

SOT109-1

1996 Sep 04 2

Philips Semiconductors Product speciﬁcation

Fig.1 Block diagram.

handbook, full pagewidth

MGE632

INPUT

STAGE

SHORT-CIRCUIT

SUPPLY

BROKEN WIRE

PROTECTION

- OVER VOLTAGE

- UNDER VOLTAGE

- TEMPERATURE

WINDOWS

AND

COMPARATORS

OUT1

OUTPUT STAGES

OUT2

SET

7(12)2(5)

8(16)

1(1)

3(6)

5(9)

6(11)

SET

ref

TDA3629

Pin numbers in parenthesis represent the TDA3629T.

Light position controller TDA3629

BLOCK DIAGRAM

1996 Sep 04 3

Philips Semiconductors Product speciﬁcation

Fig.2 Pin configuration TDA3629.

handbook, halfpage

MGE633

TDA3629

1 2 3 4

8 7 6 5

OUT1

n.c.

SET V

OUT2 GND

Fig.3 Pin configuration TDA3629T.

handbook, halfpage

TDA3629T

MGE634

1 2 3 4 5 6 7 8

FB n.c. n.c. n.c.

OUT1

n.c. n.c.

SET n.c. n.c. n.c. V

OUT2 n.c. GND

16 15 14 13 12 11 10

Light position controller TDA3629

PINNING

SYMBOL

DESCRIPTION

TDA3629 TDA3629T

FB 1 1 feedback input

2 5 supply voltage 1

OUT1 3 6 output 1

(1)

n.c.

4 2 to 4, 7, 8, 10, 13 to 15 not connected GND 5 9 ground OUT2 6 11 output 2 V

7 12 supply voltage 2 SET 8 16 set input

Note

1. The pins which are not electrically connected should be connected to a copper area of the printed-circuit board which is as large as possible to improve heat transfer.

1996 Sep 04 4

Philips Semiconductors Product speciﬁcation

Fig.4 Conversion gain.

handbook, halfpage

MGE635

100

position

(%)

SET(min)

SET(max)

SET

(V)

Light position controller TDA3629

FUNCTIONAL DESCRIPTION

The device is intended to control the elevation of the light beam of a head light of a passenger car. The driver can control the elevation of the light beam by rotating a potentiometer on the dashboard (the setting potentiometer). The device adapts the elevation of the light beam by activating the control motor. The elevation of the head light is fed back to the device by a second potentiometer (the feedback potentiometer). This feedback potentiometer is mechanically coupled to the motor.

The device operates only when the supply voltage is within certain limits. The device is switched off outside these boundaries. The under voltage detection detects whether the supply voltage is below the under voltage threshold. The motor will not be activated when this occurs, but it remains short-circuited by the output stages. The over voltage will switch off the total device when the supply voltage is higher than the over voltage threshold.

A thermal protection circuit becomes active if the junction temperature exceeds a value of approximately 160 °C. This circuit will reduce the motor current, which will result in a lower dissipation and hence a lower chip temperature. This condition will only occur when the motor is blocked at high ambient temperature.

A detection of a broken wire of the slider of the setting potentiometer is included because it will be connected to the device by a wire several meters long. This detection circuit prevents the motor from rotating when the wire is broken. In this event the brake will remain active.

The protection of V from rotating when the voltage at the V

to VP circuit prevents the motor

SET

input is above

SET

the threshold value. This can be used to detect whether the wire from the slider of the setting potentiometer is short-circuited to the battery line. A protection of V

SET

short-circuited to ground is also present. The motor will be stopped if V The shaded areas in Fig.4 represent the parts where the

becomes lower than the threshold level.

SET

short-circuit protection stages are active. Figure 4 shows that a position of 0 mm can not be reached, neither can a position of 100%. The minimum position that can be reached depends on the battery voltage Vb, although the maximum position does not.

The device is protected against electrical transients which may occur in an automotive environment. The device will shut off when positive transients on the battery line occur (see Figs 7 and 8). The motor will not be short-circuited in this event. The flyback diodes, illustrated in Fig.1, will remain present. The state of the output stages at the moment when the transient starts is preserved by internal flip-flops. Negative transients on the battery line (see Figs 7 and 8) will result in a set short-circuited to ground fault detection, because it will result in a voltage at the setting input which is below the short-circuited to ground threshold. The device however discharges the electrolytic capacitor during these transients. It will stop functioning when the resulting supply voltage becomes too low.

1996 Sep 04 5

Philips Semiconductors Product speciﬁcation

Fig.5 Timing diagram.

handbook, full pagewidth

SET

ref

absolute

motor

current

T1T2T

time

MGE636

Light position controller 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 T and indicated by V higher than the reference current I

) and the input current I

SET

(at time T2), the motor

ref

SET

becomes

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.

1996 Sep 04 6

Philips Semiconductors Product speciﬁcation

Light position controller TDA3629

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134). All voltages are deﬁned with respect to ground. Positive currents ﬂow into the device. Values measured in Fig.10.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V V T T T V R t

block

n es stg amb vj b, tr L

supply voltage operating 8 18 V

non-operating −0.3 +50 V voltage on any other pin −0.3 VP+ 0.3 V electrostatic handling note 1 −3 +3 kV storage temperature −55 +150 °C ambient temperature −40 +105 °C virtual junction temperature note 2 −50 +150 °C voltage transients on V

note 3 −150 +100 V load resistance note 4 10 − Ω cumulative blocking time Im = 700 mA − 100 h

Notes

1. Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 kΩ resistor.

2. In accordance with IEC 747-1. An alternative definition of virtual junction temperature Tvj is: Tvj= T the allowable combinations of power dissipation Pd and ambient temperature T

amb

+ Pd× R

th vj-amb

, where R

is a fixed value to be used for the calculation of Tvj. The rating for Tvj limits

th vj-amb

. Additional information is given in

amb

section “Thermal aspects” in chapter “Test and application information”.

3. Wave forms illustrated in Figs 7 and 8 applied to the application diagram, Fig.10.

4. Vb= 13 V; T

= 25 °C; duration 50 ms maximum; non repetitive.

amb

THERMAL CHARACTERISTICS

In accordance with IEC 747-1.

SYMBOL PARAMETER VALUE UNIT

th vj-amb

thermal resistance from junction to ambient in free air

TDA3629 100 K/W TDA3629T 105 K/W

1996 Sep 04 7

Philips Semiconductors Product speciﬁcation

Light position controller TDA3629

CHARACTERISTICS

VP= 12 V; RL= 14 Ω. All voltages are deﬁned with respect to ground. Positive currents ﬂow into the device. Values measured in Fig.10 with R

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

P(min)

P(max)

P(ss)

under voltage threshold 6 − 8 V over voltage threshold T

supply current, steady state note 1 − − 6 mA

IP− Im supply current, motor active Im < 400 mA; note 2 − − 40 mA

Setting input (SET)

SET

SET(sc)

operating voltage 1.5 − 0.95VPV input current R wire short-circuited to ground

threshold wire short-circuited to battery

threshold

∆V

SET

broken ground set pull-up note 3 − − 160 mV

Feedback input (FB)

FB(max)

voltage 1.5 − 0.95VPV maximum input current RFB> 20 kΩ −250 − +250 µA

Motor outputs

V

 output voltage Im < 700 mA;

Im output current VP≥ 12.3 V;

= RFB= 20 kΩ; unless otherwise speciﬁed.

SET

= 25 °C 18 − 22 V

amb

= −40 to +105 °C 17.5 − 22.8 V

amb

Im < 900 mA; note 2 − − 80 mA

> 20 kΩ −250 − +250 µA

SET

output stages switched off − − 1 V

output stages switched off V

= 25 °C; note 2

amb

Im < 700 mA; T

= −40 to +105 °C;

amb

note 2

= 25 °C; note 2

amb

VP≥ 12.3 V; T

= −40 to +105 °C;

amb

note 2

− − V

VP− 2.9 − − V

VP− 3.4 − − V

670 − − mA

635 − − mA

Reference current

I

 motor switch-on level VP= 12 V 6 9 12 µA

SET

VP= 18 V 9 13 17 µA

motor switch-off level − 2.5 − µA

1996 Sep 04 8

Philips Semiconductors Product speciﬁcation

Fig.6 Conditions for the test of note 3.

The 170 Ω, 830 Ω and 390 Ω resistors form the setting potentiometer in its worst case position. The given situation (combination of Vb, R

SET

and the

position of the set potentiometer) forms the worst case situation. The given maximum of ∆V

SET

guarantees that any other module, connected to the

same set potentiometer, will not start to activate its motor, when its motor switch-on level is higher than 0.01V

SET

≥ 20 kΩ).

handbook, halfpage

MGE637

SET

SET, br

battery

ground

830 Ω

390 Ω

170 Ω

REMAINDER OF MODULE

ground wire not connected

−

Light position controller TDA3629

Notes to the characteristics

1. Steady state implies that the motor is not running (Im= 0) and V

2. This is only valid when the temperature protection is not active.

3. ∆V

is the difference in voltage on the set potentiometer between the situation when the ground wire is interrupted

SET

) and voltage on the set potentiometer during normal operation (when V

SET, br

The conditions for this test are: R

= 20 kΩ; Vb= 16 V; ∆V

SET

= V

− 2.72 V; see Fig.6.

SET, br

= VFB= 0.5VP.

SET

= 0.17Vb= 2.72 V).

SET

QUALITY SPECIFICATION

The quality of this device is in accordance with found in the

1996 Sep 04 9

“Quality reference Handbook”

“SNW-FQ-611 part E”

. The numbers of the quality specification can be

. The handbook can be ordered using the code 9397 750 00192.

+ 19 hidden pages