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Número de pieza	TDA3629T
Descripción	Light position controller
Fabricantes	NXP Semiconductors
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No Preview Available ! INTEGRATED CIRCUITS DATA SHEET TDA3629 Light position controller Product speciﬁcation File under Integrated Circuits, IC18 1996 Sep 04 1 page Philips Semiconductors Light position controller Product speciﬁcation 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 VSET to VP circuit prevents the motor from rotating when the voltage at the VSET input is above 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 VSET short-circuited to ground is also present. The motor will be stopped if VSET becomes lower than the threshold level. The shaded areas in Fig.4 represent the parts where the 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. handbook, halfpage 100 position (%) MGE635 0 0 VSET(min) VSET(max) Vb VSET (V) Fig.4 Conversion gain. 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 5 Page 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 RSET 1 kΩ + VSET − +Vb 2.2 kΩ RFB + VFB − SET FB +Vb 43 V 47 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 11 Page

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