 | Author | Message | | | Lily-Lee | | Posted: Sun Aug 03, 2008 7:06 am Post subject: TDA3629T pdf and datasheet | | | | Joined: 22 May 2008 Posts: 32 | TDA3629T pdf and datasheet:
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).h 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 160C. 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 VSETtoVP 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. Figure4 shows that a position of 0mm 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. | |
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