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TDA3629 Datasheet(PDF) 6 Page - NXP Semiconductors |
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TDA3629 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 28 page 1996 Sep 04 6 Philips Semiconductors Product specification 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 T1 and indicated by VSET) and the input current ISET becomes higher than the reference current Iref (at time T2), the motor 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. Fig.5 Timing diagram. handbook, full pagewidth VSET VFB ISET Iref absolute motor current V2 V1 V1 0 0 T1 T2 T3 T4 time MGE636 V2 |
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