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L6515 Datasheet(PDF) 2 Page - STMicroelectronics |
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L6515 Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 13 page  SYSTEM DESCRIPTION The L6515 is intended to be used as a microproc- essor controlled positioning system. For the motor driver stage only digital operating bridges are needed like L293E, L298, L6203, L6202. The system operates in two modes to achieve high-speed, high-accurancy positioning. Speed commands for the system originate in the microprocessor. It is continuously updated on the motor position by means of pulses from the con- troller chip, which in turn gets its information from the encoder. From this basic input, the microproc- essor computes a 6-bit control word that sets the system speed and direction dependent on the dis- tance to travel. When the motor is stopped and the microproces- sor orders it to a new position, the system oper- ates initially in an open-loop configuration as there is no feedback from the tachometer gener- ator. Therefore maximum current is fed to the mo- tor. As maximum speed is reached, the tachome- ter chip output backs off the processors signal thus reducing accelerating torque. The motor con- tinues to run at top speed but under closed-loop control. As a target position is approached, the microproc- essor lowers the value of the speed-demand word; this reduces the voltage at the main sum- ming point, in effect braking the motor. The brak- ing is applied progressively until the motor is run- ning at minimum speed. At that time, the microprocessor orders a switch to the position mode, and within 3 to 4ms the power stage drives the motor to a null position, where it is held by electronic ”detening”. Symbol Parameter Value Unit VS Supply Voltage 12 V VIA Analog Inputs Voltage -0.3 to 7 V VIL Logic Inputs Voltage -0.3 to 7 V VO Open Collector Output Current 12 V IO Open Collector Current 10 mA IZ Zener Current 20 mA Tstg, Tj Storage Temperature -40 to 150 °C Tamb Operative Ambient Temperature 0 to 70 °C ABSOLUTE MAXIMUM RATINGS PIN CONNECTION (top view) L6515 2/13 |
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Similar Description - L6515 |
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