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L6243DS Datasheet(PDF) 1 Page - STMicroelectronics |
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L6243DS Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 8 page  L6243DS VOICE COIL MOTOR DRIVER 5-12V OPERATION PARKING FUNCTION FOR HARD DISK HEAD ACTUATOR OUTPUT CURRENT UP TO 1A DC, 1.2A PEAK LOW SATURATION VOLTAGE LOGIC AND POWER SUPPLY MONITOR LINEAR CONTROL THERMAL PROTECTION ENABLE FUNCTION CURRENT SENSE RESISTOR CONNEC- TIONS DESCRIPTION The L6243DS is a Bipolar IC developed for use in Mass Storage Head Actuator positioning applica- tions. The Power Op-Amp Output Bridge, Differ- ential Amplifier, and Error Amplifier, are control- led by TTL/CMOS, input compatible, Digital Logic, and an Analog Current Control Voltage. A simple RC compensation network, tied to the output of the Error Amp, will configure the system to work as a Transconductance Amplifier to drive a Voice Coil Motor in Linear Mode. Additional features include Power On Reset De- lay, Enable and Park. A logic low at the Park input activates the parking function. Holding the Enable input low will disable the device by forcing the outputs into a tristate mode. Power Fail Monitors for the logic and power supplies initiate an auto- matic parking sequence during a power failure. A resistor programmed parking voltage enables a constant velocity head retract. February 1998 BRIDGE POWER STAGE PARK VOLTAGE GENERATOR - + - + - + INTERNAL VOLTAGE REFERENCE - + THERMAL PROTECTION FALL TIME DELAY VCC POWER FAIL THRESHOLD (12V) PARK VOLTAGE PROGRAM PARK POWER OUT A OUT B SENSE IN B SENSE IN A SENSE OUT ERROR IN ERROR OUT VIN R2 R1 Cf Rf Rsense VOICE COIL SNUBBER VREF PARK POR VCC SENSE OUT POR DELAY LOGIC SUPPLY FILTER D96IN469 VDD B VDD A GND ENABLE LOGIC SUPPLY SENSE BLOCK DIAGRAM SO24 ORDERING NUMBER: L6243DS 1/8 |
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