Datenblatt-Suchmaschine für elektronische Bauteile |
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L6243 Datenblatt(PDF) 6 Page - STMicroelectronics |
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L6243 Datenblatt(HTML) 6 Page - STMicroelectronics |
6 / 12 page FUNCTIONAL DESCRIPTION (continued) Function Description VCC input This is the Power Supply input. POWER FAIL THRESH Input for the VCC supply monitor. The Threshold can be externally set via a voltage divider. VCC SENSE OUT Output TTL compatible signal indicating the VCC supply has dropped below the POWER FAIL THRESHOLD. LOGIC SUPPLY SENSE input This input is used to monitor the Five Volt Logic Supply for the external control and other support IC’s. The LOGIC SUPPLY SENSE operates independently of the 12V Power Supply. When a 5V supply failure is detected a POWER ON RESET is generated. 5V FILTER input This pin allows for the application of filter circuitry in order to avoid false triggering. PARK POWER input This input is used during the Power Down/Power Fail Parking operation. When the supply goes down, a typical Spindle Driver Circuit automatically tristates its output stages. During this time the spindle motor spins freely and the stored energy is used to drive the VCM to the park position. The generated BEMF is rectified and filtered across an external PARKING CAPACITOR. PROGRAMMABLE PARK VOLTAGE input Used to set the voltage applied to the VCM during an Automatic Parking Operation. PARK input Logic signal asserted low, activates parking. POWER ON RESET output Indicates an error condition to the external control and support circuitry. A Logic Supply Fail condition automatically initiates a POWER ON RESET. Internal 30k Pullup to LSS. POWER ON RESET DELAY input The intent of this input is to provide a time delay at power up. During this time, the POWER ON RESET line will be asserted (low). A POWER ON RESET, will hold the system in the PARK mode. Once the delay has timed out, the POWER ON RESET will be removed to allow the external system to assume control. When applied in a Disk Drive Application, the POWER ON RESET DELAY will be required to have a minimum duration which will ensure that the Read/Write Heads can be fully parked. WRITE DISABLE output Becomes asserted a few microseconds prior to the assertion of POWER ON RESET. Internal 30k Pullup to LSS. ENABLE input This signal originates at the external controller and, when asserted, allows the VCM Drivers to operate. When deasserted the VCM Driver is forced into Tristate mode. During a POWER ON RESET condition however, the parking operation is automatic and takes priority over the ENABLE function. Only at the end of the POWER ON RESET DELAY will the ENABLE input become active. If active parking is desired, it will be accomplished under control of the VIN signal, otherwise it is an automatic function at power down. VREF input The reference voltage input is basically that voltage, at which the output current is zero. ERROR AMP IN input Inverting input of error amplifier. The non inverting one is internally tied to Vref. Open collector output. ERROR AMP OUT output Error amplifier output pin. OUTPUT A power output Voice Coil power output. OUTPUT B power output Voice Coil power output. SENSE AMP IN A/B signal input Sense amplifier input pins. The sense resistor is connected across these pins. SENSE AMP OUT signal output Output pin of sense amplifier. AMPOUT output Output of an internal op-amp for general application. AMP+ input General purpose op-amp non inverting input. AMP- input General purpose op-amp inverting input. L6243-L6243D 6/12 |
Ähnliche Teilenummer - L6243 |
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Ähnliche Beschreibung - L6243 |
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