L6243 데이터 시트보기 (PDF) - STMicroelectronics

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L6243

VOICE COIL MOTOR DRIVER

STMicroelectronics 

L6243-L6243D

FUNCTIONAL DESCRIPTION (continued)

Function

VCC input

POWER FAIL

THRESH

VCC SENSE OUT

Output

LOGIC SUPPLY

SENSE input

5V FILTER input

PARK POWER

input

PROGRAMMABLE

PARK VOLTAGE

input

PARK input

POWER ON

RESET output

POWER ON

RESET DELAY

input

WRITE DISABLE

output

ENABLE input

VREF input

ERROR AMP IN

input

ERROR AMP OUT

output

OUTPUT A power

output

OUTPUT B power

output

SENSE AMP IN

A/B signal input

SENSE AMP OUT

signal output

AMPOUT output

AMP+ input

AMP- input

Description

This is the Power Supply input.

Input for the VCC supply monitor. The Threshold can be externally set via a voltage divider.

TTL compatible signal indicating the VCC supply has dropped below the POWER FAIL

THRESHOLD.

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.

This pin allows for the application of filter circuitry in order to avoid false triggering.

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.

Used to set the voltage applied to the VCM during an Automatic Parking Operation.

Logic signal asserted low, activates parking.

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.

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.

Becomes asserted a few microseconds prior to the assertion of POWER ON RESET.

Internal 30k Pullup to LSS.

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.

The reference voltage input is basically that voltage, at which the output current is zero.

Inverting input of error amplifier. The non inverting one is internally tied to Vref.

Open collector output.

Error amplifier output pin.

Voice Coil power output.

Voice Coil power output.

Sense amplifier input pins. The sense resistor is connected across these pins.

Output pin of sense amplifier.

Output of an internal op-amp for general application.

General purpose op-amp non inverting input.

General purpose op-amp inverting input.

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