L6243 STMicroelectronics, L6243 Datasheet - Page 6

• Manufacturer Part Number: L6243
• Description: MOSFET & Power Driver ICs DISC BY STM 2/01 PLCC44 VOICE COIL DR
• Manufacturer: STMicroelectronics

Specifications of L6243

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L6243-L6243D
FUNCTIONAL DESCRIPTION (continued)
6/12
PROGRAMMABLE
ERROR AMP OUT
OUTPUT B power
SENSE AMP OUT
AMPOUT
OUTPUT A power
V
PARK VOLTAGE
WRITE DISABLE
A/B
LOGIC SUPPLY
5V FILTER input
ERROR AMP IN
ENABLE
SENSE AMP IN
RESET DELAY
PARK POWER
CC
PARK
RESET output
POWER FAIL
SENSE input
signal output
POWER ON
POWER ON
AMP+ input
AMP- input
V
V
Function
THRESH
SENSE OUT
REF
CC
Output
output
output
output
output
signal input
input
input
input
input
input
input
input
output
input
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.
This is the Power Supply input.
Input for the V
TTL compatible signal indicating the V
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.
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 V
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 V
Open collector output.
General purpose op-amp non inverting input.
General purpose op-amp inverting input.
Once the delay has timed out, the POWER ON RESET will be removed to allow the
CC
supply monitor. The Threshold can be externally set via a voltage divider.
CC
supply has dropped below the POWER FAIL
Description
ref
.
IN