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PDF L6243DS Data sheet ( Hoja de datos )
| Número de pieza | L6243DS | |
| Descripción | VOICE COIL MOTOR DRIVER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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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
BLOCK DIAGRAM
SO24
ORDERING NUMBER: L6243DS
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.
OUT A
SNUBBER
VOICE COIL
Rsense
OUT B
SENSE IN B SENSE IN A
VIN
R1
R2
Cf
Rf
SENSE OUT ERROR IN
ERROR OUT
GND
VDD A
VDD B
PARK POWER
PARK VOLTAGE
PROGRAM
POWER FAIL
THRESHOLD
(12V)
LOGIC
SUPPLY
SENSE
LOGIC SUPPLY FILTER
BRIDGE
POWER
STAGE
-
+
PARK
VOLTAGE
GENERATOR
-
+
+
-
VCC
INTERNAL
VOLTAGE
REFERENCE
-
+
VCC SENSE OUT POR DELAY
POR
-
+
VREF
THERMAL
PROTECTION
PARK
ENABLE
FALL TIME
DELAY
D96IN469
February 1998
1/8
1 page  
L6243DS
FUNCTIONAL DESCRIPTION (continued)
Function
Description
VDD input
POWER FAIL
THRESH
This is the Power Supply input.
Input for the VCC supply monitor. The Threshold can be externally set via a voltage divider.
VCC SENSE OUT TTL compatible signal indicating the VCC supply has dropped below the POWER FAIL
Output
THRESHOLD.
LOGIC SUPPLY This pin allows the monitoring of 5V supply. When a low voltage is detected POR is asserted
SENSE input
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 Used to set the voltage applied to the VCM during an Automatic Parking Operation.
PARK VOLTAGE
input
PARK input Logic signal asserted low, activates parking.
POWER ON RE- Indicates an error condition to the external control and support circuitry. A Logic Supply Fail
SET output
condition automatically initiates a POWER ON RESET. Internal 30k Pullup to LSS.
POWER ON RE-
SET DELAY in-
put
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.
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
ERROR AMP IN
input
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.
ERROR AMP OUT Error amplifier output pin. Open collector output.
output
OUTPUT A power Voice Coil power output.
output
OUTPUT B power Voice Coil power output.
output
SENSE AMP IN Sense amplifier input pins. The sense resistor is connected across these pins.
A/B signal input
SENSE AMP OUT Output pin of sense amplifier.
signal output
LOGIC SUPPLY Capacitor connection to avoid false triggering
FILTER
IC with a programmable threshold, which is set
by an external resistive divider. The TTL compat-
ible output can be used separately or connected
to Park input in order to park the head.
voltage is set by connecting an external resistor
between Park Voltage Program input and
ground: (Vpark=Rext x Iref, Iref=100µA typ). Con-
necting ENABLE input to GND the driver will be
disabled (outputs in high impedance mode).
PARKING CIRCUIT OPERATIONT
The voice coil driver is switched into the parking
condition when Power on Reset output or Park in-
put are low. In such a condition a fixed voltage is
superimposed on the load and the value of such a
THERMAL SHUTDOWN
It will disable the IC when the junction tempera-
ture exceeds the threshold value above which the
device could be damaged.
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L6243DS.PDF ] | |
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