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STMicroelectronics Electronic Components Datasheet

L6243DS Datasheet

VOICE COIL MOTOR DRIVER

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L6243DS pdf
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


STMicroelectronics Electronic Components Datasheet

L6243DS Datasheet

VOICE COIL MOTOR DRIVER

No Preview Available !

L6243DS pdf
L6243DS
PIN CONNECTION (Top view)
LOGIC SUPPLY SENSE
VDDA
OUTA
PARK
ENABLE
GND
GND
SENSE IN A
LOGIC SUPPLY FILTER
SENSE IN B
OUT B
PARK POWER
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
D96IN467
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
VIN
VID
IO
Ip
Ptot
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage
DC Output Current
Peak Output Current (non repetitive)
Total Power Dissipation (Tamb = 70°C)
Tstg Storage and Junction Temperature
POR DELAY
VDD SENSE OUT
POWER FAIL THRESHOLD
PARK VOLTAGE PROG
POR
GND
GND
ERROR OUT
ERROR IN
VREF
SENSE OUT
VDD B
Value
14
0.3V to VS
±VS
1
1.2
1.2
-55 to +150
Unit
V
A
A
W
W
°C
PIN FUNCTIONS
Name
VDD
GND
Vref
ENABLE
PARK POWER
CURRENT SENSE OUT
ERROR AMP IN
ERROR AMP OUT
SENSE IN Α/Β
OUT A, B
PARK
PARK VOLTAGE PROGRAM
POWER FAIL THRESHOLD
LOGIC SUPPLY SENSE
POR
POR DELAY
LOGIC SUPPLY FILTER
Function
Power supply.
Common Ground.
Voltage Reference.
Input. Logic low will disable IC.
Input Power supply for the parking circuit.
Current sense operational amplifier output.
Error amplifier inverting input.
Error amplifier output.
Input for external sense resistors.
Outputs of the two Power Operational Amplifiers Connections for Voice coil Motor.
External input for parking. Low will activate the park procedure.
Input to set the park voltage.
Supply monitor threshold setting.
Sense the logic supply level
Power on reset output. Low will signal to the controller the failure of the logic supply.
Capacitor connection to set the power on reset delay.
Capacitor connection to filter the logic supply ripple
2/8


Part Number L6243DS
Description VOICE COIL MOTOR DRIVER
Maker STMicroelectronics
Total Page 8 Pages
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