![](/html/ca/caa9/caa9d40c2907e2f2d9614340e1cd61a082be353c084ff2f5f798f98ab51ccb6c/bg1.png)
12V/5V OPERATION
PARKING FUNCTION FOR HARD DISK
HEAD ACTUATOR
OUTPUT CURRENT UP TO 2A DC, 2.5A
PEAK
LOW SATURATIONVOLTAGE
LOGICAND POWERSUPPLYMONITOR
LINEARCONTROL
THERMALPROTECTION
ENABLEFUNCTION
CURRENT SENSE RESISTOR CONNEC-
TIONS
DESCRIPTION
The L6243/D is a Bipolar IC developed for use in
Hard Disk Head Actuator positioning applications.
The Power Op-Amp Output Bridge, Differential
Amplifier, and Error Amplifier, are controlled 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 to work
L6243
L6243D
VOICE COIL MOTOR DRIVER
PLCC44 SO(24+2+2)
ORDERING NUMBERS:
L6243 L6243D
as a Transconductance Amplifier to drive a
VoiceCoil Motor in LinearMode.
Additional features include Power On Reset Delay, Enable and Park, as well as a general purpose Operational Amplifier. 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 automatic parking sequence during a
power failure. A resistor programmed parking
voltageenablesa constant velocityhead retract.
BLOCK DIAGRAM
July 1996
This is advanced information on a new product now in development or undergoing evaluation.Details are subjectto change without notice.
1/12
![](/html/ca/caa9/caa9d40c2907e2f2d9614340e1cd61a082be353c084ff2f5f798f98ab51ccb6c/bg2.png)
L6243-L6243D
PIN CONNECTION
PLCC-44
ERROR AMP INPUT
ERROR AMP OUTPUT
OP AMP OUTPUT
WRITE DISABLE OUTPUT
POWER ON RESET OUTPUT
PARK VOLTAGE PROGRAM
(Top view)
GND
OP AMP -INPUT
OP AMP +INPUT
GND
GND
7
8
9
10
11
12
13
14
15
16
17
GND
N.C.
N.C.
REF
V
SENSE AMP OUTPUT
123564
(12V)
CC
V
PARK POWER
OOUTPUT B
GND
N.C.
SENSE AMP INPUT B
40414244 43
39
GND
38
SENSE AMP INPUT A
37
N.C.
36
GND
35
N.C.
34
GND
33
N.C.
32
N.C.
31
GND
30
ENABLE INPUT
29
GND
SO24+2+2
POWER ON RESET OUTPUT
V
REF
N.C.
N.C.
N.C.
ERROR AMP INPUT SENSE AMP INPUT B
ERROR OUTPUT
GND
GND
WRITE DISABLE OUTPUT
PARK VOLTAGE PROGRAM
POWER FAIL THRESHOLD
VCCSENSE OUTPUT
POWER ONRESET DELAY
N.C.
POWER FAIL THRESHOLD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SENSE OUTPUT
CC
V
POWER ON REST DELAY
D96IN450
2322211918 20 28272624 25
(12V)
CC
V
LOGIC SUPPLY SENSE (5V)
N.C.
N.C.
5V FILTER
OUTPUT A
PARK INPUT
SENSE AMP OUTPUT
28
V
27
CC
PARK POWER
26
OUTPUT B
25
24
SENSE AMP INPUT A23
GND
22
GND
21
ENABLE
20
PARK INPUT
19
OUTPUT A
18
5V FILTER
17
V
16
CC
LOGIC SUPPLY SENSE (5V)
15
D96IN449
2/12
![](/html/ca/caa9/caa9d40c2907e2f2d9614340e1cd61a082be353c084ff2f5f798f98ab51ccb6c/bg3.png)
L6243-L6243D
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
I
I
P
T
THERMAL DATA
Symbol Description L6243 L6243D Unit
R
th j-pin
R
th j-amb
R
th j-amb
Supply Voltage 18 V
S
Input Voltage 0.3V to V
IN
Differential Input Voltage ±V
ID
DC Output Current 2 A
O
Peak Output Current (non repetitive) 2.5 A
p
Total Power Dissipation (T
tot
=70°C) for L6243
amb
for L6243D
Storage and Junction Temperature -55 to +150 °C
stg
Thermal Resistance Junction to pin
Thermal Resistance Junction to pin floating in air
Thermal Resistance Junction to pin 16 cm
2
copper area on board
12
62
36
S
2
1.2
heat sink
S
14
50
W
W
°C/W
°C/W
C/W
°
PIN FUNCTIONS
Name Function
V
CC
GND Common Ground.
V
ref
ENABLE Input. Logic low will disable IC.
PARK POWER InputPower supply for the parking circuit.
CURRENT SENSE OUT Current sense operational amplifier output.
ERROR AMP IN Erroramplifier inverting input.
ERROR AMP OUT Erroramplifier output.
SENSE IN
±
OUT A, B Outputs of the two Power Operational Amplifiers Connections for Voice coil Motor.
PARK External input for parking. Low will activate the park procedure.
PARK VOLTAGE PROGRAM Inputto set the park voltage.
POWERFAIL THRESHOLD Supplymonitor threshold setting.
LOGIC SUPPLY SENSE Logic Supply Sense.
5V FILTER Capacitor connection to filter the logic supply ripple.
SENSE OUT Power supply failure monitor output.
V
CC
POR Power on reset output. Low will signal to the controller the failure of thelogic supply.
POR DELAY Capacitor connection to set the power on reset delay.
WRITE DISABLE Output for write disable. Low will disable the writing mode.
AMP– Inverting input of the additional op amp.
AMP+ Non-inverting input of the additional op amp.
AMPOUT Output of the additional op amp.
Power supply.
VoltageReference.
Inputfor external sense resistors.
3/12
![](/html/ca/caa9/caa9d40c2907e2f2d9614340e1cd61a082be353c084ff2f5f798f98ab51ccb6c/bg4.png)
L6243-L6243D
ELECTRICALCHARACTERISTICS (VS= 12V, T
=25°C;unless otherwise specified)
amb
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
I
d
T
j
Supply Range 4.5 13.2 V
Quiescent Drain Current 20 mA
Thermal Shutdown Junction
160 °C
Temperature
ERRORAMPLIFIER
I
b
I
OS
V
OS
Gv Large Signal Open Loop Voltage
GBW Gain Bandwidth 3 MHz
G
min
+ Output Source Current 6 mA
I
O
I
O–-
SR Slew-rate 2 V/µs
Input Bias Current 1
Input Offset Current 300 nA
Input Offset Voltage 5 mV
65 dB
Gain
Minimum Voltage Gain 5
Output Sink Current 6 mA
SENSEAMPLIFIER
RIN,V
A
d
SR Slew-rate 1 V/µs
GBW Gain Bandwidth Product 3 MHz
R
in
CMRR Common Mode Rejection Ratio 55 dB
V
ref
ref Input Impedance
9K
Differential Gain 8 V/V
Sense Input Impedance 1.5 KΩ
POWEROP. AMP.
A
µ
Ω
G
V
V
d
V
off
Voltage Gain 26 dB
Total Output Voltage Drop IO= 250mA
I
= 500mA
O
I
=1A
O
I
=2A
O
Offset Voltage on Sense
450
750
1.15
2.30
1.5
2.5
5mV
Resistor
BW Bandwidth on Resistive Load 100 KHz
GENERAL PURPOSEOP-AMP
I
b
I
OS
V
OS
G
V
GBW Gain Bandwidth Product 1 MHz
I
O+
I
O–
SR Slew Rate 1 V/µs
Input Bias Current 1 µA
Input Offset Current 300 nA
Input Offset Voltage 5 mV
Large Signal Open Loop Voltage
65 dB
Gain
Output Source Current 6 mA
Output Sink Current 6 mA
mV
mV
V
V
4/12