SGS Thomson Microelectronics L6243D, L6243 Datasheet

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

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

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

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