L6242 ,VOICE COIL MOTOR DRIVERL6242VOICE COIL MOTOR DRIVERADVANCE DATAOUTPUT CURRENT UP TO 1AOPERATES AT LOW VOLTAGES WITH LOWCOI ..
L6242 ,VOICE COIL MOTOR DRIVERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage 28 VSV Input Voltage VS ViV Dif ..
L6243 ,VOICE COIL MOTOR DRIVERELECTRICAL CHARACTERISTICS (V = 12V, T =25°C; unless otherwise specified)S ambSymbol Parameter Test ..
L6243D ,VOICE COIL MOTOR DRIVERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage 18 VSV Input Voltage 0.3V to VI ..
L6243DS ,VOICE COIL MOTOR DRIVERFUNCTIONAL DESCRIPTION BLOCK DESCRIPTIONThe VCM Driver is controlled via two control sig- OUTPUT ST ..
L6246ES4 ,12V VOICE COIL MOTOR DRIVERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Maximum supply voltage 15 Vpow. max.V Maximum ..
LC32464M-80 ,256K (65536 words X 4 bits) DRAM Fast Page ModeFeatures. 65536 words K 4 bits configuration.. RAS access time/cycle time/power dissipation256 K (6 ..
LC32464P-80 ,256K (65536 words x 4 bit) DRAM fast page modeBlock DiagramR A S o---- Clock generator No,1 ___-__- (w --C) v C CCAS Cy- 9., Clock generalorNo. 2 ..
LC331632M-12 ,512K (32768 words X 16 bits) Pseudo-SRAMPin AssignmentLC331632M-70/80l10/12Vcc GNDT TColumnaddressbuffer (7)Row addrebuffer (8)Column decod ..
LC331632M-70 ,512K (32768 words X 16 bits) Pseudo-SRAMPin AssignmentLC331632M-70/80l10/12Vcc GNDT TColumnaddressbuffer (7)Row addrebuffer (8)Column decod ..
LC338128M-70 ,1 MEG (131072 words x 8 bit) pseudo-SRAMFeatures. 131072 words x 8 bits configuration. CE access time, COE access time, cycle time, operati ..
LC338128M-80 ,1 MEG (131072 words x 8 bit) pseudo-SRAMPin AssignmentAuA1:A7A5"A:"A2Al"1/0:1/021/0:END 1DIP32, SOP32VccA15Ax:1/051/07TADSvns1/04Top viewAu ..
L6242
VOICE COIL MOTOR DRIVER
L6242VOICE COIL MOTOR DRIVER
ADVANCE DATAOUTPUT CURRENT UP TO 1A
OPERATES AT LOW VOLTAGES WITH LOW
COIL RESISTANCE OF THE MOTOR
LARGE COMMON MODE AND DIFFEREN-
TIAL MODE RANGE
LOW INPUT OFFSET VOLTAGE
THERMAL SHUT-DOWN
ENABLE FUNCTION
INTERNAL CLAMP DIODES
DESCRIPTIONThe L6242isa monolithic integrated circuitin SO-20
package intendedfor useasa dual power opera-
tional amplifier.Itis particularly indicatedfor driv-
ing inductive loadsas linear motor, and finds ap-
plicationin Hard Disc, Compact-Disc, etc.
The two power operational amplifiers are control-
ledbya common enable input.
The high gain and output power capability provide
superior performance whatevera power booster required.
PIN CONNECTION AND BLOCK DIAGRAM
SO20
ORDERING NUMBER: L6242
APPLICATION INFORMATIONSFigure1 shows the L6242 configuratedasa tran-
sconductance amplifier,in orderto drive linear
motorsas Voice Coil (VCM). The L6242 provides
the power sectionof the Transconductance Am-
plifier. The two OP AMP are configurated oneas
inverting and the otheras noninverting amplifier,
with the same gain. Workingin push-pull, they
can be configuratedasa bridge. The motor cur-
rent can be controlledby meansof the sense re-
sistor (typical 1Ω)in series with the motor. The
plifier. R1 closes the control loop. R2 converts the
input voltage signal, intoa current signal.
The snubber network provides the system stabil-
ity, always required by the application. The net-
workis directly connectedto the output pinsof
the IC, OUT1 and OUT2, andin parallel with the
load. R4 and C2 couldbeof different values, de-
pending on the p.c.b. configuration and on the
motor characteristics.
The DC transfer function maybe expressedas:= Iout/Vin=k• (R1/R2)
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit Supply Voltage 28 V Input Voltage VS V Differential Input Voltage ±VS V DC Output Current 1 A Peak Output Current (non repetitive) 1.5 A
Ptot Maximum Power Dissipationat Tamb =85°C
TCASE =75°C
Tstg,TJ Storage and Junction Temperature Range -40to 150 °C
ELECTRICAL CHARACTERISTICS (VS= 12V,TJ =25°C unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit Supply Voltage 4 28 V Quiescent DrainCurrent VO =VS/2 10 15 mA Input Bias Current 0.2 1 μA
VOS Input Offset Voltage 15 mV
IOS Input Offset Current 10 50 nA Slew Rate 1.5 V/μs Input Resistance 500 KΩ Open Loop Voltage Gain f= 100Hz 70 80 dB
CMR Common Mode Rejection f= 100Hz 66 84 dB
SVR Supply Voltage Rejection f= 100HzRg= 10KΩ= 0.5V dB
Vdrop High Drop Voltage I= 100mA= 500mA
0.7 1.5
Vdrop Low Drop Voltage I= 100mA= 500mA
0.6 1
Tsd Thermal Shutdown Junction Temperature 145 °C Internal Pull-up Resistorofthe Enable Input 50 KΩ Enable Low Voltage TJ= 130°C -0.3 1.2 V
Ieq Quiescent DrainCurrent En=L 2 5 mA Enable Delay 50 μs
Iol Output Leakage Current 10 μA
L6242
OPTIMIZING LAYOUTOptimizinga PC board layout involvesto observe
the following rules whichin general can avoid ap-
plication problems associated with ground loops
and anomalous recirculation currents. The elec-
trolytic capacitor for the power supply must be
keptas closeto theICas possible.Itis important
that power grounds are closeto each other ona
wide enough. Copper side also,itis importantto
separate on the board the logic ground and the
power groundin sucha way that the ground
traces for the logic signals and referencesdo not
cross the ground traces for the power signals.
Logic ground and power ground must meetat
one pointon the board (startpoint grounding) far
enough away from where the power ground
traces terminateto ground (sense resistors and
recirculation diodes). Thisisto avoid anomalous
interface with the logic signals.Itis generallya
good ideato connecta non inductive capacitor
(typically 100nF) between the pins VS and GND. other casesit may be necessaryto also place by-pass capacitor between the pins Vref and
GND.
Figure1: Voice Coil Motor Control Circuit
L6242
SO20 PACKAGE MECHANICAL DATA
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX. 2.65 0.104 0.1 0.3 0.004 0.012 2.45 0.096 0.35 0.49 0.014 0.019 0.23 0.32 0.009 0.013 0.5 0.020 45 (typ.) 12.6 13.0 0.496 0.512 10 10.65 0.394 0.419 1.27 0.050 11.43 0.450 7.4 7.6 0.291 0.299 0.5 1.27 0.020 0.050 0.75 0.030 8 (max.)
L6242
Information furnishedis believedtobe accurate and reliable. However, SGS-THOMSON Microelectronics assumesno responsibilityforthe
consequencesof useof such informationnorforany infringement ofpatentsor otherrightsof third parties which may resultfrom itsuse.No
licenseis grantedby implicationor otherwise under any patentor patent rightsof SGS-THOMSON Microelectronics. Specifications men-
tionedinthis publicationare subjectto change without notice. This publication supersedes and replacesall informationpreviously supplied.
SGS-THOMSON Microelectronics productsarenot authorizedforuseas critical componentsinlife support devicesor systems withoutex-
presswrittenapprovalof SGS-THOMSON Microelectronics. 1994 SGS-THOMSON Microelectronics-All RightsReserved
SGS-THOMSON Microelectronics GROUPOF COMPANIES
L6242
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