L6246ES4 ,12V VOICE COIL MOTOR DRIVERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Maximum supply voltage 15 Vpow. max.V Maximum ..
L6254 BLOCK DIAGRAMCHARGE FREQUENCY SPINDLE SEQUENCERCS A OUT_APUMP LOCK LOOPCTAPBEMF B OUT_BPROCESSINGST ..
L6258 ,PWM CONTROLLEDL6258®PWM CONTROLLED - HIGH CURRENTDMOS UNIVERSAL MOTOR DRIVERABLE TO DRIVE BOTH WINDINGS OF A BI-P ..
L6258 ,PWM CONTROLLEDABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitVs Supply Voltage 36 VVCC Logic Supply Voltage 7 ..
L6258E ,PWM CONTROLLEDL6258EPWM CONTROLLED - HIGH CURRENTDMOS UNIVERSAL MOTOR DRIVER■ ABLE TO DRIVE BOTH WINDINGS OF A BI ..
L6258E ,PWM CONTROLLEDABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage 45 VsV Logic Supply Voltage 7 V ..
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 ..
LC33832M-10 ,256K (32768word x 8bit) Pseudo-SRAMFeatures3133-DIP28• 32768 words · 8 bits configuration• Single 5 V ±10% power supply[LC33832S, SL]• ..
LC33832M-70 ,256K (32768word x 8bit) Pseudo-SRAMOrdering number : EN4430CCMOS LSILC33832P, S, M, PL, SL, ML-70/80/10256 K (32768 words · 8 bits) Ps ..
L6246ES4
12V VOICE COIL MOTOR DRIVER
L624612V VOICE COIL MOTOR DRIVER
12V (±10%) OPERATION
3A MAXIMUM CURRENT CAPABILITY
0.3Ω MAXIMUM ON RESISTANCE OF EACH
POWER DMOS AT A JUNCTION TEM-
PERATAURE OF 25°C
CLASS AB POWER AMPLIFIERS
LOGIC AND POWER SUPPLY MONITOR
POWER ON RESET
PARKING FUNCTION WITH SELECTABLE
RETRACT VOLTAGE AND DYNAMIC BRAKE
BEFORE PARKING
ENABLE FUNCTION
GATE DRIVER FOR EXTERNAL BLOCKING
N-MOSFET
OVERTEMPERATURE PROTECTION
OVERTEMPERATURE WARNING OUTPUT
PQFP44 PACKAGE
DESCRIPTIONThe voice coil driver L6246 is a linear power am-
plifier designed to drive single phase bipolar DC
motors for hard disk drive applications. The de-
vice contains a selectable transconductance loop,
which allows high precision for head positioning.
The power stage is composed of 2 power amplifi-
ers, in AB class, with 4 DMOSs, with Rdson of
0.5Ω (Sink+Source) maximum, in a H-bridge con-
figuration. Drive voltage for the upper DMOS
FETs is provided by a charge pump circuit to en-
sure low Rdson.
Automatic brake and parking of the head actuator
is performed by logic or when a failure condition
is detected by power supply monitors. An external
resistor programs the parking voltage that en-
ables the head retract. In addition, a 5V stable
output is provided for the external usage, and a
gate driver circuit enables an external power sup-
ply isolation N-MOSFET.
This device is built in BCD II technology allowing
dense digital circuitry to be combined with high
power bipolar power devices and is assembled in
PQFP44.
BLOCK DIAGRAM
PIN CONNECTION (Top view)
L62462/12
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA(*) Standard board construction: single layer (1S 0P); size 100mm long by 100mm wide.
(**) The board construction includes: a 6 layer board (2S 4P, with power planes ≅80%); size 136mm long by 99mm wide; package location
near middle point of lenght and one third of width.
PIN FUNCTIONS
L62463/12
ELECTRICAL CHARACTERISTICS (Tj = 25°C, Vdd = 5V, Vcc = 12V; unless otherwise specified.)
PIN FUNCTIONS (continued)
L62464/12
ELECTRICAL CHARACTERISTICS (continued)
L62465/12
BLOCK DESCRIPTIONPOWER AMPLIFIERS
The two power amplifiers are connected in bridge
configuration working in AB class.
SENSE AMPLIFIER
This stage senses the voltage drop across the
Rsense.
The input stage is supplied by the charge pump
voltage to have an high dynamic, while the other
sections of the amplifier are supplied by the volt-
age of 10.5V internally regulated to have an high
power supply rejection (this voltage, supplies also
the error amplifier, the input amplifier and the op-
erational amplifier which generates the Vcc/2 volt-
age).
The open loop gain is around 80dB and the band-
with is more than 1MHz.
The voltage gain is fixed internally at 10 V/V.
ERROR AMPLIFIER
This is the stage which compares the input volt-
age and the sense voltage, generating the control
voltage for the power section.
The open loop gain and bandwith of this amplifier
are similar to the sense amplifier.
The negative input and the output of the error am-
plifier are accessible externally in order to have
the current loop compensation user configurable.
The dynamic of the output is limited at +/- 2Vbe to
have a faster response of the output voltage.
INPUT AMPLIFIER
The inputs and the output pins are externally ac-
cessible to have the possibility to configure the
transconductance gain of the current control loop
selecting the voltage gain of this amplifier.
The open loop gain and bandwith of this amplifier
are similar to the sense amplifier.
REFERENCE VOLTAGE GENERATOR
This block generates the two reference voltage
Vcc/2 and +5VREF.The Vcc/2 voltage is used as reference by the
current control loop.
The +5VREF is a very stable voltage generator
that can be used as reference voltage of an exter-
nal DAC.
ELECTRICAL CHARACTERISTICS (continued)
RETRACT TRUTH TABLE
L62466/12
