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L6246 датащи(PDF) 1 Page - STMicroelectronics

номер детали L6246
подробное описание детали  12V VOICE COIL MOTOR DRIVER
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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L6246
12V VOICE COIL MOTOR DRIVER
12V (
±10%) OPERATION
3A MAXIMUM CURRENT CAPABILITY
0.3
Ω 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
DESCRIPTION
The 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
0.5
Ω (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.
February 1998
PQFP44 (10x10)
MULTIPOWER BCD TECHNOLOGY
1/12


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