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STMicroelectronics Electronic Components Datasheet

L6246 Datasheet

12V VOICE COIL MOTOR DRIVER

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L6246 pdf
L6246
12V VOICE COIL MOTOR DRIVER
12V (±10%) OPERATION
3A MAXIMUM CURRENT CAPABILITY
0.3MAXIMUM 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
MULTIPOWER BCD TECHNOLOGY
PQFP44 (10x10)
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(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
1/12


STMicroelectronics Electronic Components Datasheet

L6246 Datasheet

12V VOICE COIL MOTOR DRIVER

No Preview Available !

L6246 pdf
L6246
PIN CONNECTION (Top view)
N.C.
FILTER_CAP
BRAKE DELAY
-THERMAL SD
SENSE-IN+
SENSE-IN-
GND
ERR-OUT
ERR-
SENSE-OUT
N.C.
44 43 42 41 40 39 38 37 36 35 34
1 33
2 32
3 31
4 30
5 29
6 28
7 27
8 26
9 25
10 24
11 23
12 13 14 15 16 17 18 19 20 21 22
N.C.
ENABLE
-SPINDLE START
VCM PARK
-W_GATE
RPARK
VBEMF
+12SETPT
+5SETPT
+5V REF_GND
N.C.
D95IN241B
BLOCK DIAGRAM
CP_GND
C1
C2
VCP
CHARGE
PUMP
GATE DRIVE
-SPINDLE MOTOR
-AE
START START -W_GATE W_GATE
VCM
PARK
INPUT
AMPLIFIER
GATE
DRIVER
VCC
+12
FILTER CAP
VDD
+5
FILTER CAP
+5
+
-
REF1
-
+
4µA
10K
30K
25K
10K
+
-
10K 20K
T_CAP
RPARK
ERR_OUT
VCC/2
ERR-
REF1
ERROR
+ AMPL.
-
PARKING
VPARK
+5V REF
+5V REF_GND
REF1
REF. VOLT.
GENERATOR
VCC/2 SENSE
_IN+
SENSE
_IN-
VCC/2
+
-
SENSE
+ AMPLIFIER
-
SENSE_ VBEMF
OUT
THERMAL
BRAKE
CIRCUIT
POWER AMPLIFIERS
+
-
+
-
D95IN242B
2/12
VIN-
VIN+
VIN_OUT
-POR
-THERMAL SD
BRAKE DELAY
VCC
OUT+
GND
VCC
OUT-
GND


Part Number L6246
Description 12V VOICE COIL MOTOR DRIVER
Maker STMicroelectronics
Total Page 12 Pages
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