L6287
POWER COMBO DRIVER
DESCRIPTION
The F-VHS Motor Driver COMBO IC includes a
double three phase brushless motor driver plus a
DC full bridge motor driver for VCR application.
The package is SDIP42 (38+2+2 pin ground
frame).
The device is realized in BCD technology with
power LDMOS output stages.
The gate drive for high side stages is provided by
an internal charge pump with two external capaci-
tors. The first three phase motor driver is devoted
to the DRUM motor control.
The phase sequence update signal is provided in-
itially by an external start-up signal (FSTART),
whose frequency is internally divided by four,
while, during normal operation, is provided by an
optical tacho converter signal.
This signal is used as clock and reset for the state
machine.
The regulation of the speed is externally provided
by means of PWM signal generated by the
P
(DPWM), without external sensing resistor. The
feedback to the
P unit is given by a suitable
open drain output signal (PUD) synchronized by
the internal state machine.
The second three phase motor driver is devoted
to the CAPSTAN control. While the DRUM will al-
ways spin in a fixed direction, the CAPSTAN mo-
tor needs a more sophisticated logic to control the
changes in spin direction.
The motor position detection is carried out by
means of three comparators for Hall effect sen-
sors. The loop regulation for this motor is still pro-
vided by the
P with the signals CPWM and
CDIR.
The LOADING motor section include a full bridge
DC motor driver. The motor operations are di-
rectly set by the inputs LPWM, LDIR according to
the truth table reported on the page 5.
The device also includes a circuit for early ther-
mal alarm, last thermal alarm and thermal shut-
down with hysteresys. The output of this stage is
an open drain, kept ON during normal operations.
The THERM signal follows the inverted FSTART
signal between early warning and last warning
temperature, while remains in high impedance
(OFF) after lastwarning temperature and during
thermal shutdown.
The STANDBY state of the device is imposed by
THERMAL SHUTDOWN
UNDERVOLTAGE ON VCC SUPPLY
EXTERNAL SIGNAL FSTART;
This state is imposed automatically after a de-
fined time-out.
The time-out is realized by sensing the falling
edges of the FSTART signal: if no edges are re-
corded for a time interval greater than a certain
time constant, the STANDBY condition is gener-
ated.
The time constant is defined by the external ca-
pacitor CTO.
In the STANDBY state the main functions (upper
power stages, opto decoder, etc) of the device
are turned off in order to minimize the power con-
sumption.
The device also implement a HEATER function.
The HEATER transistor is OFF during thermal
shutdown, undervoltage condition and during nor-
mal working mode.
The HEATER transistor is driven ON when the
external STANDBY condition is present according
to the following table:
FSTART
HIGH
LOW
HEATER
OFF
ON
During the ON condition, the specified heater Ron
is not guaranteed if all the voltage supplies are
not at their minimum nominal value.
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice
.
February 1997
ORDERING NUMBER: L6287
SDIP42
1/9
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
DD
Drum Supply Voltage
20
V (**)
V
DC
Capstan Supply Voltage
20
V (**)
V
DL
Loading Supply Voltage
20
V (**)
UPPER POWER
V
DS MAX
Motor Output to Ground Voltage
20
V(***)
LOWERPOWER
V
DS MAX
Motor Output to Supply Voltage
20
V (***)
V
CC
Logic Supply Voltage
7
V
V
S
Special Supply Voltage
7
V
I
p1
Loading Motor Peak Current (T
on
= 1
s Duty Cycle = 2%)
1.6
A
I
pd
Drum Motor Peak Current (T
on
= 1
s Duty Cycle = 2%)
1.4
A
I
pc
Capstan Motor Peak Current (T
on
= 1
s Duty Cycle = 2%)
1.8
A
V
il
Logic Input Low State Voltage
-0.1
V
V
ih
Logic Input High StateVoltage
7
V
V
therm
Open Drain Maximum Voltage
7
V
V
heat
Open Drain Maximum Voltage
20
V (**)
(**)
Not operative - STANDBY condition
(***) Each motor driver
PINS CONNECTION
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-amb
Thermal Resistance Junction to Ambient
48
C/W
R
th j-pins
Thermal Resistance Junction to Pin
15
C/W
Note: Batwing pin.
L6287
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BLOCK DIAGRAM
CP1 = 0.01
F
CP2 = 0.1
F
L6287
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PIN DESCRIPTION
VOLTAGE SUPPLIES (The power supply voltage V
DD
, V
DC
, V
DL
must be connected toghether externally)
V
DD
Power supply voltage for drump motor
V
DC
Power supply voltage for capstan motor
V
DL
Power supply voltage for loading motor and charge pump
V
CC
Logic voltage supply
L
GND
Logic Ground
GND R
Capstan + drum power ground
GND L
Loading + Charge pump Power ground
V
S
Analog voltage supply
S
GND
Analog ground
Note: The V
CC
and V
S
Power Supply must be together either at maximum or minimum value.
DRUM MOTOR
D
OUT U
Winding Output U
D
OUT V
Winding Output V
D
OUT W
Winding Output W
D
PWM
PWM logic pulse input. Control signal generated by
P for dump motor current regulation.
P
UD
Logic output position feedback generated by the translator logic
OD
Optocoupler diode output
OC
External capacitor for tacho-converter integrator
OT
Input for optocoupler transistor
OR
Tacho-converter external resistor. This resistor defines the full-light current level of the tacho.
CAPSTAN MOTOR
C
OUT U
Winding Output U
C
OUT V
Winding Output V
C
OUT W
Winding Output W
C
PWM
PWM logic pulse input. Control signal generated by
P for current regulation.
C
DIR
Motor Direction Logic Input Signal
H1+
Hall sensor differential input
H1-
H2+
Hall sensor differential input
H2-
H3+
Hall sensor differential input
H3-
LOADING MOTOR
L
OUT A
Winding Output A
L
OUT B
Winding Output B
L
PWM
PWM logic input.
L
DIR
Direction logic input
SERVICES
HEATER
Open drain output for heater resistor
V
CP
Charge pump storage capacitor pin
CP1
Bootstrap Capacitor pin
CP2
Bootstrap Capacitor pin
THERM
Open drain thermal alarm output
F
START
Start-up logic signal for drum motor
CTO
Time out capacitor output
L6287
4/9
ELECTRICAL CHARACTERISTICS (Tj = 0 to125
C; V
CC
= V
S
= 5V
5%; V
DC
= V
DL
= V
DD
= 10 to 18V;
unless otherwise specified.)
POWER SUPPLY
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
(#)V
DD
Drum Power Supply Voltage
10
18
V
(#)V
DC
Capstan Power Supply Voltage
10
18
V
(#)V
DL
Loading Power Supply Voltage
10
18
V
V
CC
Logic Power Supply Voltage
4.5
5.5
V
V
S
Sensor Power Supply Voltage
4.75
5.25
V
V
CCth
Undervoltage Threshold
3.6
4.4
V
# WARNING
The functionality of the I.C. is guaranted in this voltage range. Nevertheless the specified operating voltages (V
DC
, V
DD
, V
DL
), must be selected
according to the load characteristics. Proper cautions must be taken in the application in order to assure that the drain-source voltage across
each output power transistor does not exceed 20V max.
LOADING MOTOR
ACTIVATION TRUTH TABLE
INPUT
OUTPUT
LPWM
LDIR
LOUTA
LOUTB
0
0
LOW
LOW
0
1
LOW
LOW
1
0
HIGH
LOW
1
1
LOW
HIGH
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
R
DSH
High Side R
DSonH
2
R
DSL
Low Side RDSonL
2
(*)I
OL
DC Output Current
800
mA
(*)I
pl
Peak Output Current
DUTY CYCLE = 10%;
t
ON
= 500ms
1
A
DRUM MOTOR
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
I
cd
DC Output Current
400
mA
(*)I
cdp
Peak Output Current
600
mA
(*)I
pdb
Peak Output Current
DUTY CYCLE = 10%;
t
ON
= 500ms
800
mA
R
DSH
High Side RDSonH
1.6
R
DSL
Low Side RDSonL
1.6
CAPSTAN MOTOR
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
I
co
DC Output Current
800
mA
(*)I
cop
Peak Output Current
1
A
(*)I
pob
Peak Output Current
DUTY CYCLE = 10%;
t
ON
= 1ms
1.5
A
R
DSH
High Side RDSonH
1
R
DSL
Low Side RDSonL
1
(*) WARNING
These current values are compatible with the structure of the IC power structure. Nevertheless the use of these current levels could produce
junction temperatures that force IC outside of the operative range due to the thermal characteristics of the choosen package.
L6287
5/9
ELECTRICAL CHARACTERISTICS (continued)
DRUM TACHO CONVERTER
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
I
od
Open Loop Output Current
V
od
= 1V; I
oc
= 100
A (Note 1)
30
60
mA
I
ot
Full Light Current Range
0.5
3
mA
I
oc
Sink Current
V
or
= 0; I
od
= 0
0.2
0.5
A
I
ot
vs I
or
Mismatch
5
10
%
V
ref
Opto Resistor Reference
Voltage
V
S
= 4.75V
3.36
3.72
V
V
S
= 5V
3.54
3.91
V
V
S
= 5.25V
3.72
4.11
V
V
OC
Open Loop Opto Capacitor
Voltage
V
OD
= 1V see Fig. 1
V
S
= 4.75V
V
S
= 5V
V
S
= 5.25V
2.75
V
V
thr1
Clock Threshold Voltage
V
S
= 4.75V
2.19
2.42
V
V
S
= 5V
2.30
2.54
V
V
S
= 5.25V
2.42
2.67
V
V
thr2
Reset Threshold Voltage
V
S
= 4.75V
0.30
0.33
V
V
S
= 5V
0.32
0.35
V
V
S
= 5.25V
0.33
0.37
V
t
pud
P Syncro Pulse Duration
1
3
s
I
pud1
Open Drain Sink Current
V
O
= 0.4V
5
mA
Note 1: The suggested C
opt
external capacitor value is 5
F (
5%)
HALL COMPARATOR
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
in
Input Voltage Range
0.5
2.7
V
I
b
Input Bias Current
1
A
V
of
Input Offset Voltage
8
mV
V
hy
Switchable Hysteresys
Vref = 1.5V;
10
40
mV
THERMAL PROTECTION
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
I
therm
Open Drain Sink Current
V
out
= 0.4V (see note 1)
5
mA
T
s
Shutdown Temperature
155
170
185
o
C
T
sdh
Shutdown Hysteresis
60
o
C
T
al1
Early Warning Temperature
Ts -40
o
C
T
al2
Last Warning Temperature
(see note 2)
Ts -20
C
NOTE 1: Therm output stage is on in the normal temperature range
NOTE 2: In the Tal-Tll temperature range therm signal follows the inverted Fstart signal. After Tll temperature this output is always in high
impedance. If thermal shutdown is reached this pin will remain in this state un til the shutdown hysteresys will be recovered.
HEATER
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
R
dsheat
Heater R
DSon
3
ohm
V
heat
Heater Voltage
18
V
L6287
6/9
ELECTRICAL CHARACTERISTICS (continued.)
LOGIC LEVELS FOR DIGITAL INPUTS (C
PWM
, C
DIR
, D
PWM
, F
START
, L
PWM
, L
DIR
)
A pull up resistor R
i
is connected between the C
DIR
, F
START
, L
PWM
, L
DIR
inputs pads; C
PWM
and D
PWM
are left unconnected.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
il
Input Low Voltage
0.8
V
V
ih
Input High Voltage
2
V
R
i
Pull Up Resistor
3.5
10.5
Kohm
TIME OUT STAGE
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
I
cto
Time Out Output Current
(Note 1)
5
20
uA
Note 1: The suggested external capacitor value is C
to
= 1
F (
20% max) for f
START
= 20KHz.
Figure 1: Optocircuit Open Loop OC Voltage.
L6287
7/9
A1
B
e
B1
D
22
21
42
1
LA
e1
A2
c
E1
E
e2
Gage Plane
.015
0,38
e2
e3
E
SDIP42
SDIP42 PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
5.08
0.20
A1
0.51
0.020
A2
3.05
3.81
4.57
0.120
0.150
0.180
B
0.38
0.46
0.56
0.0149
0.0181
0.0220
B1
0.89
1.02
1.14
0.035
0.040
0.045
c
0.23
0.25
0.38
0.0090
0.0098
0.0150
D
36.58
36.83
37.08
1.440
1.450
1.460
E
15.24
16.00
0.60
0.629
E1
12.70
13.72
14.48
0.50
0.540
0.570
e
1.778
0.070
e1
15.24
0.60
e2
18.54
0.730
e3
1.52
0.060
L
2.54
3.30
3.56
0.10
0.130
0.140
L6287
8/9
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as criticalcomponents in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics Printed in Italy All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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L6287
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