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PDF L6238 Data sheet ( Hoja de datos )
| Número de pieza | L6238 | |
| Descripción | SENSORLESS SPINDLE MOTOR CONTROLLER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L6238 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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L6238
SENSORLESS SPINDLE MOTOR CONTROLLER
PRODUCT PREVIEW
2.5A, THREE-PHASE OUTPUT DRIVE
PRECISION DIGITAL PLL
FULLY-INTEGRATED ALIGN + GO
START-UP ALGORITHM
DIGITAL BEMF PROCESSING
MASTER/SLAVE SYNCHRONIZATION
BIDIRECTIONAL SERIAL PORT
STAND ALONE OR EXT. DRIVER
SHOOT-THROUGH PROTECTION
PLCC44
ORDERING NUMBER: L6238
DESCRIPTION
The L6238 is a complete Three-Phase, D.C.
Brushless Spindle Motor Driver system. The de-
vice features both the Power and Control Sec-
tions and will operate Stand Alone, or can be
used in Higher Power Applications with the addi-
tion of an external Linear Driver.
Start-Up can be achieved with the Fully-Inte-
grated Align + GO Algorithm or may be se-
quenced manually for User-Defined start-up algo-
BLOCK DIAGRAM
rithms.
A Digital PLL provides high accuracy and the ca-
pability to do Master/Slave Synchronization for
Disk Array configurations.
Programmable functions include commutation
Timing Adjustment and Slew Rate Control for
peak efficiency and minimum noise.
Protective features include Stuck Rotor\Backward
Rotation Detection and Automatic Thermal Shut-
down.
June 1993
1/35
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1 page  
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
Parameter
Test Condition
LOGIC SECTION
VinH
VinL
IinH
IinL
VoutL
VoutH
Input Voltage
Input Current
Output Voltage
Vsink = 2mA
Vsource = 2mA
Fsys System Clock Frequency
ton Clock ON Time
toff Clock OFF Time
SEQUENCE INCREMENT
tseq Time Between Rising Edges
SERIAL PORT TIMING Note: Cload(data I/O) = 50pF;
Fshift Clock Frequency
tos Operating Set-up Time
tsettle
tstrobe
twait
Enabling Settling Time
Strobe Pulse Width
Disable Wait Time
tds Data Setup Time
tdh Data Hold Time
tsd Strobe to Data Prop. Delay (*)
tcd Clock to Data Prop. Delay
(*)
tsd Data I/O Activation Delay
(*)
ttsd Data I/O Tri State Delay
twrs Write to Read Set-up Time
tscr Strobe to Clock Time
(Read Mode)
tcsw Clock to Strobe Time
(Write Mode)
PHASE LOCK LOOP SECTION
Tp hse
Static Phase Error
BRAKE DELAY SECTION
Vchrg
Capacitor Charge Voltage
RT = 50K
Iout3 Source Current
VThres
Delay Timer Low Trip Threshold
CHARGE PUMP
Vout9
Storage Capacitor Output
Voltage
Vleak
Blocking Diode Leakage Current
Fcp Charge Pump Frequency
(*) These parameters are a function of Cload.
L6238
Min. Typ. Max. Unit
TBD
–1
4.5
8
20
20
TBD
1
0.5
12
V
V
µA
mA
V
V
MHz
ns
ns
1 µs
2 TBD MHz
50 ns
50 ns
40 ns
40 ns
100 ns
10 ns
100 ns
100 ns
100 ns
80 ns
50 ns
50 ns
50 ns
20 µs
TBD 9.5 TBD
V
0.5 mA
TBD 1.8 TBD
V
20 V
10 µA
300 KHz
5/35
5 Page 
L6238
2.4 Stuck Rotor/Monotonicity
Refer to figure 7. In order to alert the microproc-
essor of fault conditions, two bits are available in
the Serial Port’s Status Register.
1. Stuck Rotor
If the controller enters the Go mode after the Dou-
ble Align, Bemf must be detected within 419ms
when using a system clock frequency of 10MHz.
If this condition is not met, the outputs will be tris-
tated and set this bit to a zero. The controller en-
ters the ”Stuck Rotor Hold” state.
Figure 7: Stuck Rotor/Monotonicity.
OutEna = 1
&
RunBrk = 1
Stuck
Rotor
(hold)
Run
Figure 8: Ext. Sequence.
2. Mono
When the motor spins up normally, the resultant
S P IN SENSE pulses rise in frequency in a
monotonic pattern. Any fault condition that would
cause a rapid decrease in the SPIN SENSE fre-
quency would be detected by internal counters
setting the MONO bit low and forcing a Brake
condition
2.5 External Sequencing
Although the user-defined Start-Up Algorithm is
flexible and will consistently spin up a motor with
minimum external interaction, the possibility ex-
ists where certain applications might require com-
plete microprocessor control of start-up.
The L6238 offers this capability via the SE-
QUENCE INCREMENT input. Referring to figure
9, with Output Enable and Run/Brake low, the
controller is in the ”Hold and Wait for Decision”
state. If the SEQUENCE INCREMENT pin is
brought high during this state, the Auto StartUp
Algorithm is disabled and the sequencer can be
controlled externally.
When Output Enable and Run/Brake are
brought high, the sequencer is incremented every
time that the SEQUENCER INCREMENT pin is
first brought low and then high. During the time
that this pin is high, all Bemf information is
RunBrk = 0
OutEna = 0
SeqInc = X
Auto Start-up
Enabled
D i sab l e d
B r ake
W/Mask
Power
on
Reset
OutEna = 0
&
RunBrk = 0
Hold & wait
for decision
ROuuntBErnka==10
Ho l d
for
”Resync”
Acti on across
line increments
sequencer
RunBrk = 1
OutEna = 0
T r i - st a te
W/Mask
RunBrk = 1
OutEna = 1
Run
W/Mask
SeqInc = 0
SeqInc = 1
SeqInc = 0
SeqInc = 1
T r i - sta t e
W / M ask
RunBrk = 1
OutEna = 0
Run
Wo/Mask
RunBrk = 1
OutEna = 1
Hold for
”Align & Go”
OutEna = 1
&
RunBrk = 0
11/35
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet L6238.PDF ] | |
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