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PDF L7250 Data sheet ( Hoja de datos )
| Número de pieza | L7250 | |
| Descripción | 5V & 12V SPINDLE AND VCM MOTORS DRIVER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L7250 (archivo pdf) en la parte inferior de esta página. Total 46 Páginas | ||
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L7250
5V & 12V SPINDLE AND VCM MOTORS DRIVER
PRODUCT PREVIEW
s 12V & 5V (±10%) OPERATION
s REGISTER BASED ARCHITECTURE
s 3 WIRE SERIAL COMMUNICATION
INTERFACE UP TO 33 MHZ
s BCD TECHNOLOGY
Spindle Motor Controller
s INTERNAL POWER DEVICE 0.9 OHM MAX
VALUE @ 125°C (SINK+SOURCE)
s 2.5A PEAK CURRENT CAPABILITY
s ST SMOOTHDRIVE SINUSOIDAL PWM
COMMUTATION
s DEDICATED ADC FOR POWER SUPPLY
VOLTAGE COMPENSATION
s SPINDLE CURRENT LIMITING VIA FIXED
FREQUENCY PWM OF SPINDLE POWER
OUTPUTS AT THE SMOOTHDRIVE PWM
RATE
s SYNCHRONOUS RECTIFICATION DURING
PWM TO REDUCE POWER DISSIPATION
s CURRENT SENSING VIA EXTERNAL
CURRENT SENSE RESISTOR
s INDUCTIVE SENSE POSITION START UP
DRIVEN BY µPROCESSOR
s SPINDLE BRAKING DURING POWER DOWN
CONDITION
Voice Coil Motor Driver with Ramp Load/Unload
s INTERNAL POWER DEVICE 0.9 OHM MAX
VALUE @ 125°C (SINK+SOURCE)
s 2A PEAK CURRENT CAPABILITY
s 15 BIT LINEAR DAC FOR CURRENT
COMMAND, WITH INTERNAL REFERENCE
VOLTAGE
s SENSE AMPLIFIER GAIN SWITCH
s CLASS AB OUTPUT STAGE WITH ZERO
DEAD-BAND AND MINIMAL CROSSOVER
DISTORTION
s RAMP LOAD AND UNLOAD CAPABILITY AS
WELL AS CONSTANT VOLTAGE RETRACT
s EXTERNAL CURRENT SENSE RESISTOR IN
SERIES WITH MOTOR.
s HIGH CMRR (>70DB) AND PSRR (>60DB)
SENSE AMP
s EXTERNAL CURRENT CONTROL LOOP
COMPENSATION
s HIGH BANDWIDTH VCM CURRENT
CONTROL LOOP CAPABILITY
s HIGH PSRR, LOW OFFSET, LOW DRIFT GM
LOOP
TQFP64
ORDERING NUMBER: L7250
s VCM VOLTAGE MODE, CONTROLLED BY
VCM DAC
s GM LOOP OFFSET CALIBRATION SCHEME
INCLUDES A COMPARATOR ON THE
ERROR AMP
Auxiliary Functions
s 3.3V AND 1.8V LINEAR REGULATOR
CONTROLLER
s NEGATIVE VOLTAGE REGULATOR
s INTERNAL ISOFET 0.1 OHM @125C
s POWER MONITOR OF 12V, 5V, 3.3V AND
1.8V
s SHOCK SENSOR CIRCUIT TAKES INPUTS
FROM PIEZO OR CHARGING ELEMENT
s 10 BIT ADC WITH 4 MUXED INPUTS
s THERMAL SENSE CIRCUIT AND OVER
TEMPERATURE SHUT DOWN
s CHARGE PUMP BOOST VOLTAGE
GENERATOR FOR HIGH SIDE GATE DRIVE
s ANALOG PINS AVAILABLE TO ENTER
SIGNALS TO BE CONVERTED BY THE
INTERNAL ADC
DESCRIPTION
L7250 is a power IC for driving the SPINDLE and
VCM motors, suitable for 5V & 12V application. The
spindle system includes integrated power FETs
which are driven using ST's Smoothdrive pseudo-si-
nusoidal commutation technology. The voice coil mo-
tor (VCM) system includes integrated power FETs,
as well as ramp load and unload capability. Linear
3.3V and1.8V voltage regulators are included, as well
as a negative regulator.
Power monitoring of VCC5, VCC12, and of the two
positive voltage regulators is also included.L7250
uses a 3 wire serial interface: S_DATA, S_CLK and
S_ENABLE
July 2001
1/46
This is preliminary information on a new product now in development. Details are subject to change without notice.
1 page  
ELECTRICAL CHARACTERISTCS
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VCV1,VCV2,VCV3,VCV4
VCC5 maximum voltage
OUTU1,OUTU2,OUTV1,OUTV2,OUTW1,OUTW2
VCMP1,VCMP2,VCMN1,VCMN2
VM1,VM2
Digital Input Voltage
Operating free-air temperature
Storage Temperature
L7250
Value
14
6
-1V to 16
-0.3 to VCC5
0 to 70
-55 to 150
Unit
V
V
V
V
°C
°C
ELECTRICAL CHARACTERISTCS
POWER SUPPLY [VCC5 & VCV] VCC5 = 5V ±10%, VCV = 12V ±10%. Tamb = 25°C (unless otherwise specified)
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
POWER MONITOR, SUPPLY CURRENTS, ETC.
Icc5 VCC5 Operating current
Spindle and VCM enabled, no
load
Ivcv VCV + VRET Operating current Spindle and VCM enabled, no
load
CHARGE PUMP VOLTAGE BOOSTER
VBOOS Charge pump output voltage
T
VCV = 12V
Iload = 5mA
VBOOS Switching frequency
Tfreq
POWER MONITOR
vt5 VCC5 threshold
vt12 VCC12 threshold
hv5 VCC5 hysteresis
hv12 VCC12 hysteresis
vt33 V33 Threshold
hv33 V33 Hysteresis
vt18 V18 Threshold (at pin 25_FEED)
hv18 V18Hysteresis
NPORlow NPOR low level output voltage VCV > 4.5V Iol = 5mA
9 mA
44 mA
18.5 V
1 MHz
4.0
9
40
100
2.7
20
1.07
25
4.175
9.5
100
200
2.8
40
1.12
50
0.75
4.35
10
160
300
2.9
60
1.17
75
V
V
mV
mV
V
mV
V
mV
V
5/46
5 Page 
L7250
ELECTRICAL CHARACTERISTCS (continued)
POWER SUPPLY [VCC5 & VCV] VCC5 = 5V ±10%, VCV = 12V ±10%. Tamb = 25°C (unless otherwise specified)
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
SERIAL PORT
Voh Logic Output voltage high
Vol Logic Output voltage low
Vih Logic input high
Vil Logic input low
Iih Logic high input current
Iil Logic low input current
Ioh=1mA
Iol=1mA
Iih=1uA
Iil=-1uA
Internal Pulldown Resistor
Vin = 3.3V
2.7 V
0.5 V
2.2 V
0.5 V
33 µA
-1.00 µA
1 SERIAL PORT
The serial port is a bidirectional three pin interface, using SDATA, SCLK and SEN to address and communicate
with sixteen 8 bit registers in the L7250. These registers include the status register, Spindle control registers,
VCM control registers, sinewave drive registers, and test mode register. These registers are cleared to zero at
power up.
1.1 Default comunication modes setting (bit 7, Reg05H ) = 0
After the SEN falling edge, the internal state machine is waiting for the first SCLK falling edge. This means that
if the SCLK line starts from an high level the first falling edge, respecting the setup time Tefcf, is considered,
and is used to read the R/W bit. During a writing process the internal state machine must see 16 SCLK falling
edges to validate the operation. The write mode is started if the R/W bit is low on the first falling edge of SCLK.
The read mode is started if the R/W bit is high on the first falling edge of SCLK. The ID, Address, and Data are
all then subsequently read by the L7250 on the falling edges of SCLK. (See Figure 1)
The microcontroller has to read the data on the falling edge of the SCLK signal. After the hold time (Tedh) the
data line switches to the next data without a tri-state phase.During a read mode the last address bit is read by
L7250 on the eighth falling edge of SCLK. The internal state machine then turns the SDATA bit around for the
L7250 to assume control at the next SCLK rising edge (the first rising edge after the 8th SCLK falling edge).
11/46
11 Page | ||
| Páginas | Total 46 Páginas | |
| PDF Descargar | [ Datasheet L7250.PDF ] | |
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