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PDF ( 数据手册 , 数据表 ) L7250

零件编号 L7250
描述 5V & 12V SPINDLE AND VCM MOTORS DRIVER
制造商 STMicroelectronics
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L7250 数据手册, 描述, 功能
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.







L7250 pdf, 数据表
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
err _clamp High output (clamp) voltage
high
Isource = 1mA, referred to Vref25 TBD
V
VCM OUTPUT DRIVERS
PWR_Gain Power amplifier differential gain. Io = ±1A, Rload = 8
14 15 16 V/V
Rds(on) Total output ON resistance
(Source + Sink)
@ 125°C, I=2A
.9
PWR_Lkg Output leakage current
600 uA
DiodeFw Clamp diode forward voltage
If = 2A
0.6 1.2 V
THD Total Harmonic Distortion
characterized no tested
1%
PWR_Slew VCMN or VCMP slew rate
RL = 8 ohms
1 V/us
PWR_B Power Amp -3dB Bandwidth
and
Driving ERROUT = VDACREF,
Guaranteed by design
250 500
kHz
Icross Static Shoot-through current
Guaranteed by design
0 mA
VCM CURRENT CONTROL LOOP STATIC AND DYNAMIC CHARACTERISTICS
IVCMoff Total offset current
Rs=0.2
-75 75 mA
DIVCMoff Total offset current drift
temperature coefficient
Guaranteed by design
.2 mA/oC
Gm_psrr Gm loop VSRR of VCV
-1 1 mA/V
VCM LINEAR DAC
DAC_res Resolution
15 bit
DAC_out Full Scale Output Voltage
wrt VDACREF
0.96 1 1.04 V
DAC_off Mid-Scale Error
wrt VDACREF
-12 12 mV
DAC_DNL Differential Non linearity
Guaranteed Monotonicity
±1 LSB
DAC_INL Integral Non Linearity
±64 LSB
DAC_Co Conversion time
nvT
90% from 3FFFh to 0020h
3 µs
VCM LOAD/UNLOAD
ADC
ADC_res resolution
ADC_DNL Differential Non Linearity
ADC_INL Integral Non Linearity
ADC_Co Conversion time
nvT
10 bit
1 LSB
3 LSB
40 ADC
Clock
cycles
8/46







L7250 equivalent, schematic
L7250
Table 1. Register Map
addr
b7
b6
b5
b4
b3
b2
b1
b0
00H SPNCurrSi VCMcalOut ZCBad ThShutdown ThWarn
rev2
rev1
rev0
gn
01H RLvoltage1 RLvoltage1 RLvoltage2 RLvoltage2 Rltimer[2] Rltimer[1] Rltimer[0] NoBrake
[1] [0] [1] [0]
02H ShockConf ShockTh[0] RLToffBrake RLToffBrake Rlcalib[3] Rlcalib[2] Rlcalib[1] Rlcalib[0]
[1] [0]
03H BemfOffCal VCMState2 VCMState1 VCMState0 SPstate3 SPstate2 SPstate1 SPstate0
04H SPslew2 SPslew1 SPslew0 Curdac2 Curdac1 Curdac0 PWMmask1 PWMmask0
05H SPIprot m3
m2
m1
m0
TSDen
VnegEn
Sken
06H w4 w3 w2 w1 w0 PREADC(1) PREADC(0) PREsmo
07H
LoadCP
Advance
FFWEn
TO4
TO3
TO2
TO1
TO0
08H Kv7 Kv6 Kv5 Kv4 Kv3 Kv2 Kv1 Kv0
09H GainSwitch dac14
dac13
dac12
dac11
dac10
dac9
dac8
0AH dac7 dac6 dac5 dac4 dac3 dac2 dac1 dac0
0BH ADC_DATA ADC_DATA ADC_DATA ADC_DATA ADC_DATA ADC_DATA ADC_DATA ADC_DATA
(9) (8) (7) (6) (5) (4) (3) (2)
0CH ADC_DATA ADC_DATA ADC_RES ADC_RES ADCRange ADC_CH_ ADC_CH_ ADC_START
(1) (0) _ADDR(1) _ADDR(0)
ADDR(1) ADDR(0)
0DH reserved reserved reserved reserved reserved reserved reserved reserved
0EH reserved reserved reserved reserved reserved reserved reserved reserved
0FH test7 test6 test5 test4 test3 test2 test1 test0
name
SR
VCM1
VCM2
CTR1
CTR2
CTR3
CTR4
CTR5
KVR
DAR1
DAR2
ADR
ADR
TEST
mnemoni
attributes
c
status
readonly
VCM RLreg read/write
VCMRL reg read/write
SP&VCMst read/write
ate
control
read/write
control
read/write
control
read/write
control
read/write
Kval read/write
DAC reg 1 read/write
DAC reg 2 read/write
ADC reg readonly
ADC reg read/write
read/write
read/write
test read/write
16/46










页数 46 页
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