- 您现在的位置：买卖IC网 > PDF目录43901 > L7250 (STMICROELECTRONICS) VOICE COIL MOTOR CONTROLLER, PQFP64 PDF资料下载
参数资料
| 型号： | L7250 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | VOICE COIL MOTOR CONTROLLER, PQFP64 |
| 封装： | TQFP-64 |
| 文件页数： | 14/46页 |
| 文件大小： | 478K |
| 代理商： | L7250 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页
21/46
L7250
2
SPINDLE MOTOR CONTROLLER
Figure 3.
2.1 Spindle Smoothdrive Functionality
L7250 utilizes ST's proprietary Smoothdrive commutation algorithm. Smoothdrive is a voltage mode pseudo-
sinusoidal spindle drive scheme where the duty cycles of the three windings are modulated to form sinusoidal
voltages across each winding. The system determines the shape and amplitude of the driving voltages in a
completely digital manner.
2.2 SYSCLK
The Smoothdrive system clock comes through the SYSCLK pin.
The system expects either 33MHz or 16.5MHz on this pin, and needs 16.5MHz internally. A SYSCLK divide by
two can be enabled by a SPI register bit PRESMO to accomodate a 33MHz external clock.
2.3 Smoothdrive Wave shape
The basic Smooth drive wave shape is stored in digital memory. A voltage profile designed to reduce switching
losses and increase the voltage headroom has been implemented. Essentially, two phases are PWM'ed, while
the low side driver of the third phase is on at 100% duty cycle. The PWM duty cycles are modulated in such a
way as to result in sinusoidal currents on all 3 motor phases. Driving in this manner, as opposed to driving true
sinusoids on all three phases, results in improved headroom and efficiency, approaching that of conventional 6
state commutation.
The system is phase locked to the motor by sensing one BEMF zero crossing on one winding, once per electrical
VM
HGU
MOTU
LGU
FET
GATE
DRIVE
VM
HGV
MOTV
LGV
FET
GATE
DRIVE
VM
HGW
MOTW
LGW
FET
GATE
DRIVE
xx
SMOOTHDRIVE
PROFILE
MEMORY/
LOGIC
MEMORY
ADDRESS
COUNTER
(N=48)
DIGITAL
MULTIPLIER
COUNTER
&
COMPARATORS
xx
CTAP
WINDOW
MASK
PWM MASK
ZERO
CROSSING
PERIOD
COUNTER
16+4 BIT
FSCAN
COUNTER
ZC
Tc
FSCAN
BEMF
COMP.
CURRENT
LIMIT
COMP.
ADVANCE
BIT
OLSIX/OLSIN
OR CLSIX/CLSIN
KVAL
REGISTER
KVAL
COARSE
PHASE
ADVANCE
BITS
FINE
PHASE
ADVANCE
BITS
SYSCLK
16.5MHZ
SPINDLE
MOTOR
LOADCP
BIT
SMOOTHDRIVE
RAW
DUTY CYCLE
SMOOTHDRIVE
MODULATED
DUTY CYCLE
TIME DOMAIN
DUTY CYCLE
SIGNALS
SPSENH
VM
ADC
START-OF-COUNT
SUPPLY
VOLTAGE
COMPENSATION
MASK
REGISTERS
WINDOW
TRISTATE
CMD
6 State
or
Sine
Mode
CUR DAC
相关PDF资料 |
PDF描述 |
|---|---|
| L7980A | 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| L7980 | 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| L7980TR | 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| L7981ATR | SWITCHING REGULATOR, DSO8 |
| L7981TR | SWITCHING REGULATOR, DSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L7250E1.2 | 功能描述:电源开关 IC - 配电 DSD POWER RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| L7252E2.6 | 功能描述:电源开关 IC - 配电 DSD POWER RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| L725MAG | 制造商:Apex Tool Group 功能描述:TAPE, 1 IN. X 25 FT, 700 SERIES, MAGNETIC END HOOK 制造商:Lufkin 功能描述:TAPE MEASURE, MAGNETIC END HOOK 25FT 1IN; Tape Measure Type:Manual; Measuring Range Max:25ft; Blade Width:1"; Case Color:Orange; Tool Body Material:ABS; Blade Finish:Yellow Clad; Blade Length:25ft ;RoHS Compliant: NA |
| L728 | 制造商:BURNDY 功能描述:L-DIE |
| L7290 | 制造商:CIPS 功能描述:CUTTER OBLIQUE SEMI FLUSH 109MM |
发布紧急采购，3分钟左右您将得到回复。