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| 型号： | LV8105W |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.02 A, PQFP48 |
| 封装： | 7 X 7 MM, QFP-48 |
| 文件页数： | 11/21页 |
| 文件大小： | 202K |
| 代理商： | LV8105W |
LV8105W
No.A1271-19/21
10. Forward/Reverse switching circuit
The motor rotation direction can be switched by using the F/R pin. However, the following notes must be observed if
the motor direction is switched while the motor is turning.
This IC is designed to avoid through currents when switching directions. However, increases in the motor supply
voltage (due to instantaneous return of the motor current to the power supply) during direction switching may cause
problems. The values of the capacitors inserted between power and ground must be increased if this increase is
excessive.
If the motor current after direction switching exceeds the current limit value, the PWM drive side outputs will be
turned off, but the opposite side output will be in the short-circuit braking state, and a current determined by the motor
back EMF voltage and the coil resistance will flow. Applications must be designed so that this current does not exceed
the ratings of the output transistors used. (The higher the motor speed at which the direction is switched, the more
severe this problem becomes.)
11. Constraint protection circuit
The LV8105W includes an on-chip constraint protection circuit to protect the motor and the output transistors in motor
constraint mode. If the LD output remains high (indicating the unlocked state) for a fixed period in the motor drive state
(the S/S pin : start, the BR pin : brake release), the lower side output transistors (the UL, VL and WL side) are turned off.
This time can be set by adjusting the oscillation frequency of the CSD pin by using a external capacitor. By the
capacitance of the capacitor attached to the CSD pin, the set time is calculated as follows.
The set time (sec) = 60.8
× C (F)
When a 0.047
F capacitor is connected with the CSD pin, the set time becomes about 2.9sec.
By the variance of the IC, “60.8” of the above formula has varied from 40.8 to 80.8.
To restart a motor by cancelling the constraint protection function, any of the following operation is necessary.
Put the S/S pin into the start state again after the stop state (about 1ms or more).
Put the BR pin into the brake release state again after the braking state (about 1ms or more).
Turn on the power supply again after the turn off state.
When the clock disconnect protection function, the thermal shutdown function and the low-voltage protection function
are operating, the constraint protection function does not operate even if the motor does not rotate.
The oscillation waveform of the CSD pin is used as the reference signal for some circuits in addition to the motor
constraint protection circuit. Therefore, it is desirable to oscillate the CSD pin even if the constraint protection function
is unnecessary. If the constraint protection circuit is not used, the oscillation of the CSD pin must be stopped by
connecting a 220k
resistor and a 0.01F capacitor in parallel between the CSD pin and GND. However, in that case,
the clock disconnection protection circuit will no longer function. Also, the synchronous rectification does not operate
in any of the following cases.
When the motor does not rotate in the motor constrained state since the motor is started up by the S/S or the BR input,
the PWM switching is performed by using the current limiter circuit. But, the synchronous rectification does not
operate when the oscillation of the CSD pin is stopped.
The CSD pin combines also functions as the initial reset pin. The time that the CSD pin voltage is charged to about
1.25V is determined as the initial reset. At the initial reset, all the outputs will be in the off state.
12. Clock disconnection protection circuit
If the clock input through the CLK pin goes to the no input state in the motor drive state (the S/S pin : start, the BR pin :
brake release), the lower side output transistors (the UL, VL and WL side) are turned off. If the clock is resupplied, the
clock disconnection protection function is cancelled.
When the clock period is longer than about thirty-fourth part of the constraint protection set time, the clock
disconnection protection circuit judges the clock input to be the no input state and this protection function will operate.
13. Thermal shutdown circuit
If the junction temperature rises to the specified temperature (TSD) in the motor drive state (the S/S pin : start, the BR
pin : brake release), the lower side output transistors (the UL, VL and WL side) are turned off. If the junction
temperature falls to more than the hysteresis width (
TSD), the thermal shutdown function is cancelled.
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相关代理商/技术参数 |
参数描述 |
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| LV8105W-MPB-E | 功能描述:马达/运动/点火控制器和驱动器 RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| LV8105W-TLM-E | 功能描述:马达/运动/点火控制器和驱动器 BRUSHLESS MOTOR RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| LV810FI | 功能描述:IC CLK BUFF 1:10 133MHZ 20-SSOP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 时钟缓冲器，驱动器 系列:- 标准包装:1 系列:HiPerClockS™ 类型:扇出缓冲器（分配），多路复用器 电路数:1 比率 - 输入:输出:2:18 差分 - 输入:输出:是/无 输入:CML，LVCMOS，LVPECL，LVTTL，SSTL 输出:LVCMOS，LVTTL 频率 - 最大:250MHz 电源电压:2.375 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:32-LQFP 供应商设备封装:32-TQFP（7x7） 包装:- 其它名称:800-1923-6 |
| LV810FILF | 功能描述:时钟缓冲器 RoHS:否 制造商:Texas Instruments 输出端数量:5 最大输入频率:40 MHz 传播延迟（最大值）: 电源电压-最大:3.45 V 电源电压-最小:2.375 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LLP-24 封装:Reel |
| LV810FILFT | 功能描述:时钟驱动器及分配 RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
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