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| 型号： | LB11695M |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.04 A, PDSO30 |
| 封装： | 0.375 INCH, FP-30 |
| 文件页数： | 8/17页 |
| 文件大小： | 419K |
| 代理商： | LB11695M |
LB11695M
No.7948-16/17
9. Constraint Protection Circuit
The LB11695M is provided with a constraint protection circuit that protects the IC itself and the motor in case the
motor is physically constrained (held stopped). The protection circuit turns off the outputs on one side (UH, VH, and
WH) when the Hall input signals remain unchanged for a certain time in the motor drive mode. The time the Hall
input signals remain unchanged (protection time) is determined by the capacitance of the capacitor connected to the
CSD pin.
Setup time (s)
≈ 154×C (F)
A 0.01F capacitor provides a protection time of approximately 1.54 seconds. The drive mode is turned off when one
period of the Hall input signals become longer than this time). This time should be configured with an adequate
margin of safety so that the protection circuit will not get activated in the normal motor startup time. More
specifically, the capacitance of the capacitor to be used for this purpose must be 4700pF or larger. One of the
following actions must be taken to restore the IC from the constraint protection state:
Keeping the IC in the stopped state (10s or longer)
Keeping the 0% output duty state of the IC, which is placed by the VCTL input or PWMIN input, for a period of
tCSD
×2 or longer. (The 0% output duty state must be maintained for approximately 10ms or longer if a capacitor
with a capacitance of tCSD (s)
≈ 0.5×C (F) or 0.01F is used.)
Turning off and on the power
Since the CSD pin is also used to generate the initial reset pulse, any attempt to connect this pin to ground causes
the logic circuit to be reset, disabling the motor to be driven. Accordingly, when the constraint protection function
is not to be used, connect a resistor of approximately 150k
and a capacitor of approximately 4700pF in parallel
between this pin and ground. The thermal protection circuit is also disabled when the constraint protection circuit is
disabled.
10. Thermal protection circuit
The thermal protection circuit turns off the outputs on one side (UH, VH, and WH) when the temperature at the
junction (Tj) goes beyond the predetermined temperature (TSD). Since the minimum value of the variations of TSD
values is 125
°C, thermal design must be carried out so that the junction temperature can never exceed 125°C except
under abnormal conditions. Consequently, the value of Pd max is calculated as 0.72W (Ta = 25
°C) for a Tj (max)
value of 125
°C.
The thermal protection circuit will be disabled if the constraint protection function is disabled by connecting a
resistor of approximately 150k
and a capacitor of approximately 4700pF in parallel between the CSD pin and
ground. In this case, Tj (max) = 150
°C holds and Pd max = 0.9W (Ta = 25°C) is derived.
11. Forward/Reverse Direction Switching
This IC is designed so that through currents (due to the output transistor off delay time when switching) do not flow
in the output when switching directions while the motor is turning. However, if the direction is switched when the
motor is turning, currents in excess of the current limiter value may flow in the output transistors due to the motor
coil resistance and the motor back EMF state when switching. Therefore, designers must consider selecting external
output transistors that are not destroyed by those currents or only switching directions after the speed has fallen
below a certain speed.
12. Power Supply Stabilization
Since this IC uses a switching drive technique, the power supply line level can be disturbed easily. Therefore
capacitors with adequate capacitance to stabilize the power supply line must be inserted between VCC and ground.
If diodes are inserted in the power supply lines to prevent destruction if the power supply is connected with reverse
polarity, the power supply lines are even more easily disrupted, and even larger capacitors are required.
If the power supply is turned on and off by a switch, and if there is a significant distance between that switch and the
stabilization capacitor, the supply voltage can be disrupted significantly by the line inductance and surge current into
the capacitor. As a result, the withstand voltage of the device may be exceeded. In application such as this, the surge
current must be suppressed and the voltage rise prevented by not using ceramic capacitors with a low series
impedance, and by using electrolytic capacitors instead.
13. VREG Stabilization
To stabilize the VREG voltage, which is the control circuit power supply voltage, a 0.1F or larger capacitor must be
inserted between the VREG pin and ground. The ground side of this capacitor must be connected to the IC ground
pin with a line that is as short as possible.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB11695M-TLM-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LB11696V | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Direct PWM Drive Brushless Motor Predriver IC |
| LB11696V-D | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Direct PWM Drive Brushless Motor Predriver IC |
| LB11696VGEVB | 功能描述:电源管理IC开发工具 EVM FOR LB11696V RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| LB11696V-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 |
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