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參數(shù)資料
| 型號(hào)： | LB11870 |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1.8 A, PDSO48 |
| 封裝： | 0.375 INCH, HSSOP-48 |
| 文件頁(yè)數(shù)： | 3/14頁(yè) |
| 文件大?。?/td> | 189K |
| 代理商： | LB11870 |
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LB11870
No.7256-11/14
Continued from preceding page.
Pin No.
Symbol
Pin Description
Equivalent Circuit
36
VREG
Stabilized power supply output (5V output).
Insert a capacitor of about 0.1
μF between this
pin and ground for stabilization.
40
VCC1
Power supply.
Insert a capacitor of at least 10F between this
pin and ground to prevent noise from entering
the IC.
2, 4, 5
7, 18
20, 30
31, 41
42, 43
45, 47
48
NC
Since these pins are not connected to the IC
internally, they can be used for wiring
connections.
FRAME
Connect this pin to ground.
Overview of the LB11870
1. Speed Control Circuit
This IC adopts a PLL speed control technique and provides stable motor operation with high precision and low jitter.
This PLL circuit compares the phase error at the edges of the CLK signal (falling edges) and FG signal (falling edges
on the FGIN+ and FGS signals), and the IC uses the detected error to control motor speed.
During this control operation, the FG servo frequency will be the same as the CLK frequency.
fFG (servo) = fCLK
2. Output Drive Circuit
To minimize power loss in the output circuits, this IC adopts a direct PWM drive technique. The output transistors
are always saturated when on, and the IC adjusts the motor drive output by changing the output on duty. The low side
output transistor is used for the output PWM switching.
Both the high and low side output diodes are integrated in the IC. However, if reverse torque control mode is selected
for use during deceleration, or if a large output current is used and problems occur (such as incorrect operation or
waveform disruption due to low side kickback), a Schottky diode should be inserted between OUT and ground. Also,
if it is necessary to reduce IC heating during steady-state (constant speed) operation, it may be effective to insert a
Schottky diode between VCC and OUT. (This is effective because the load associated with the regenerative current
during PWM switching is born not by the on-chip diode but by the external diode.)
3. Current Limiter Circuit
The current limiter circuit limits the peak level of the current to a level determined by I = VRF/Rf (where VRF =
0.5V (typical) and Rf is the value of the current detection resistor). The current limiter operates by reducing the
output on duty to suppress the current.
The current limiter circuit detects the reverse recovery current of the diode due to PWM operation. To assure that the
current limiting function does not malfunction, its operation has a delay of about 2
μs. If the motor coils have a low
resistance or a low inductance, current fluctuations at startup (when there is no reactive power in the motor) will be
rapid. The delay in this circuit means that at such times the current limiter circuit may operate at a point well above
the set current. Designers must take this increase in the current due to the delay into account when setting the current
limiter value.
36
VCC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LB11870 | BRUSHLESS DC MOTOR CONTROLLER, 1.8 A, PDSO48 |
| LB11872H | BRUSHLESS DC MOTOR CONTROLLER, 1.2 A, PDSO30 |
| LB11876 | BRUSHLESS DC MOTOR CONTROLLER, 0.03 A, PDSO36 |
| LB11889M | BRUSHLESS DC MOTOR CONTROLLER, 1.3 A, PDSO36 |
| LB11946 | STEPPER MOTOR CONTROLLER, 1.2 A, PDIP28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB11870_07 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Polygonal Mirror Motors Three-Phase Brushless Motor Driver |
| LB11870-MPB-E | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB11870-TRM-E | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 BRUSHLESS MOTOR DRIVER RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB11872H | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Three-Phase Brushless Motor Driver for Polygonal Mirror Motors |
| LB11872H_08 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Polygonal Mirror Motors Three-Phase Brushless Motor Driver |
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