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参数资料
| 型号： | LB1882V |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1 A, PDSO24 |
| 封装： | SSOP-24 |
| 文件页数： | 7/9页 |
| 文件大小： | 103K |
| 代理商： | LB1882V |
LB1882V
No.4626-7/9
Continued from preceding page.
Pin No.
Symbol
Pin Voltage
Pin Function
Equivalent Circuit
16
17
18
19
20
21
WIN2
WIN1
VIN2
VIN1
UIN2
UIN1
1.2V min
2.5V max
(Ta=25
°C
VCC1=2.5V)
W-phase Hall element input.
The logic high level is the state
where WIN1 > WIN2.
V-phase Hall device input.
The logic high level is the state
where VIN1 > VIN2.
U-phase Hall device input.
The logic high level is the state
where UIN1 > UIN1.
22
23
24
1
RF
UOUT
VOUT
WOUT
Output transistor ground.
Detecting the voltage on this pin is used to
implement fixed current drive and the current
limiter function.
U-phase output
V-phase output
W-phase output
Functional Description
The LB1882V implements a current linear drive method, and controls the motor speed with the motor power supply
voltage by always preventing coil output saturation and holding the output saturation voltage fixed.
(1) Control system (see page 8)
The TRC pin outputs a signal consisting of the coil output voltage lower-side envelope plus the diode rising
voltage.
The TRC waveform, after the high-frequency components are reduced by a low-pass filter consisting of an RC
circuit connected to the FILTER pin, is input to the FILTER pin. The cutoff frequency is 1/2
πRC.
The FILTER pin voltage is input to the control amplifier plus side. The control amplifier minus side is connected
to the reference voltage and the control amplifier operates to hold the FILTER pin at the same potential as this
reference voltage. As long as this reference voltage exceeds the output transistor saturation voltage, the coil output
will operate in the unsaturated state.
The output current (the RF current) operates as a fixed current drive since the RF voltage is held at a fixed level by
the second stage of the control amplifier.
Note: The low-frequency components that are not removed by the TRC pin RC filter function as motor torque ripple
correction signals.
(2) Drive system (See page 8.)
The Hall element output is wave shaped by the first stage of the Hall amplifier.
The Hall amplifier output waveform is synthesized by the matrix amplifier, which creates a waveform phase
delayed by 30
°.
This waveform is voltage-to-current converted and is then further current amplified and output as the coil current
by the power amplifier. Since the upper and lower transistor drive ratios differ here (the upper transistor drive
ratio is larger), the upper side voltage waveform is saturated, and the lower-side voltage waveform is unsaturated.
Note: The AGC circuit controls the Hall bias current so that the matrix amplifier output waveform has a fixed
amplitude.
ILB01050
VCC1
200
Ω
2k
Ω
2k
Ω
1k
Ω
1k
Ω
200
Ω
19
21
17
18
20
16
ILB01051
VS
23
22
24
1
3.9
Ω
3.9
Ω
5
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