LB1882V データシートの表示（PDF） - SANYO -> Panasonic
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LB1882V Datasheet PDF : 9 Pages
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LB1882V
LB1882V Operating Principles
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 1/2π·RC.
• 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 lower-side 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.
No. 4626-7/9
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