LB1950 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LB1950

Three-Phase Brushless Sensorless Motor Driver

SANYO -> Panasonic 

LB1950V

Control System Operation

The LB1950V is a current-linear drive motor driver. It implements motor power-supply voltage based speed control by

continually preventing coil output saturation and maintaining the output saturation voltage at the value set by the circuit.

1. The LB1950V detects the sum of the coil output voltage lower side envelope and the diode threshold voltage.

2. The low-pass filter formed by the internal 30-kΩ resistance and the capacitor connected between the FILTER and

GND pins cuts the high-frequency components of the envelope waveform. (The cutoff frequency is 1/2πCR.)

3. The FILTER pin voltage is input to the control amplifier + pin. The reference voltage is input to the control amplifier

– pin, and the control amplifier operates to force the FILTER pin voltage to the same potential as the reference

voltage. The coil output operates in the unsaturated region if this reference voltage is higher than the output transistor

saturation voltage.

4. Also, since the second control amplifier stage controls the RF voltage to a fixed level, the output current (i.e., the RF

current) becomes a fixed current drive.

Supplement: The low-frequency components that are not filtered out by the RC filter on the FILTER pin function to

correct motor torque ripple.

Control System Signals

No. 5340-9/10

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