LB1929 データシートの表示（PDF） - ON Semiconductor

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LB1929

Monolithic Digital IC For Office Automation Equipment 3-phase Brushless Motor Driver

ON Semiconductor 

LB1929

11. Power supply stabilization

Because this IC provides a high output current and uses a switching drive technique, power supply line fluctuations

can occur easily. Therefore, a capacitor of sufficient capacitance (several ten μF or higher) must be connected

between the VCC pin and ground to assure stable operation. The ground connection of this capacitor must be

connected to the GND2 pin, which is the power block ground, at a point as close as possible to the IC. If, due to

problems associated with the heat sink, the (electrolytic) capacitor cannot be connected near the this pin, a ceramic

capacitor of about 0.1μF must be connected near the pin.

Since the likelihood of power line fluctuation increases if diodes are inserted in the power supply lines to prevent

destruction of the IC if power is connected with reverse polarity, a larger capacitance will be required.

12. VREG stabilization

A capacitor (about 0.1μF) must be connected to the VREG pin (the 5V regulator output), which functions as the

control circuit power supply, for stabilization. The ground side of this capacitor must be connected to the GND1 pin

with a lead that is as short as possible.

13. Integrating amplifier related component values

The external components used in the integrating amplifier must be located as close as possible to the IC to

minimize the circuit’s susceptibility to noise. These components must be located as far as possible from the motor.

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PS No.7099-11/11

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