KA2822CD データシートの表示（PDF） - Fairchild Semiconductor

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KA2822CD

3-Phase BLDC Motor Driver

Fairchild Semiconductor 

KA2822CD

Application Information

1. Chip Enable

This function turns on or off all blocks by low or high signal (active low).

2. U, V And W Phase Output Amp

These ampilifiers drive three output phases - U, V, and W which have 120 degree phase differences with each other. The three

phase waveforms are made with the two hall sensor signals by synthesizing the third phase signal.

3. Speed Control Part

This function compares the real motor rotation frequency with the 300 or 360Hz pulse divided from 1MHz clock pulse for

removing speed error when the motor is ’on’ and speed error is detected by PLL. The speed error is sent to the charge pump,

which repeats charging and discharging by the error. The charge pump output controls the output current to keep a stable rota-

tional speed.

4. Sensorless Index Signal Generation

KA2822CD can make index signals without an index hall sensor by special rotor magnetization.

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