The difference between the 8a chip and the 46 chip is the performance difference
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8a chip is a boost chip, which is a high-performance current mode intelligent switching controller integrated circuit, designed for non-isolated offline and DC-DC switching buck converters such as small home appliance control board power supply.
The 46 chip is a motion control chip, which can control two servomotor or stepper motors at the same time. It is output in the form of pulse series, which can control the position of servo motor or stepping motor, interpolation drive, speed control, etc