Can you talk about loop design specifically?
The gain of the feedback loop is neither as large as possible, nor as small as possible. When the gain of the feedback loop is too high, the output voltage will track back and forth around the average value. The output voltage fluctuates up and down very much. The higher the gain, the larger the amplitude of the fluctuation. When it is severe, the oscillation occurs. When the feedback loop gains. When it is too low, the output voltage will be unstable again, because the voltage tracking is not in place, there will be a hysteresis error.
In order to stabilize the output voltage without oscillating, the feedback loop is generally divided into three loops. One loop is used to determine the magnitude of the differential gain, the other loop is used to determine the magnitude of the integral gain, and one is Determine the size of the DC gain. The purpose of this is that the loop gain is large when the error signal is small, and the loop gain is smaller when the error is small, that is, the gain of the error amplifier is dynamic. By carefully adjusting the gain of these three feedback loops, the switching power supply can be stabilized without oscillation.
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