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发表于 2014-8-6 16:20:48
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The subharmonic pole peaking is akin to the double-pole response of an LC filter. So it, too,
has a certain “Q”, which depends on the slopes of the inductor current, and the applied slope
compensation. If the applied slope compensation is too low, the Q will increase, unless we
increase the inductance (to decrease the slopes of the inductor current correspondingly).
In effect, this means we need a certain minimum inductance for a given slope compensation,
to remain stable. Alternatively, we need a minimum slope compensation for a given
inductance, to remain stable. However, slope compensation, the way it is commonly applied,
affects the peak current limit too, and that can affect the output power capability of the
converter. |
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