Soft-Start Controller for Switching Power Supplies


Posted on Jul 17, 2012

Start-up is a stressful time for the power driver section of a switching power supply. Because the output voltage is initially zero, the feedback error initially jumps to its maximum. The large feedback error then drives the loop filter to its limit, which drives the power switching transistors in the driver section of the power supply at their maximum rating. This condition continues until the output voltage of the power supply approaches its nominal value.



Soft-start circuits alleviate this problem by ramping up the output of the power supply at a slower rate. The reduced rate limits the initial error and the overall drive of the system is reduced. Typically, soft-start is accomplished in one of two way




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