參與:2追蹤:0
PFC的软启动问题
針對方案:基于AOS AOZ7111AI 的高效率CRM模式PFC TV电源方案
PFC部分的软启动是如何完成呢？启机的电流可能较大的。
5得分
提問者
最佳解
AOZ7111 employs an internal soft-start function to
suppress inrush current and overshoot of output voltage
during the startup. The soft-start circuit works after UVLO
and standby are released and before the soft-start
cancellation voltage is exceeded. During the soft-start,
the OTA supplies a constant 10μA into the compensation
network at the COMP pin. The voltage at this pin rises
linearly as well as the amplitude of the input current. As
soon as the output voltage VOUT reaches 95% of its rated
level, the startup procedure is finished and the normal
voltage control takes over.
1F
