如何降低待机能耗ON Semiconductor

简介：

问：我初次来，请问NCP12xx主要针对哪些产品的电源设计呢？
答： NCP120x are general purpose IC"s and they can be used everywhere in flyback topology.  Key applications include adaptors, DVD players, PC power supplies, TV, etc.

问：请介绍一下安森美公司的产品大致分类，和致力于降低待机功耗的产品优势。
答： I"ll suggest customers to visit our websites,

English : www.onsemi.com
Chinese : www.onsemi.com.cn

问：Vds零电压开关如何实现？是否需要在外电路加检测电路？
答： We use Quasi-Resonant method to detect this, for ours QR mode controller, it don"t need to add addtional circuit for it.

问：请问怎样降低液晶屏幕的能耗？
答： This relates to LCD driver IC and the supply DC-DC controllers (if any).  ON does not have LCD driver, but we have high efficiency DC-DC converters, e.g., NCP1410 (92% efficiency).

问：在待机状态，能耗的降低会不会将系统稳定性降低？
答： For two method under standby:
1.hight voltage winding down to MCU low voltage power, the system would into burst mode, the output voltage has more ripple, but it still under feedback loop, so for some of critical application, a linear regulator e.g. 78

问：关于待机功耗，
1。在设计时应当注意那些方面的问题？
2。在测试时又应当注意什么样的问题？
答： You may refer to page 3 of the presentation to see the source of loss and cure it one by one.

Testing technique is covered on page 24.

问：陈先生，您好，请问使用NCP1200做AC/DC时，其最大的输入范围（86~260ACV？？？）和输出最大功率是多少；做FCC/UL需注意些什么，谢谢！
答： NCP1200 can handle 86-260Vac.  The max. output quite depends on your MOSFET and transformer size.  We have circuit tested to drive 70W.  EMI should be consider at system level, not IC alone.

问：降低待机能耗的技术的关键是什么?能降低到什么程度?
答： To reduce standby power, one has to reduce number of switching cycle and yet has to maintain output in regulation.  At the present moment, we can achieve less than 0.1W under load condition for a 70W universal power supply.

问：in order to reduce the standby power cost,i think it is important that how to select a discrete component,could you tell me how to do that?thank you.
答： Do you mean the MOSFET?

Low gate charge and Cds would be helpful.

问：你们的节电王IC产品，如NCP1200 、NCP1203、NCP1205、MC44608等可以提供样片吗?如可以,怎么联系?
答： Of course, we can provide samples. You may contact our local distributors.  If you have difficulties, please email to manson.chan@onsemi.com.