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在CS51411/NCV51411减少开关节点抖动的布局指南
消耗积分:3 |
格式:rar |
大小:2 |
2009-04-27
KANA
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Introduction
The CS5141x product family has shown some sensitivityto noise which shows up as jitter on the Switch Node pin(VSW). The CS51411 family uses V2 control to achievesuperior line and load. This control method enhances theload transient response, but under certain conditions canlead to jitter if proper care is not taken. V2 performs similarlyto current mode control, but that the gain is much higher. Thegain is set up by the output ripple voltage plus the internal
ramp. As you decrease the output voltage, you also decreaseripple voltage which, in turn, increases gain. With a highgain, the PCB layout becomes very critical. This reportshows how minor changes in layout can greatly improveVSW jitter on the CS51411 family of buck converters.
The CS5141x product family has shown some sensitivityto noise which shows up as jitter on the Switch Node pin(VSW). The CS51411 family uses V2 control to achievesuperior line and load. This control method enhances theload transient response, but under certain conditions canlead to jitter if proper care is not taken. V2 performs similarlyto current mode control, but that the gain is much higher. Thegain is set up by the output ripple voltage plus the internal
ramp. As you decrease the output voltage, you also decreaseripple voltage which, in turn, increases gain. With a highgain, the PCB layout becomes very critical. This reportshows how minor changes in layout can greatly improveVSW jitter on the CS51411 family of buck converters.
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