日本电子维修技术 [广达案例】-电源毛刺波形 分析过程
Glitch Issue* 5V_RUN, 5V_SUS, and 3V_SUS have glitch issue in system shut down. Following are the waveforms.
CH1:+5V_RUNCH2:+3.3VSUSCH3:+5V_SUS
file:///C:/Documents%20and%20Settings/ljjvip/Application%20Data/Tencent/Users/274482736/QQ/WinTemp/RichOle/_4J%7B6_)OMFX5ZWP69E%7D2%60O2.jpg
*Compare ISL6236 and MAX8778 controller for this issue. Following is +5V_RUN schematic.
file:///C:/Documents%20and%20Settings/ljjvip/Application%20Data/Tencent/Users/274482736/QQ/WinTemp/RichOle/25MV$3A3LL%7BINWZ%608%7BG7BM7.jpg
1. Controller of +3.3_ALW and +5V_ALW: ISL6236CH1:+5V_ALWCH2:+15V_ALWCH3:+5V_ALW2CH4:+5V_RUN
[img=675,418]file:///C:/Documents%20and%20Settings/ljjvip/Application%20Data/Tencent/Users/274482736/QQ/WinTemp/RichOle/ZBBVLI]55Z6J[QP$Q2PEJ59.jpg[/img]
file:///C:/Documents%20and%20Settings/ljjvip/Application%20Data/Tencent/Users/274482736/QQ/WinTemp/RichOle/0)GRC4(EDPBY(1JVV(CK~SR.jpg
The waveforms show the glitch root cause. When +5V_ALW2 down to zero, the +15V_ALW is 5.16V and +5V_ALW is 3.46V. The PQ44 will be turn on, then cause this issue.
[Summary]: When system shut down, +5V_ALW2 down to zero immediately for ISL6236 IC.So ISL6236 has glitch issue.
[Solution]: Put PR65 into 10ohm.When +3.3V_ALW, +5V_ALW and +5V_ALW2 shut down, Vcc(pin3) of ISL6236 exist 3.6V. In the other words,Vcc(pin3) will appear 3.6V as long as Vin(pin6) present. So +5V_ALW2 will exist a voltage velua(about 2.8V) in shut down. This issue can be solved when put PR65 into 10ohm.
[img=768,330]file:///C:/Documents%20and%20Settings/ljjvip/Application%20Data/Tencent/Users/274482736/QQ/WinTemp/RichOle/L)TCW_XPB%60CO%252NNS938[WB.jpg[/img]
评论
在哪复制的吧
评论
看情况是为了转正的，无语
评论
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