(rumor)RTX3080/90設計出包? - 3C

By Irma
at 2020-09-27T11:23
at 2020-09-27T11:23
Table of Contents
原文吃光光~
最近RTX Cap Issue狀況之拙見
因為GPU供電是多相VRM,各相依序運作,交錯時會產生一個很小的空窗期,所以會疊加一
個交換頻率*相數的交換雜訊在輸出上,這時輸出端會配置兩種電容,SP-CAP/POSCAP與
MLCC,前者容值較大,可儲能,主要用於交錯空窗期釋放輸出以穩定輸出,後者因為等效
阻抗低,用於輸出端高頻雜訊去耦/退耦(另一個說法是把高頻雜訊旁路到GND上),一般來
說兩者要混合搭配,因為核心電壓很低,如果VRM輸出的高頻雜訊振幅太大時,會導致電
路誤動作(因雜訊疊加電壓後影響高速信號H/L判斷),如果都只有SP-CAP/POSCAP,則高頻
雜訊沒地方走,如果只有MLCC,又不夠在相與相交錯的空窗期提供足夠儲能穩定輸出,
SP-CAP/POSCAP與MLCC是相輔相成,缺一不可
目前EVGA在官方論壇的說法,6顆POSCAP也是翻車,四顆POSCAP+20顆MLCC與五顆
POSCAP+10顆MLCC相對安定,這次TUF版後面全上MLCC,也是蠻特別的方案
主機板CPU插槽中央或是背面,也可以看到許多的MLCC,有些使用者會依此作為用料的參
考
但是MLCC有兩個比較討厭的特點
1.因其積層結構,會導致某些場合下有如壓電元件般振動並發出聲音
2.因外力/振動/溫度衝擊使本體微裂後會造成短路,產生大量發熱,造成自己及
鄰近電路區域因嚴重發熱而燒焦
以上報告完畢
--
最近RTX Cap Issue狀況之拙見
因為GPU供電是多相VRM,各相依序運作,交錯時會產生一個很小的空窗期,所以會疊加一
個交換頻率*相數的交換雜訊在輸出上,這時輸出端會配置兩種電容,SP-CAP/POSCAP與
MLCC,前者容值較大,可儲能,主要用於交錯空窗期釋放輸出以穩定輸出,後者因為等效
阻抗低,用於輸出端高頻雜訊去耦/退耦(另一個說法是把高頻雜訊旁路到GND上),一般來
說兩者要混合搭配,因為核心電壓很低,如果VRM輸出的高頻雜訊振幅太大時,會導致電
路誤動作(因雜訊疊加電壓後影響高速信號H/L判斷),如果都只有SP-CAP/POSCAP,則高頻
雜訊沒地方走,如果只有MLCC,又不夠在相與相交錯的空窗期提供足夠儲能穩定輸出,
SP-CAP/POSCAP與MLCC是相輔相成,缺一不可
目前EVGA在官方論壇的說法,6顆POSCAP也是翻車,四顆POSCAP+20顆MLCC與五顆
POSCAP+10顆MLCC相對安定,這次TUF版後面全上MLCC,也是蠻特別的方案
主機板CPU插槽中央或是背面,也可以看到許多的MLCC,有些使用者會依此作為用料的參
考
但是MLCC有兩個比較討厭的特點
1.因其積層結構,會導致某些場合下有如壓電元件般振動並發出聲音
2.因外力/振動/溫度衝擊使本體微裂後會造成短路,產生大量發熱,造成自己及
鄰近電路區域因嚴重發熱而燒焦
以上報告完畢
--
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