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本帖最後由 ziv0819 於 2012-5-18 04:34 PM 編輯
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# l0 y8 g6 ], B1 L這部份是說明esr補償的部份!
( ^5 Y) @+ `2 k8 O. T$ O7 D有些東西我看不懂想請問各位大大!感謝!5 u/ C) r! \5 u5 _! V
The incomplete pole-zero cancellation may
, l ]3 |3 \4 e' r- E2 Dlead to instability of the LDO in the worst condition. Small
; z5 i; h, z, r. U, Npole-zero frequency mismatch within the unity-gain frequency9 t, d [6 Z. b8 }+ m5 i6 N
can degrade the quasi-linear transient settling behavior [6],3 Z8 |$ G" d% L, J/ ~* Y$ P5 Q' {) _
[7] of the LDO upon load switching. Even worse, if the ESR
6 \# F. q' [# A1 {+ y4 Z kzero approach is adopted, the resistor leads to large output0 W) c* g! l. U2 a4 `) j9 C
overshoots and undershoots during massive load-current step" W' j/ N+ W" o/ l5 t; q7 ~
changes especially when a low-value output capacitor of
2 g0 w) ]5 V X7 @5 z! ]% X5 ~: Rmicro-farad range is used.
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: ^7 R/ X9 Q/ r4 c" T我自已想這段話大楖是說明
# l& B# ]# B8 x6 J( a. p* |若是esr補償點跑掉的話
& [0 b! U% a8 g$ i- ~( M在esr電容較小的情況下~
' x7 c8 G9 V$ J% k4 \' U/ u輸出的暫態電壓反而會因為esr補償的電阻而產生大的跳動! {" ?' M8 m& H: l1 K' k
(overshoots and undershoots指的是跳動吧??)
3 o8 ]: j* V6 \2 A6 B: v不知道這樣是不是正確的意思??7 J) d! m6 B) @; k
另外紅色字體部份有大大可以幫我翻譯一下嗎??1 g; m$ i; x9 r9 d& e5 v
不太懂紅色字體正確的含義是什麼??感恩!) n& }1 Z1 ~! z# k: T [' f; x
1 \0 J. n3 N, E- p另外想問一下~如果本文真的是我想的這樣的話!
* `2 B* g, ]5 g. _, B" u, I* X4 }有大大可以告訴我為什麼esr電阻會讓跳動變大嗎?5 w) m G$ T6 \* Y* j3 N" Y. ]
是否有paper在說明這個部份的原理?. c3 V. Q& H8 K, u D7 t
這個現象有什麼特殊的名詞嗎??謝謝! |
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