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L6725 データシート(PDF) 19 Page - STMicroelectronics

部品番号 L6725
部品情報  Low cost adjustable step-down controller
PDF  27 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6725 データシート(HTML) 19 Page - STMicroelectronics

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●
Compensation network design:
–
Put the gain R5/R3 in order to obtain the desired converter bandwidth:
–
Place
ω
Z1 before the output filter resonance
ω
LC;
–
Place
ω
Z2 at the output filter resonance
ω
LC;
–
Place
ω
P1 at the output capacitor ESR zero
ω
ESR;
–
Place
ω
P2 at one half of the switching frequency;
–
Check the loop gain considering the error amplifier open loop gain.
Figure 12. Asymptotic Bode plot of Converter's open loop gain
LC
C
Vosc
Vin
R
R
ϖ
ϖ
⋅
∆
⋅
=
3
5
(14)



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