參數(shù)資料
型號: L6725ATR
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
封裝: SOP-16
文件頁數(shù): 14/34頁
文件大小: 962K
代理商: L6725ATR
L6725 - L6725A
Application details
21/32
Modulator singularity frequencies:
Compensation network singularity frequencies:
Compensation network design:
Put the gain R5/R3 in order to obtain the desired converter bandwidth:
Place
ω
Z1 before the output filter resonance ωLC;
Place
ω
Z2 at the output filter resonance ωLC;
Place
ω
P1 at the output capacitor ESR zero ωESR;
Place
ω
P2 at one half of the switching frequency;
Check the loop gain considering the error amplifier open loop gain.
Figure 15. Asymptotic Bode plot of Converter's open loop gain
Cout
L
LC
=
1
ω
Cout
ESR
=
1
ω
(8)
(9)
+
=
19
18
19
18
5
1
C
R
P
ω
20
4
2
1
C
R
P
=
ω
(10)
(11)
19
5
1
C
R
Z
=
ω
()
4
3
20
2
1
R
C
Z
+
=
ω
(12)
(13)
LC
C
Vosc
Vin
R
=
3
5
(14)
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