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L6725TR 数据表(PDF) 21 Page - STMicroelectronics

部件名 L6725TR
功能描述  Voltage mode PWM controller with bootstrap anti-discharging system
PDF  32 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6725TR 数据表(HTML) 21 Page - STMicroelectronics

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L6725 - L6725A
Application details
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●
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
ESR
⋅
=
1
ω
(8)
(9)
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⋅
⋅
=
19
18
19
18
5
1
1
C
C
C
C
R
P
ω
20
4
2
1
C
R
P
⋅
=
ω
(10)
(11)
19
5
1
1
C
R
Z
⋅
=
ω
()
4
3
20
2
1
R
R
C
Z
+
⋅
=
ω
(12)
(13)
LC
C
Vosc
Vin
R
R
ϖ
ϖ
⋅
∆
⋅
=
3
5
(14)



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