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L6732 Datasheet(PDF) 25 Page - STMicroelectronics

Part # L6732
Description  Adjustable step-down controller with synchronous rectification
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6732 Datasheet(HTML) 25 Page - STMicroelectronics

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L6732
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Equation 14
●
Compensation network singularity frequencies:
Equation 15
Equation 16
Equation 17
Equation 18
●
Compensation network design:
–
Put the gain R5/R3 in order to obtain the desired converter bandwidth
Equation 19
–
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.
Cout
ESR
ESR
⋅
=
1
ω
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⋅
⋅
=
19
18
19
18
5
1
1
C
C
C
C
R
P
ω
20
4
2
1
C
R
P
⋅
=
ω
19
5
1
1
C
R
Z
⋅
=
ω
()
4
3
20
2
1
R
R
C
Z
+
⋅
=
ω
LC
C
Vosc
Vin
R
R
ϖ
ϖ
⋅
∆
⋅
=
3
5



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