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L6738ATR Datasheet(PDF) 23 Page - STMicroelectronics

No. de pieza L6738ATR
Descripción Electrónicos  Embedded bootstrap diode
PDF  32 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6738ATR Datasheet(HTML) 23 Page - STMicroelectronics

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L6738A
Application details
Doc ID 18134 Rev 2
23/32
Figure 10.
Example of type III compensation.
●
Open loop converter singularities:
a)
b)
●
Compensation Network singularities frequencies:
a)
b)
c)
d)
To place the poles and zeros of the compensation network, the following suggestions may
be followed:
Gain
[dB]
Log (Freq)
0dB
open loop
EA gain
closed
loop gain
compensation
gain
open loop
converter gain
F
LC
F
ESR
F
Z1 FZ2
F
P1
F
P2
20log (R
F/RFB)
20log (V
IN/∆VOSC)
F
0dB
F
LC
1
2
π LC
OUT
⋅
-------------------------------------
=
F
ESR
1
2
π C
OUT
ESR
⋅⋅
-------------------------------------------------
=
F
Z1
1
2
π R
F
C
F
⋅⋅
------------------------------------
=
F
Z2
1
2
π
R
FB
R
S
+
() C
S
⋅⋅
----------------------------------------------------------
=
F
P1
1
2
π R
F
C
F
C
P
⋅
C
F
C
P
+
----------------------
⎝⎠
⎛⎞
⋅⋅
--------------------------------------------------------
=
F
P2
1
2
π R
S
C
S
⋅⋅
------------------------------------
=



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