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L5986ATR Scheda tecnica(PDF) 18 Page - STMicroelectronics

Il numero della parte L5986ATR
Spiegazioni elettronici  2.5 A step-down switching regulator
PDF  39 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5986ATR Scheda tecnica(HTML) 18 Page - STMicroelectronics

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Application information
L5986 - L5986A
18/39
Figure 8.
The error amplifier, the PWM modulation and the LC output filter
The transfer function on the LC filter is given by:
Equation 13
where:
Equation 14
Equation 15
As seen in Chapter 5.3 two different kind of network can compensate the loop. In the two
following paragraph the guidelines to select the Type II and Type III compensation network
are illustrated.
6.4.1
Type III compensation network
The methodology to stabilize the loop consists of placing two zeros to compensate the effect
of the LC double pole, so increasing phase margin; then to place one pole in the origin to
FB
COMP
V
REF
E/A
PWM
V
S
OUT
V
CC
C
OUT
ESR
L
G
PW0
G
LC
FB
COMP
V
REF
E/A
PWM
V
S
OUT
V
CC
C
OUT
ESR
L
G
PW0
G
LC
G
LC s
()
1
s
2
π f
zESR
⋅
--------------------------
+
1
s
2
π Qf
⋅
LC
⋅
----------------------------
s
2
π f
LC
⋅
-------------------
⎝⎠
⎛⎞ 2
++
-------------------------------------------------------------------------
=
f
LC
1
2
π
LC
OUT
⋅
1
ESR
R
OUT
---------------
+
⋅⋅
------------------------------------------------------------------------
=
f
zESR
1
2
π ESR C
OUT
⋅⋅
--------------------------------------------
=
,
Q
R
OUT
LC
OUT
R
OUT
ESR
+
()
⋅⋅
⋅
LC
OUT
R
OUT
ESR
⋅⋅
+
------------------------------------------------------------------------------------------
R
OUT
V
OUT
I
OUT
--------------
=
,
=



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