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L5987 Datasheet(PDF) 21 Page - STMicroelectronics

No. de pieza L5987
Descripción Electrónicos  3 A step-down switching regulator
PDF  42 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5987 Datasheet(HTML) 21 Page - STMicroelectronics

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L5987 - L5987A
Application information
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Figure 9.
The error amplifier, the PWM modulation and the LC output filter
The transfer function on the LC filter is given by:
Equation 17
where:
Equation 18
Equation 19
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.
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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