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L5987 Datasheet(PDF) 21 Page - STMicroelectronics

Part # L5987
Description  3 A step-down switching regulator
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5987 Datasheet(HTML) 21 Page - STMicroelectronics

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L5987 - L5987A
Application information
21/42
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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