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AN938 Datasheet(PDF) 23 Page - STMicroelectronics

Part # AN938
Description  The L4973 family is a 3.5 A monolithic DC-DC converter
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN938 Datasheet(HTML) 23 Page - STMicroelectronics

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AN938
Typical application
Doc ID 5410 Rev 10
23/33
3.9
PWM gain
Equation 15
where Vct is the peak-to-peak sawtooth oscillator.
Pole and zero values are as follows:
Equation 16
Equation 17
Equation 18
Equation 19
Equation 20
The compensation is found by choosing Focomp close to the frequency of the double pole
introduced by the LC filter.
Using a compensation network with R1 = 15 k
Ω, C6 = 22 nF and C5 = 150 pF, the gain and
phase bode plots are shown in Figure 32-34. The cutoff frequency Fc is 22 KHz and the
phase margin is 52°C.
V
CC
V
ct
-----------
V
CC
6
⋅
V
CC
1
–
--------------------
6
≈
=
F
o
1
2
πR
esr
C
out
⋅
⋅
---------------------------------------
1
2
π 0.065 300 10
6
–
⋅⋅
⋅
⋅
-------------------------------------------------------------
8.162KHz
==
=
F
p
1
2
π
LC
out
⋅
⋅⋅
---------------------------------------
1
2
π
68 10
6
–
300 10
6
–
⋅⋅
⋅
⋅⋅
--------------------------------------------------------------------------
1.087kHz
==
=
F
ocomp
1
2
π R
c
C
c
⋅⋅
⋅
---------------------------------
1
2
π 15 10
3
22 10
9
–
⋅⋅
⋅
⋅
⋅
----------------------------------------------------------------
492Hz
==
=
F
p1
1
2
π R
o
C
c
⋅⋅
⋅
----------------------------------
1
2
π 1.2 10
6
22 10
9
–
⋅⋅
⋅
⋅
⋅
-----------------------------------------------------------------
6.029Hz
==
=
F
p2
1
2
π R
c
C
o
⋅⋅
⋅
----------------------------------
1
2
π 15 10
3
150 10
12
–
⋅⋅
⋅
⋅
⋅
---------------------------------------------------------------------
70KHz
==
=



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