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L6728 Fiches technique(PDF) 16 Page - STMicroelectronics

No de pièce L6728
Description  Single phase PWM controller with PowerGOOD
PDF  32 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6728 Fiches technique(HTML) 16 Page - STMicroelectronics

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Application details
L6728
16/32
Figure 6.
Example of type III compensation.
●
Open loop converter singularities:
a)
b)
●
Compensation Network singularities frequencies:
a)
b)
c)
d)
To place the poles and zeroes of the compensation network, the following suggestions may
be followed:
a)
Set the gain RF/RFB in order to obtain the desired closed loop regulator bandwidth
according to the approximated formula (suggested values for RFB is in the range of
some k
Ω):
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
⋅⋅
-------------------------------
=
R
F
R
FB
----------
F
0dB
F
LC
------------
∆V
OSC
V
IN
-------------------
⋅
=



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