参数资料
型号: L6728TR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 1.5 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, DSO10
封装: 3 X 3 MM, LEAD FREE, DFN-10
文件页数: 8/31页
文件大小: 1361K
代理商: L6728TR
Obsolete
Product(s)
- Obsolete
Product(s)
Application details
L6728
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 are 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/ΔVOSC)
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
------------
ΔV
OSC
V
IN
-------------------
=
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