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參數(shù)資料
| 型號(hào)： | L6727TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Single phase PWM controller |
| 中文描述： | 單相PWM控制器 |
| 文件頁(yè)數(shù)： | 16/22頁(yè) |
| 文件大?。?/td> | 318K |
| 代理商： | L6727TR |
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Application details
L6727
16/22
Compensation goal is to close the control loop assuring high DC regulation accuracy, good
dynamic performances and stability. To achieve this, the overall loop needs high DC gain,
high bandwidth and good phase margin.
High DC gain is achieved giving an integrator shape to compensation network transfer
function. Loop bandwidth (F
0dB
) can be fixed choosing the right R
F
/R
FB
ratio, however, for
stability, it should not exceed F
SW
/2
π
. To achieve a good phase margin, the control loop gain
has to cross 0dB axis with -20dB/decade slope.
As an example,
Figure 7
shows an asymptotic bode plot of a type III compensation.
Figure 7.
Example of type III compensation.
●
Open loop converter singularities:
a)
b)
●
Compensation Network singularities frequencies:
a)
b)
c)
d)
Gain
[dB]
Log (Freq)
0dB
open loop
EA gain
closed
loop gain
compensation
gain
open loop
converter gain
F
LC
F
ESR
F
Z1
F
Z2
F
P1
F
P2
20log (R
F
/R
FB
)
20log (V
IN
/
V
OSC
)
F
0dB
F
LC
2
π
L C
OUT
---------------------------------
=
F
ESR
2
π
C
OUT
ESR
-------------------------------------------
=
F
Z1
2
π
R
F
C
F
------------------------------
=
F
Z2
+
2
R
FB
R
S
C
S
----------------------------------------------------
=
F
P1
2
π
R
F
P
C
F
+
C
P
--------------------
--------------------------------------------------
=
F
P2
2
π
R
S
C
S
------------------------------
=
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