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參數(shù)資料
| 型號： | L6911E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 15/34頁 |
| 文件大小： | 558K |
| 代理商： | L6911E |
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Device description
L6911E
22/34
Equation 18
Where:
τ
1 = R4 × C20, τ2 = (R4+R3) × C20 and τd = Rd × C25.
The regulator transfer function became now:
Equation 19
Figure 10 on page 21 shows a method to select the regulator components (please note that
the frequencies fEC and fCC corresponds to the singularities introduced by additional
ceramic capacitors in parallel to the output main electrolytic capacitor).
●
To obtain a flat frequency response of the output impedance, the droop time constant
τ
d has to be equal to the inductor time constant (see the note at the end of the section):
Equation 20
●
To obtain a constant -20dB/dec Gloop(s) shape the singularity f1 and f2 are placed in
proximity of fCE and fLC respectively. This implies that:
Equation 21
●
To obtain a Gloop bandwidth of fC, results:
Equation 22
Rd
1
s
--- C25
Rd
1
s
---
+
C25
---------------------------------
R4
1
s
--- C20
+
R3
R4
1
s
--- C20
+
R3
+
-----------------------------------------------------
+
Rd 1
s
τ
1
τ
d
+
() s
2
R3
R
d
--------
τ
1
τ
d
+
+
1s
τ
2
+
() 1s τ
d
+
()
--------------------------------------------------------------------------------------------------
Rd
1s
R3
R
d
--------
τ
d
+
1
(
1s
τ
2
+
() 1 +
(
----------------------------------------------
=
Rs
()
1s
τ
2
+
() 1s τ
d
+
()
sC18 R
d
1s
R3
R
d
--------
τ
d
+
1s
τ
1
+
()
-------------------------------------------------------------------------------------------------------
≈
τ
d
R
d
C25
L
R
L
-------
τ
L
C25
L
R
L
R
d
()
-----------------------
==
=
f
2
f
1
----
f
LC
f
CE
--------
R4
R3
f
LC
f
CE
--------
1
–
==
f1
f
CE
C20
1
2
---
π R4 f
CE
=
=
f
LC
1f
C
G
0
A
0
R
0
VIN
Vosc
------------------
C20 // C25
C18
-----------------------------
f
C
f
LC
--------
C18
VIN
Vosc
------------------
C20 C25
C20
C25
+
-----------------------------
==
=
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