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| 型號(hào)： | FAN5069EMTCX |
| 廠商： | Fairchild Semiconductor |
| 文件頁(yè)數(shù)： | 17/22頁(yè) |
| 文件大?。?/td> | 622K |
| 描述： | IC REG DL BCK/LINEAR 16TSSOP |
| 產(chǎn)品變化通告： | Metallization Mask Rev 18/Apr/2007 |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 拓?fù)洌?/td> | 降壓（降壓）同步（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 2 |
| 頻率 - 開關(guān)： | 200kHz |
| 電壓/電流 - 輸出 1： | 控制器 |
| 電壓/電流 - 輸出 2： | 控制器 |
| 帶 LED 驅(qū)動(dòng)器： | 無(wú) |
| 帶監(jiān)控器： | 無(wú) |
| 帶序列發(fā)生器： | 無(wú) |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | * |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | * |
| 包裝： | 帶卷 (TR) |
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?2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5069 Rev. 1.1.5
17
Poles and Zeros of Plant Transfer Function:
Plant zero frequency =
(EQ. 28)
Plant 1
st
pole frequency =
(EQ. 29)
Plant 2
nd
pole frequency =
(EQ. 30)
Plant 3
rd
pole frequency =
(EQ. 31)
Plant gain (magnitude) response:
(EQ. 32)
Plant phase response:
(EQ. 33)
Choose R1, R
BIAS
to set the output voltage using EQ.6. Choose the zero crossover frequency F
cross
of the overall
loop. Typically F
cross
should be less than fifth of F
sw
. Choose the desired phase margin; typically between 60?to 90?
Calculate plant gain at F
cross
using EQ.34 by substituting F
cross
in place of f. The gain that the amplifier needs to pro-
vide to get the required crossover is given by:
(EQ. 34)
The phase boost required is calculated as given in (EQ. 35)
(EQ. 35)
where M is the desired phase margin in degrees.
The feedback component values are calculated as given in equations below:
(EQ. 36)
(EQ. 37)
(EQ. 38)
(EQ. 39)
(EQ. 40)
(EQ. 41)
f
z
1
2 ?nbsp C
o
R
es
?/DIV>
?/DIV>
?/DIV>
-------------- ----------------- ---------- -
=
f
p1
1
2 ?nbsp C
o
R
p
L
e
R
L
------ -
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
- ----------------- ----------------- ----------------- ------ -
=
f
p2
1
2 ?/DIV>
?/DIV>
- ---------- -
1
C
o
R
L
?/DIV>
----------------- -- -
R
p
L
e
------ -
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
f
p3
?/DIV>
n
2
L
e
?/DIV>
2 ?nbsp R
p
?/DIV>
?/DIV>
- ----------------- ------- -
=
G
p
(f)
20
M
0
log
10
1
f
f
z
--- -
?nbsp ?/DIV>
?nbsp ?/DIV>
2
+
1
f
f
p1
------ -
?nbsp ?/DIV>
?nbsp ?/DIV>
2
+
1
f
f
p2
------ -
?nbsp ?/DIV>
?nbsp ?/DIV>
2
+
1
f
f
p3
-- ---- -
?nbsp ?/DIV>
?nbsp ?/DIV>
2
+
?/DIV>
?/DIV>
------------ ----------------- ----------------- ----------------- ----------------- ----------------- -------- -
log
?/DIV>
+
?/DIV>
=
G
P
(f)
tan
1
f
f
z
--- -
?nbsp ?/DIV>
?nbsp ?/DIV>
tan
1
f
f
p1
------ -
?nbsp ?/DIV>
?nbsp ?/DIV>
tan
1
f
f
p2
------ -
?nbsp ?/DIV>
?nbsp ?/DIV>
tan
1
f
f
p3
------ -
?nbsp ?/DIV>
?nbsp ?/DIV>
=
G
AMP
1
G
p
(F
cross
)
-------------- ----------------- -
=
Phase Boost M
G
P
(F
cross
)
90?/DIV>
=
K
Tan
Boost
4
--------------- -
?/DIV>
?/DIV>
?/DIV>
?/DIV>
45
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
2
=
C2
1
2 ?nbsp F
cross
G
AMP
R1
?/DIV>
?/DIV>
?/DIV>
?/DIV>
------------ ----------------- ----------------- ----------------- -------- -
=
C1
C2 K 1
(
)
?/DIV>
=
C3
1
2 ?nbsp F
cross
K
?/DIV>
?/DIV>
?/DIV>
R3
?/DIV>
---- ----------------- ----------------- ----------------- -------- -
=
R2
K
2 ?nbsp F
cross
?/DIV>
?/DIV>
C1
?/DIV>
-------- ----------------- ----------------- ------- -
=
R3
R1
K 1
(
)
---------- ------- -
=
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