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參數(shù)資料
型號(hào): FAN5069EMTCX
廠商: Fairchild Semiconductor
文件頁(yè)數(shù): 16/22頁(yè)
文件大小: 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(kāi)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)
?2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5069 Rev. 1.1.5
16
FAN5069 has a high gain error amplifier around which
the loop is closed. Figure 24 shows a Type-3 compensa-
tion network. For Type-2 compensation, R3 and C3 are
not used. Since the FAN5069 architecture employs sum-
ming current mode, Type-2 compensation can be used
for most applications.
For further information about Type-2 compensation
networks, refer to:
?SPAN class="pst FAN5069EMTCX_2464147_4">  Venable, H. Dean, "The K factor: A new mathematical 
tool for stability analysis and synthesis, Proceedings
of Powercon, March 1983.
Note: For critical applications requiring wide loop 
bandwidth using very low ESR output capacitors,
use Type-3 compensation.
Type 3 Feedback Component Calculations
Use the following steps to calculate feedback components:
Notation:
Equations:
Effective current sense resistance = 
 (EQ. 19)
Current modulator DC gain = 
 (EQ. 20)
Effective ramp amplitude =
 (EQ. 21)
Voltage modulator DC gain = 
 (EQ. 22)
Plant DC gain = 
 (EQ. 23)
Sampling gain natural frequency = 
 (EQ. 24)
Sampling gain quality factor (damping) = 
 (EQ. 25)
Effective inductance = 
 (EQ. 26)
 (EQ. 27)
C
0
Net Output Filter capacitance
=
G
p
s
(  )    Net Gain of Plant = control-to-output transfer function
=
L
Inductor Value
=
R
DSON
ON-state Drain-to Source Resistance of Low-side MOSFET
=
R
es
Net ESR of the Output Filter Capacitors
=
R
L
Load Resistance
=
T
s
Switching Period
=
V
IN
Input Voltage
=
F
SW
Switching Frequency
=
R
i
7   R
DSON
?/DIV>
=
M
i
R
L
R
i
------ -
=
V
m
3.33   10
10
V
IN
1.8

(
)   T
s
?/DIV>
R
ramp
------ ----------------- ------------------
?/DIV>
?/DIV>
=
M
v
V
IN
V
m
-------- -
=
M
o
M
v
M
i
||
M
v
M
i
?/DIV>
M
v
M
i
+
---------- --------- -
=
=
?/DIV>
n
?/DIV>
T
s
----- -
=
Q
z
2

?/DIV>
----- -
=
L
e
M
O
M
v
------- -
L
M
v
R
i
?/DIV>
?/DIV>
n
Q
z
?/DIV>
----------------- -- -
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
R
p
M
v
R
i
R
L
?/DIV>
?/DIV>
M
v
R
i
R
L
+
?/DIV>
-------------- ----------------- - -
M
v
R
i
?/DIV>
(
)   R
L
||
=
=
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