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| 型号： | FAN5069MTCX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 16/22页 |
| 文件大小： | 622K |
| 描述： | IC REG DL BCK/LINEAR 16TSSOP |
| 产品变化通告： | Metallization Mask Rev 18/Apr/2007 |
| 标准包装： | 1 |
| 拓扑： | 降压（降压）同步（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 200kHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 控制器 |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -10°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | * |
| 包装： | 标准包装 |
| 产品目录页面： | 1221 (CN2011-ZH PDF) |
| 其它名称： | FAN5069MTCXDKR |
?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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