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參數(shù)資料
| 型號(hào)： | AND8099 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 5.0 V, 2.0 A Flyback Converter |
| 中文描述： | 5.0五，2.0反激式轉(zhuǎn)換器 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 219K |
| 代理商： | AND8099 |
AND8099/D
http://onsemi.com
4
Feedback Loop
The feedback loop is composed of an optocoupler, a shunt
regulator, a compensation capacitor and a resistor divider.
The optocoupler isolates the AC input from the DC output.
As a shunt regulator, the ON Semiconductor TL431 is used
to regulate the output voltage. This monolithic voltage
reference is programmable from V
ref
to 36 V using two
external resistors. It exhibits a wide current range of 1.0 mA
to 100 mA and is an excellent replacement for Zener diodes.
The reference voltage of the TL431 is set at 2.5 V, for a 5.0 V
output voltage, by a resistor divider R5 and R6 (low
tolerance, 2.0 k resistors). The TL431 monitors the 5.0 V
output voltage and compares the divided down voltage to its
2.5 V internal reference. A small increase in the output
voltage will cause the shunt regulator to start conducting,
thus sinking current through the optocoupler’s LED. In turn,
the optocoupler transistor becomes forward biased and starts
driving current into the control input pin of the NCP1055.
The power switch duty cycle is then adjusted accordingly. A
compensation capacitor C10 of 0.1 F is placed between the
cathode and the reference pin of the TL431 for improved
stability. The resistor R3 limits the current going through the
optocoupler to a safe level and prevents damage to the
optocoupler.
+
+
+
+
+
C11
330
R6
2.0 k
R5
2.0 k
C10
0.1
R3
47
R4
1.0 k
V
i
F1
2.0 A
C1
0.1
1
L1
10 mH
D1
D2
D3
D4
R1
91 k
+
C2
33
C3
220 p
C4
47 p
R2
2.2 k
D5
2
3
4
8
7
6
5
D6
T1
C7
330
C8
330
C9
330
C6
100 p
C5
10
+
IC2
IC3
5.0 V, 2.0 A
C12
1.0
Figure 1. Circuit Diagram
NCP1055P100
X
C13
1n
L2
5.0 H
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AND8099/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:5.0 V, 2.0 A Flyback Converter |
| AND8104/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MicroIntegration Technology Solutions for Protection in High Speed I/O Data Lines |
| AND8109 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:LED CONSTANT CURRENT SOURCE SCHEME |
| AND8112 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:A Quasi-Resonant SPICE Model Eases Feedback Loop Designs |
| AND8116 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Integrated Relay/Inductive Load Drivers for Industrial and Automotive Applications |
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