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參數(shù)資料
| 型號： | SC4809B |
| 廠商： | Semtech Corporation |
| 英文描述： | High Performance Current Mode PWM Controller |
| 中文描述： | 高性能電流模式PWM控制器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 328K |
| 代理商： | SC4809B |
8
2005 Semtech Corp.
www.semtech.com
SC4809A/B/C
POWER MANAGEMENT
Application Information
The flyback power stage is very popular in 48V input
telecom applications for output power levels up to
approximately 50 watts. The exact power rating of the
flyback power stage, of course, is dependent on the input
voltage/output voltage combination, its operating
environment and many other factors. Additional output
voltages can be generated easily by simply adding another
winding to the coupled inductor along with an output
diode and output capacitor. Obtaining multiple output
voltages from a single power stage is another advantage
of the flyback power stage.
A simplified schematic of the flyback power stage with a
drive circuit block included is shown in Figure 1. In the
schematic shown, the secondary winding of the coupled
inductor is connected to produce output voltage. The
power switch, Q1, is an N-channel MOSFET. The
secondary inductance, L
and capacitor C, make up the
output filter, The resistor R, represents the load seen by
the power supply output.
Figure 1: Flyback Power Converter
The important waveforms of the flyback power stage
operating in DCM are shown in Figure 2.
Figure 2: Discontinuous Mode Flyback Waveforms
The simplified voltage conversion relationship for the
flyback power stage operating in CCM is given by:
D
1
D
N
N
V
V
P
S
I
O
=
The simplified voltage conversion relationship for the
flyback power stage operating in DCM is given by:
K
D
N
N
V
V
P
S
I
O
=
Where K is defined as:
S
SEC
T
R
L
2
K
=
相關(guān)PDF資料 |
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| SC4809C | High Performance Current Mode PWM Controller |
| SC480 | Complete DDR1/2/3 Memory Power Supply |
| SC480EVB | Complete DDR1/2/3 Memory Power Supply |
| SC480IMLTRT | Complete DDR1/2/3 Memory Power Supply |
| SC4810B | High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC4809C | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Current Mode PWM Controller |
| SC4809CIMSTRT | 制造商:Semtech Corporation 功能描述:SC Series 25 mA 1100 kHz High Performance Current Mode PWM Controller - MSOP-10 |
| SC480EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Complete DDR1/2/3 Memory Power Supply |
| SC480IMLTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Complete DDR1/2/3 Memory Power Supply |
| SC4810B | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay |
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