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| 型號(hào)： | SSL2102 |
| 廠商： | NXP Semiconductors N.V. |
| 中文描述： | Demoboard description SSL2102 12W-230V Triac dimmable fly-back demonstration board The SSL2102 is a Switched Mode Power Supply (SMPS) controller IC that operates in combination with a phase cut dimmer directly from rectified mains. It is designed to drive LED devices. Our SSL2102 demonstration boards are suitable for 120 V or 230 V mains. |
| 文件頁數(shù)： | 5/29頁 |
| 文件大?。?/td> | 797K |
| 代理商： | SSL2102 |
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AN10876
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Application note
Rev. 2 — 23 June 2011
5 of 29
NXP Semiconductors
AN10876
Buck converter for SSL applications
3. Theory of operation
The operation of the buck converter is relatively simple, comprising an inductor and two
switches that control the inductor input current. It alternates between connecting the
inductor to source voltage to store energy in the inductor, and discharging the inductor into
the load.
Figure 1
shows a simplified application diagram of a buck converter connected to a
voltage supply and a load. For a basic understanding of the application, V
I
and V
o
can be
regarded as DC. In a practical application, a MOSFET or bipolar transistor replaces switch
S1, and a diode replaces switch S2.
The circuit is defined by the state of the switches. With two switches there are four modes,
but not all of them are applicable. Modes 1 and 2 are the most important and nearly
always present, while mode 3 is only present in Discontinuous Conduction Mode (DCM).
Mode 4 must be prevented, since this would short circuit the supply. The state of the
switches in modes 1 to 3 is displayed in
Table 1
.
Table 1.
Mode
1
2
3
The operation of the buck-back converter is briefly explained on the next page. The
figures show the equivalent circuit diagrams for the first two modes. Simplified waveforms
are also shown for one complete switching cycle.
Fig 1.
Basic configuration circuit
Possible modes of operation
S1
On
Off
Off
S2
Off
On
Off
Duration
1
t
total
2
t
total
3
t
total
019aaa865
LOAD
supply
S2
S1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SSL2102DB/17W120V,598 | 功能描述:LED 照明開發(fā)工具 17W 120V dimmable LED Drvr RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| SSL2102T/DB/FLYB120V,598 | 功能描述:LED 照明開發(fā)工具 SSL Mains Dimmable LED Driver Demo RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| SSL2102T/DB/FLYB120V598 | 制造商:NXP Semiconductors 功能描述:IC LED DRVR SOP-20 |
| SSL2102T/DB/FLYB230V,598 | 功能描述:LED 照明開發(fā)工具 SSL Mains Dimmable LED Driver Demo RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| SSL2102T/DB/FLYB230V598 | 制造商:NXP Semiconductors 功能描述:IC LED DRVR SOP-20 |
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