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| 型號： | 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)： | 15/29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
15 of 29
NXP Semiconductors
AN10876
Buck converter for SSL applications
Example: For core type RM8 3H3-A630 - if N
L3
= 24, I
p
= 1.48 A, u
e
= 342 and
L
e
= 35.6 mm, B
max
is calculated as follows:
(26)
4.6.3
Auxiliary winding count
The auxiliary winding can be used for two purposes. It can sense demagnetization of the
inductor and also generate the required voltage to power the controller. If the winding is
used for demagnetization only, the voltage generated can be much smaller than when
using the winding to supply the V
cc
. This affects the winding ratio. For demagnetization
detection, both the negative and positive voltage should be larger than the threshold level.
For V
cc
generation using a single diode rectifier, it is most efficient to take the longest time
of
1 and
2 and dimension the winding accordingly. For interval
2,
Equation 27
applies:
(27)
Example: If V
o(min)
= 100 V, N
L3
= 24 and V
aux
= 14 V, then N
aux
= 3.36 (rounded up to the
closest higher integer, in this case 4)
Note that the voltage on the auxiliary winding should always be higher than the minimum
V
cc
voltage as required by the IC. There is voltage loss over the inductor and the rectifier
diode, and there is ripple on the V
cc
due to discharge. All these factors have to be taken
into account. There is a direct relationship between the voltage on the auxiliary winding
and the converter output voltage. The output voltage depends on the sum of the forward
voltages of the attached LED's. Consequently, the minimum V
f
should be taken as the
starting point for checking if sufficient voltage is available on the auxiliary winding.
4.6.4
Wire diameter selection
Wire diameter selection is a trade-off between the available winding area, resistive losses,
proximity losses and skin losses. When using wire sizes below 0.6 mm diameter at
operating frequencies below 200 kHz, the skin losses are normally negligible. Above
0.6 mm diameter, it is recommended that Litze wire, or multiple strands, are used. Skin
depth can be calculated using
Equation 28
:
(28)
In which: u
o
= 0.4
10
6
,
= resistivity = 17 X 10
9
(copper). U
r
(copper) = 1.
Example: At 100 kHz sinusoidal current, using copper, the skin depth will be 0.21 mm.
The effective frequency does not correspond to the converter frequency, but to the
harmonics of the applied waveform. For a triangular wave current, the amplitude and
frequency of the waveforms can be deducted using Fourier analyses. The amplitude of
the coefficients depends on the ratio between
1 and
2. as can be seen in
Table 4
.
B
max
342
24
35.6
---------
341
mT
=
=
V
aux
N
N
L3
----------
V
o min
=
N
aux
V
V
o min
--------------------------
=
f
eff
2
u
r
u
o
------------------------------------------------
=
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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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