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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)： | 17/29頁 |
| 文件大小： | 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
17 of 29
NXP Semiconductors
AN10876
Buck converter for SSL applications
Example 1: At V
aux
= 14 V, I
cc
= 2 mA at 12 V,
2 = 46 %. V(R12) = 14
12
0.7 = 1.3 V,
I(R12) = 2 mA / 0.46 = 4.34 mA.
R12 = 1.3 V / 4.34 mA = 299
. Round down gives 270
.
P(R12) = I
2
R
2 = 2.4 mW.
Example 2: At V
aux
= 18 V, I
cc
= 2 mA at 12 V,
2 = 4 %. V(R12) = 18
12
0.7 = 5.3 V.
I(R12) = 2 mA / 0.04 = 50 mA.
R12 = 5.3 V / 50 mA = 106
. Rounding down gives 100
. P(R12) = 10 mW.
If the circuit is dimmable, a recalculation must be made representing a worst case
scenario. Some ICs, such as the SSL1523 and SSL2101, have internal HV generation. If
sufficient drain voltage is available, the IC is capable of providing its own supply. Note that
a smaller interval of current charge and a larger tolerance, leads to over-dimensioning of
this circuit and increases the losses in the serial resistor (R12), diode (D4) and inductor.
The margin might require additional protection against V
cc
overvoltage and to
accommodate this, a zener diode (D5) is included in the circuit.
4.7.1
Buffer capacitance C6 calculation:
When V
cc
is generated, the incoming current must be buffered to provide a continuous
and stable voltage. The voltage drop over C6 should be such that V
cc
does not drop below
the minimum voltage.
Equation 29
can be applied to determine the capacitor value:
(29)
Example: If
V = 1.3 V, I
cc
= 2 mA and
t = 6
s, then C6 will be at least 9.23 nF.
In practice, the value chosen for C6 is much higher to reduce noise and capacitive
coupling with the surroundings. Common values for C6 are between 1
F and 4.7
F.
Fig 6.
V
CC
generation circuit
019aaa872
U1
V
CC
GND
RC
REG
DRAIN
n.c.
SRC
AUX
C4
C5
LED
D3
D4
L3
R10
R12
T1
2
5
3
1
V
buf
C6
D5
1
2
3
4
8
7
6
5
C
6
I
-----------------
t
V
=
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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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