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參數資料
| 型號： | FAN5608 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | LED驅動器 |
| 英文描述： | Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
| 中文描述： | 串行/并行LED驅動電流調節，升壓型DC / DC轉換器 |
| 文件頁數： | 8/17頁 |
| 文件大小： | 206K |
| 代理商： | FAN5608 |
PRODUCT SPECIFICATION
FAN5608
8
REV. 1.0.3 6/28/04
Application Information
Inductor Selection
The inductor is one of the main components required by the
boost converter to store energy. The amount of energy stored
in the inductor and transferred to the load is controlled by the
regulator using PWM and pulse skipping techniques. In most
cases the FAN5608 operates the inductor in discontinuous
conduction mode.
To ensure proper operation of the current regulator over the
entire range of conditions, select the inductor based on the
maximum required power (P
OUT
) and the minimum input
voltage (V
IN
).
where units of L, V
IN
, and P
OUT
are in
μ
H, Volt, and Watt,
respectively and F = 0.4 is a factor depending upon the
FAN5608 architecture.
The above relation is applicable up to P
OUT
= 0.6W and
L = 4.3
μΗ ,
or greater. At lower inductor values the effi-
ciency decreases due to the resistive loss in the switching
Power FET. Using L = 4.3
μΗ
and increasing the load to 12
LED x 20mA (P
OUT
= 800mW) requires V
IN
> 3.5V to
maintain a constant 20mA current through LEDs. The induc-
tor L = 4.3
μ
H ensures proper operation for 2 x 4 white LEDs
with 20mA at 3.5V for V
IN
> 2.8V.
For any lighter load or higher V
IN
, the inductance can be
increased to improve the system efficiency. Application
examples are given in Figure 1 through Figure 4.
The peak current in the inductor is:
which gives the maximum rated current for the inductor. For
L = 4.3
μ
H, T
ON_Max
= 1.25
μ
S and V
IN_Max
= 4.2V, the
inductor saturation current should be at least 1A.
Capacitor Selection
Low ESR capacitors should be used to minimize the input
and output ripple voltage. Use of C
IN
= 4.7
μ
F/6.3V and
C
OUT
= 4.7
μ
F/25V type X5R/X7R multi layer ceramic
capacitor is recommended.
A larger value input capacitor placed as close as possible to
FAN5608 may be needed to reduce the input voltage ripple
in noise sensitive applications. An additional LC filter
between the battery and the FAN5608 input can help to
further reduce the battery ripple to the level required by a
particular application.
Schottky Diode Selection
The FAN5608HMPX and FAN56508MPX require the use of
an external Schottky diode. This diode should be rated at
200mA to 500mA average rectified current and 20V
maximum repetitive reverse voltage.
The MBR0520L (Fairchild) Schottky diode is
recommended.
Driving Higher Current LEDs
To increase the LED current range to 50mA, the CH1 and
CH2 outputs may be connected, as shown below:
L
V
OUT
(
-----P
)
2
F
×
<
I
T
-------------------------------------------------
V
×
L
=
Analog Brightness Control
A
1
A
2
V
IN
IND
IND
GND
CH1
C
IN
V
EXTERNAL
L = 4.7
μ
H
4.7
μ
F
2.7V to 5.5V
F
CH2
Digital Brightness Control
A
1
B
1
A
2
B
2
IND
IND
GND
CH1
C
IN
DAC Inputs
L = 4.7
μ
H
4.7
μ
F
2.7V to 5.5V
F
CH2
相關PDF資料 |
PDF描述 |
|---|---|
| FAN5608DHMPX | Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
| FAN5608HMPX | Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
| FAN5609 | LED Driver with Adaptive Charge Pump DC/DC Converter |
| FAN5609MPX | TERMINAL |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN5608_06 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
| FAN5608DHMPX | 功能描述:LED照明驅動器 LED Driver Serial/Parallel RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| FAN5608DMPX | 功能描述:LED照明驅動器 LED Driver Serial/Parallel RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| FAN5608DMPX_Q | 功能描述:LED照明驅動器 LED Driver Serial/Parallel RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| FAN5608HMPX | 功能描述:LED照明驅動器 LED Driver Serial/Parallel RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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