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參數(shù)資料
| 型號： | FAN5610MPX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | LED Driver for White, Blue or any Color LED |
| 中文描述： | LED DISPLAY DRIVER, DSO8 |
| 封裝： | 3 X 3 MM, MO-229VEEC, MLP-8 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 105K |
| 代理商： | FAN5610MPX |
PRODUCT SPECIFICATION
FAN5610
REV. 1.0.2 10/28/03
7
Digital Control with PWM
(Continued)
A and B are PWM.
I
LED
(Average) =
δ
x 21mA where
δ
is Duty Cycle. (Note 6)
Note:
6. Proportionally select the duty cycle to achieve the desired value of typical LED current between 1mA to 20mA.
B Input (PWM)
A Input (PWM)
s
s
s
0mA
OFF
ILED
I
LED
(Average)
= 0.3 x 21mA = 6.3mA
I
LED
(Average)
= 0.7 x 21mA = 14.7mA
1KHz
D 30%
D 30%
1KHz
D 70%
D 70%
Application Information
As seen in the block diagram, the FAN5610 includes four
independent current regulators able to maintain a program-
mable constant current through LEDs, regardless of their for-
ward voltage. This is true over a wide range of input
voltage starting from V
F_max
+ 0.35V, where V
highest forward voltage among the LEDs driven by
FAN5610. The independence of current (LED current
changes less than 1%) with change in V
V
IN
> V
F (MAX)
+ 0.35V, is shown in the graph below.
F_max
is the
IN
and V
F
for
Program the LED’s brightness by applying a continuous
voltage level or a PWM signal at the inputs of the built-in
digital to
a
nalog converter (DAC). When a PWM signal is
utilized to drive the DAC inputs, the current through the
LEDs is switched between two levels with the PWM signal
frequency. Consequently, the average current changes with
the duty cycle. The LED current waveform tracks the PWM
signal, so the LEDs brightness depends on the duty cycle.
For white LEDs the spectral composition is optimal at a
current level specified by the manufacturer. The DAC inputs
should be programmed to set the current required to achieve
white LED spectrum and PWM used for dimming. To main-
tain the "purest" white, the current through the LEDs should
be switched between zero and a specified current level
(usually around 20mA) corresponding to the white light
chromaticity coordinate.
Conversion errors are minimized and the best LED to LED
matching is achieved over the entire range of average current
settings, when PWM brightness control is used to modulate
the LED current between zero and the maximum value
(A=1, B=1).
Input Voltage (V)
L
0
2.5
5
3.0
3.5
4.0
4.5
5.0
5.5
10
15
20
25
Current Regulation Performance
V
F2
=3.6V
V
F1
= 3.3V
V
IN
> V
F (MAX)
+ 0.3 5V
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| FAN5611 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low-Dropout LED Drivers for White, Blue, or any Color LED |
| FAN5611_06 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low-Dropout LED Drivers for White, Blue, or any Color LED |
| FAN5611A WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5611MPX | 功能描述:LED照明驅(qū)動器 LED Dvr LDO any Color LED 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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| FAN5611S7X | 功能描述:LED照明驅(qū)動器 LDO LED Driver all Colors 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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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