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參數(shù)資料
| 型號(hào)： | FAN5612S7X |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | JT 9C 9#12 SKT RECP |
| 中文描述： | LED DISPLAY DRIVER, PDSO6 |
| 封裝： | SC-88A, SC-70, 6 PIN |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 168K |
| 代理商： | FAN5612S7X |
PRODUCT SPECIFICATION
FAN5611/FAN5612/FAN5613/FAN5614
REV. 1.0.4 6/4/04
7
Application Information
Setting the LED Current
The current flowing into LEDs is approximately 200 times
greater then the current I
SET
. The LED current is controlled
by V
CONTROL
and R
SET
according to the formula:
For V
value can be evaluated using the diagram shown in the Typi-
cal Performance Characteristics section. For any other
option, I
SET
value can be determined using the graph I
vs. V
CTRL
. The LED’s brightness can also be adjusted by
driving ENABLE or the CTRL pin with a PWM signal. The
driving signal frequency should be greater than 100Hz to
avoid flickering, increasing to more than 1MHz, if necessary.
CONTROL
= 3V and a specified LED current, the R
SET
SET
LEDs are very sensitive to temperature. In most cases the
maximum allowed junction temperature is 100°C. This tem-
perature is the result of adding to the ambient temperature
the over temperature due to power dissipation, is described
by as follows:
where T
temperature,
tance, I is the LED current and V
voltage.
j
is the LED junction temperature, T
Θ
jA
is the junction to ambient thermal resis-
F
A
is the ambient
is the LED forward
The FAN5611 to FAN5614 are designed to reduce the
current through LEDs, when the temperature rises and the
cathode voltage increases, as can be seen from typical the
"LED Current vs. LED Cathode Voltage" graph under the
Typical Performance Characteristics section.
Efficiency Considerations
The FAN561X driver’s low dropout architecture can signifi-
cantly improve the efficiency compared to using simple
ballast resistors. The system efficiency, defined as the ratio
between the LEDs power and the input supplied power can
be calculated as follows:
The lower the V
Efficiency can be further improved using a higher V
more LEDs as shown in example 3.
CATHODE
, the higher the system efficiency.
IN
with
Application Notes
The ultra-low voltage drop across the FAN561X series of
LED drivers, allow the devices to drive white, blue, and
other color LEDs in a wide range of input voltages. The
driver can be used in many applications. Although, only
the FAN5613 is shown in all three examples, any of
the FAN561X series of LED drivers can be used in the
applications presented in this document, due to their
similar operation.
Example 1: Drive low V
directly from single cell Li-ion
When using white or blue low V
drivers low voltage drop, only 3.4V in V
full 20mA LED current. At 3.1V, there is still 5mA typical
current available for the LEDs. The single cell Li-ion is
utilized in most applications like cell phones or digital still
cameras. In most cases, the Li-ion battery voltage level only
goes down to 3.0V voltage level, and not down to the full
discharge level (2.7V) before requesting the charger.
F
white or blue LEDs
F
LEDs, and utilizing the
IN
is needed for the
– V
– V
– V
– V
DROP
F (at 20mA)
IN (at 20mA)
IN (at 5mA Typical)
< 0.3V
< 3.1V (Low V
=V
DROP
~ 3.1V
F
= 3.4V
)
+ V
F
Where V
IN
= Single cell Li-ion Voltage
Key advantages:
No boost circuit needed for the LCD or keyboard
backlight
Drivers directly connected to a Li-ion battery
No EMI, no switching noise, no boost efficiency lost, no
capacitor, and no inductor.
Example 2: Drive high V
from existing bus from 4.0V to 5.5V
High V
F
white or blue LEDs have forward voltage drop in
the range of 3.2V to 4.0V. To drive these LEDs with the
maximum current of 20mA for maximum brightness, usually
requires a boost circuit for a single cell Li-ion voltage range.
F
white or blue LEDs
I
LED
200
V
CONTROL
V
CTRL
–
(
)
×
R
SET
=
T
j
T
A
Θ
jA
I
V
F
×
×
+
=
Efficiency
V
IN
V
CATHODE
–
(
)
V
IN
=
I
SET
R
SET
I1
I2
I3
I4
V
IN
GND
FAN5613
CTRL
V
CONTROL
ENABLE ON/OFF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FAN5613 | Low-Dropout LED Drivers for White, Blue or any Color LED |
| FAN5613MPX | Low-Dropout LED Drivers for White, Blue or any Color LED |
| FAN5614 | Low-Dropout LED Drivers for White, Blue or any Color LED |
| FAN5614S7X | Low-Dropout LED Drivers for White, Blue or any Color LED |
| FAN5631 | Regulated Step-Down Charge Pump DC/DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5613 | 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 |
| FAN5613MPX | 功能描述:LED照明驅(qū)動(dòng)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 |
| FAN5613MPX_Q | 功能描述:LED照明驅(qū)動(dòng)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 |
| FAN5614 | 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 |
| FAN5614S7X | 功能描述:LED照明驅(qū)動(dòng)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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