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FAN5613 Datasheet(PDF) 7 Page - Fairchild Semiconductor

No. de pieza FAN5613
Descripción Electrónicos  Low-Dropout LED Drivers for White, Blue or any Color LED
Download  12 Pages
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5613 Datasheet(HTML) 7 Page - Fairchild Semiconductor

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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 ISET. The LED current is controlled
by VCONTROL and RSET according to the formula:
For VCONTROL = 3V and a specified LED current, the RSET
value can be evaluated using the diagram shown in the Typi-
cal Performance Characteristics section. For any other
option, ISET value can be determined using the graph ISET
vs. VCTRL. 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.
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 Tj is the LED junction temperature, TA is the ambient
temperature,
ΘjA is the junction to ambient thermal resis-
tance, I is the LED current and VF is the LED forward
voltage.
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 VCATHODE, the higher the system efficiency.
Efficiency can be further improved using a higher VIN with
more LEDs as shown in example 3.
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 VF white or blue LEDs
directly from single cell Li-ion
When using white or blue low VF LEDs, and utilizing the
drivers low voltage drop, only 3.4V in VIN is needed for the
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.
–VDROP < 0.3V
–VF (at 20mA) < 3.1V (Low VF)
–VIN (at 20mA) =VDROP + VF = 3.4V
–VIN (at 5mA Typical) ~ 3.1V
Where VIN = 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 VF white or blue LEDs
from existing bus from 4.0V to 5.5V
High VF 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.
I
LED
200
V
CONTROL
V
CTRL
()
×
R
SET
=
T
j
T
A
Θ
jA
IV
F
×
×
+
=
Efficiency
V
IN
V
CATHODE
() V
IN
=
ISET
RSET
I1
I2
I3
I4
VIN
GND
FAN5613
CTRL
V
CONTROL
ENABLE
ON/OFF


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