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FAN5612 데이터시트 PDF




Fairchild Semiconductor에서 제조한 전자 부품 FAN5612은 전자 산업 및 응용 분야에서
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부품번호 FAN5612 기능
기능 Low-Dropout LED Drivers for White/ Blue or any Color LED
제조업체 Fairchild Semiconductor
로고 Fairchild Semiconductor 로고


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FAN5612 데이터시트, 핀배열, 회로
www.fairchildsemi.com
FAN5611/FAN5612/FAN5613/FAN5614
Low-Dropout LED Drivers for White, Blue or any
Color LED
Features
• LED Drivers for parallel-connected LEDs
• Ultra-low voltage drop (< 300mV) to support direct
Li-ion applications
• No EMI, no switching noise
• No external components needed for current matching
• Both analog and PWM brightness control
• FAN5611, FAN5613 feature up to 160mA bias current
(up to 40mA for each LED)
• FAN5612 features up to 120mA bias current (up to 40mA
for each LED)
• FAN5614 features up to 160mA bias current (up to 80mA
for each LED)
• Enable/Shutdown control (FAN5612, FAN5613,
FAN5614)
• Shutdown current < 1µA
• Small footprint SC-70 and 2x2 MLP
Applications
• Cell Phones
• PDA, DSC, MP3 Players
• Handheld Computers
• LCD Display Modules
• Keyboard Backlight
• LED Displays
General Description
The FAN5611/FAN5612/FAN5613/FAN5614 driver family
provides matched current source bias for white, blue or any
color LEDs. The current in the LEDs can be programmed by
an external resistor. The individual LED currents are 200 x
ISET, where ISET is the current through the external resistor
connected to the CTRL pin. The FAN5611 and the FAN5613
are capable of driving four LEDs, while the FAN5612 can
drive three LEDs. The FAN5614 is designated to drive two
high current LEDs. In any case, at least I1 should be always
connected to an LED in order to have the other LEDs driven
with a matched current to I1.
The FAN5612, FAN5613 and FAN5614 have Enable pin.
When these devices are disabled, the supply current drops to
less than 1µA.
The FAN5611, FAN5612 and FAN5614 drivers are available
in a 6-lead SC-70 package. The FAN5613 is available in an
8-lead MLP package.
Typical Applications
VIN
VIN
VIN
ISET
VCONTROL (3V)
RSET
I4
CTRL
I3 I2
FAN5611
GND
I1
ISET
VCONTROL (3V)
RSET
ENABLE
I3 I2
CTRL FAN5612
ON/OFF
GND
I1
ISET
VCONTROL (3V)
RSET
ENABLE
I4
CTRL
I3
I2
FAN5613
ON/OFF
GND
I1
Four Diode Control
Three Diode Control with ON/OFF
Four Diode Control With ON/OFF
VIN
ISET
VCONTROL (3V)
RSET
ENABLE
I1/I2 I3/I4
CTRL FAN5614
ON/OFF
GND
Two Diode Control with ON/OFF
REV. 1.0.4 6/4/04




FAN5612 pdf, 반도체, 판매, 대치품
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
DC Electrical Characteristics (VIN = 3.3V to 5.5V, ENABLE = VIN, TA = 25°C Unless otherwise noted)
Parameter
Output Current
Multiplication Ratio
FAN5611/12/13
Conditions
ISET = 100µA
VSAT = 300mV
Min.
140
Typ.
200
Max.
260
Units
FAN5614
ISET = 100µA
VSAT = 150mV
LED Current (Per Diode) FAN5611/12/13 VSAT = 300mV
ISET = 100µA
20
mA
FAN5614
VSAT = 150mV
ISET = 100µA
LED to LED Current
Matching
FAN5611/12/13
VSAT = 300mV
ISET = 100µA
TA = -40°C to
85°C
-3
3%
FAN5614
VSAT = 150mV
ISET = 100µA
TA = -40°C to
85°C
Peak Efficiency
VIN = 3V
90
%
Current in OFF Mode (ISET and II)
Min. ENABLE “ON Voltage” (Note3)
(FAN5612, FAN5613, FAN5614)
Max. ENABLE “OFF Voltage” (Note3)
(FAN5612, FAN5613 FAN5614)
VEN = 0V
ISET = 150µA
0.5
1 µA
3V
V
Notes:
3. ENABLE “ON” is VEN for which II1>20mA @ VI1=0.3V, while ENABLE “OFF” is VEN for which II1<1µA @ VI1>0.3V
4 REV. 1.0.4 6/4/04

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FAN5612 전자부품, 판매, 대치품
PRODUCT SPECIFICATION
FAN5611/FAN5612/FAN5613/FAN5614
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:
ILED = 200 × (VCONTROL VCTRL) ⁄ RSET
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:
Tj = TA + ΘjA × I × VF
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:
Efficiency = (VIN VCATHODE) ⁄ VIN
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.
VIN
VCONTROL
ISET
RSET
ENABLE
I4
CTRL
I3 I2
FAN5613
ON/OFF
GND
I1
– 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.
REV. 1.0.4 6/4/04
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