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FAN5606 데이터시트 PDF




Fairchild Semiconductor에서 제조한 전자 부품 FAN5606은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 FAN5606 자료 제공

부품번호 FAN5606 기능
기능 Serial LED Driver
제조업체 Fairchild Semiconductor
로고 Fairchild Semiconductor 로고


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FAN5606 데이터시트, 핀배열, 회로
www.fairchildsemi.com
FAN5606
Serial LED Driver with Current-Regulated, Step-Up
DC/DC Converter
Features
• Drives Up to Six LEDs in Series
• Pulse Skip PWM Mode of Operation of the Boost Circuit
• Up to 90% Peak Efficiency
• No External Schottky Diode Required
• Up to 25mA Output
• Built-in DAC for Digital Brightness Control
• LED’s Current Can be Duty-Cycle-Modulated
• Digital, Analog, and PWM Brightness Control
• 2.7V to 5.5V Input Voltage Range
• 0.5MHz Operating Frequency (8MHz internal clock)
• Soft Start
• Low Shutdown Current: ICC < 1µA
• LED Short Circuit Protection
• Minimal External Components Needed
• Available in an 8-lead MLP Package
Applications
• Cell Phones
• Handheld Computers
• PDAs, DSCs, MP3 Players
• Keyboard Backlights
• LED Display
Description
The FAN5606 LED driver generates regulated output cur-
rents from a battery with input voltage varying between 2.7V
to 5V. An internal NMOS switch drives an external inductor,
and a Schottky diode delivers the inductor’s stored energy to
the load. Soft start circuitry prevents excessive current drawn
from the supply during power on. Any number of LEDs can
be connected in series as long as the summed forward volt-
ages do not lead to exceeding the specified operating output
voltage range.
In the FAN5606 device, the internal two-bit D/A converters
provide programmability of the output channel current.
Analog programming of the output current is also possible
in the FAN5606. To do this, ground the “B” pin and connect
a resistor between the “A” pin and a fixed supply voltage.
The output current can then be programmed to any desired
value within its specified range. The analog version uses a
single external resistor to set the current, and to turn the
device ON and OFF. The device is available in an 8-lead
MLP package.
Typical Applications
Analog Brightness Control
2.7V to 5.5V L = 6.8µH
CIN
VExternal
R
IND VOUT GINND
VIN CAT
AB
4.7µF
Digital Brightness Control
VOUT
2.7V to 5.5V L = 6.8µH
CIN
IND
VIN
DAC Inputs
A
GINND
CAT
B
4.7µF
VOUT
REV. 1.0.3 1/7/05




FAN5606 pdf, 반도체, 판매, 대치품
FAN5606
Block Diagram
V
IN
PRODUCT SPECIFICATION
OSC
V
OUT
DBB
COIL DRIVER
IND
B
DAC
A
START-UP
AMPLIFIER
LINEAR REGULA TOR
CAT
BG REF
POWER GOOD
GND
Circuit Description
When the input voltage is connected to VIN pin, the system is
turned on, the bandgap reference acquires its nominal volt-
age and the soft-start cycle begins. Once "power good" is
achieved (0.5mA in the diodes), the soft-start cycle stops and
the boost voltage increases to generate the desired current
selected by the input control pins.
The FAN5606 DC/DC converter automatically adjusts its
internal duty cycle to achieve high efficiency. If the output
external capacitor is shorted, the Schottky diode can be dam-
aged, therefore such a condition should be avoided.
LED Brightness Control
The inputs A and B can be digitally controlled LOW (GND)
and HIGH (VCC) signals. In analog mode, A input is con-
nected to an external stable voltage source via an external
resistor and B input is connected to ground. The current
flowing through the resistor is scaled by a factor of approxi-
mately 1000.
Digital Control
The FAN5606’s digital decoder allows selection of the fol-
lowing modes of operation: OFF, 5mA, 10mA, 20mA per
branch.
A0101
B0011
ILED OFF 5mA 10mA 20mA
Analog Control with PWM
In analog control mode, the LED current can go up to 25mA.
Input A is used to control the LED currents. Input B should
be connected to GND (logic level "0"). An external resistor
(R) is connected from A to a stable voltage source (VEXTER-
NAL) to control the LED current, ILED. The ILED is given by
the formula or the graph below:
ILED
=
-V----E---x---t--e--r--n--R-a---l--–-----V-----R---e---f
× Multiplication Ratio
4 REV. 1.0.3 1/7/05

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FAN5606 전자부품, 판매, 대치품
PRODUCT SPECIFICATION
FAN5606
Typical Performance Characteristics
TA = 25 °C, CIN = 47µF, COUT = 4.7µF, L = 6.8µH, unless otherwise noted.
Regulated LED Current vs Input Voltage
Efficiency vs Input Voltage
10.5
5.4
10.0
5.2
5.0 9.5
4.8 A=1, B=0 Scale1
A=0, B=1 Scale2
9.0
A=1, B=1 Scale3
4.6
8.5
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
20
19
18
17
16
15
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
2.5
2 x 20mA Load, L = 22µH
4 x 20mA Load, L = 6.8µH
3.0 3.5 4.0 4.5 5.0
Input Voltage (V)
5.5
Shutdown Current vs Input Voltage
0.065
0.060
0.055
0.050
0.045
0.040
0.035
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
REV. 1.0.3 1/7/05
7

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