FAN5608

更新时间： 2024-10-31 22:50:59

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		转换器驱动
页数	文件大小	规格书
17页	207K
描述
Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter

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FAN5608 数据手册

www.fairchildsemi.com

FAN5608

Serial/Parallel LED Driver with Current-Regulated,

Step-Up DC/DC Converter

Features

Description

• Two Independent Channels Drive up to Six LEDs per

Channel

• Adaptive Output Voltage Drive to Maximize Efﬁciency

• PWM/PFM Mode of Operation of the Boost Circuit

• Up to 85% Efﬁciency

• Up to 2 × 20mA Output

• Two Built-in DACs for Independent (Digital) Brightness

Control for Both Channels

• LED’s Current Can be Duty-Cycle-Modulated between

0 to 20mA

• Digital, Analog, and PWM Brightness Control

• 2.7V to 5V Input Voltage Range

• 0.5MHz Operating Frequency (8MHz internal clock)

• Soft Start

The FAN5608 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. Proprietary internal circuitry continuously monitors

the currrent on both strings and automatically adjusts the

generated output DC voltage to the lowest minimum value

required by the LEDs string with the highest summarized

forward voltage. This adaptive nature of the FAN5608

ensures operation at the highest possible efﬁciency. 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 voltages do notexceed

the speciﬁed operating output voltage range. Although it is

not required to have an equal number of LEDs connected in

series within each branch, the highest efﬁciency and best

current regulation is always achieved when an equal number

of LEDs are serially connected.

• Low Shutdown Current: I_CC< 1µA

• LED Short Circuit Protection

• Minimal External Components Needed

• Available in space saving 8-lead and 12-lead MLP

Packages.

In the FAN5608 device, two internal two-bit D/A converters

provide independent programmability of each output channel

current. Analog programming of the output current is

also possible in the FAN5608. To do this, ground the "B"

pins and connect a resistor between the "A" pins and a

ﬁxed supply voltage. The output current can then be

programmed to any desired value within its speciﬁed range.

The FAN5608DMPX/FAN5608MPX version uses a single

Applications

• Cell Phones

• Handheld Computers

• PDAs, DSCs, MP3 Players

• Keyboard Backlights

• LED Displays

Typical Application

Digital Brightness Control

C_IN

L = 4.7µH

2.7V to 5V

L = 4.7µH

IND

V_IN

V_OUT

2.7V to 5V

IND

V_IN

V_OUT

4.7µF

GND

CH2

CH1

DAC Input For CH1

DAC Input For CH2

GND

CH2

CH1

DAC Input For CH1

DAC Input For CH2

4X4mm MLP-12 Package

with external Schottky diode

Order Code: FAN5608HMPX

with internal Schottky diode

Order Code: FAN5608DHMPX

REV. 1.0.3 6/28/04

12 3 4 5 6 7...17

中文翻译

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与FAN5608相关器件

型号	品牌	获取价格	描述	数据表
FAN5608_06	FAIRCHILD	获取价格	Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
FAN5608DHMPX	FAIRCHILD	获取价格	Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
FAN5608DHMPX	ONSEMI	获取价格	LED Driver
FAN5608DMPX	FAIRCHILD	获取价格	Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
FAN5608HMPX	FAIRCHILD	获取价格	Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
FAN5608HMPX_NL	FAIRCHILD	获取价格	LED Driver, 2-Segment, 4 X 4 MM, LEAD FREE, MO-220WGGB, MLP-12
FAN5608MPX	FAIRCHILD	获取价格	Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
FAN5609	FAIRCHILD	获取价格	LED Driver with Adaptive Charge Pump DC/DC Converter
FAN5609MPX	FAIRCHILD	获取价格	LED Driver with Adaptive Charge Pump DC/DC Converter
FAN5609MPX_NL	FAIRCHILD	获取价格	LED Driver, 4-Segment, 4 X 4 MM, LEAD FREE, MO-220VGGC-3, MLP-16

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