Rainbow-electronics MAX1611 Manual de usuario descargar pdf (Pagina 1)

BATT



BST

GND

VL

CS

OTP

REF

UP

DN

SHDN

SYNC

SS

CC

CSAV

MINDAC

TOP VIEW

MAX1610

MAX1610/MAX1611

Digitally Controlled CCFL Backlight

Power Supplies

________________________________________________________________

Maxim Integrated Products

19-1128; Rev 0; 9/96

EVALUATION KIT

AVAILABLE

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

_______________General Description

The MAX1610/MAX1611 are fully integrated, high-

efficiency drivers for cold-cathode fluorescent lamps

(CCFLs). They operate from a 4.5V to 26V power

source. An on-board, high-switching-frequency power

MOSFET reduces external component count and mag-

netics size. The MAX1610/MAX1611 protect against

open or shorted lamps. The CCFL can be driven from

an isolated transformer secondary winding to improve

efficiency and avoid flicker at dim tube settings.

Brightness is adjusted by scaling the lamp current, or

by operating with a fixed lamp current and chopping

the CCFL on and off at a rate faster than the eye can

detect.

The MAX1610’s digital inputs increment, decrement, or

clear an internal, 5-bit up/down counter, which sets

CCFL brightness. The MAX1611 uses a System

Management Bus (SMBus) 2-wire serial interface to

directly set CCFL brightness. Both devices include

micropower shutdown and a linear regulator that elimi-

nates the need for a separate logic supply. The digital

interface remains active in shutdown, preserving the

brightness setting.

________________________Applications

Notebook/Laptop Computers

Point-of-Sale Terminals

Portable Medical Equipment

Instrument Displays

____________________________Features

Direct Digital Control of CCFL Brightness

Low Supply Current: 3mA Max Operating

20µA Max Shutdown

Low-Voltage Operation, Down to 4.5V

Internal 26V, 0.7 Power Switch

Protection Against Open or Shorted Lamps

Supports Isolated Transformer Secondary

Winding

SMBus Serial Interface (MAX1611)

No Flicker at Low Brightness (internal 280Hz

current chopping)

High Power-to-Light Efficiency

Selectable 290kHz/145kHz Switching Frequency

Oscillator SYNC Input

16-Pin Narrow SO Package

BATT



BST

GND

VL

CS

OTP

REF

SDA

SCL

SMBSUS

SYNC

SS

CC

CSAV

MINDAC

MAX1611

__________________________________________________________Pin Configurations

PART

MAX1610CSE

MAX1611CSE

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 Narrow SO

______________Ordering Information

1 2 3 4 5 6 ... 19 20

MAX1610/MAX1611 1
Power Supplies 1

Indice de contenidos

Pagina 1 - Power Supplies

16151413121110912345678BATTLXBSTGNDVLCSOTPREFUPDNSHDNSYNCSSCCCSAVMINDACTOP VIEWMAX1610SOMAX1610/MAX1611Digitally Controlled CCFL Backlig

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies10 __________________________________________________________________________________

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies_____________________________________________________________________________________

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies12 __________________________________________________________________________________

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies_____________________________________________________________________________________

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MAX1610/MAX1611switching frequency. Any rising edge on SYNC restartsa BATT-to-LX switch cycle by forcing the switch on.________MAX1610 Digital Interfa

Pagina 7

MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies_____________________________________________________________________________________

Pagina 8

NAME DESCRIPTION7 REGSELRegister Select. A zero in this bit writes the remaining seven bits into the 7-bit latch-0(Figure 13).6 SHDNB-0Complete Shutdo

Pagina 9

two 7-bit registers is used. Tables 4 and 5 describe thedata format for the configuration data.Status information can be read from the MAX1611using th

Pagina 10

MAX1610/MAX1611minimum 9% duty cycle. DAC code 00000 shuts off thelamp entirely (0% duty cycle). Figure 14 shows thechopped waveforms with the DAC set

Pagina 11

MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies_____________________________________________________________________________________

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies2 ___________________________________________________________________________________

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power SuppliesMaxim cannot assume responsibility for use of any circuitry other than circuitry enti

Pagina 14

MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies_____________________________________________________________________________________

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies4 ___________________________________________________________________________________

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies_____________________________________________________________________________________

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies6 ___________________________________________________________________________________

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MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies_____________________________________________________________________________________

Pagina 19

_______________Detailed DescriptionGetting StartedA cold-cathode fluorescent lamp (CCFL) has two termi-nals. For the CCFL to emit light, the two lamp

Pagina 20

MAX1610/MAX1611Digitally Controlled CCFL Backlight Power Supplies_____________________________________________________________________________________

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