on bright OB3309 free download

File name OB3309_datasheet.pdf

Highly Integrated U Type CCFL Backlight Controller OB3309 Product Specification GENERAL DESCRIPTION OB3309 is a highly integrated and high performance U-type Cold Cathode Fluorescent Lamp (CCFL) controller optimized for LCD display backlight application. Comprehensive protection functions are integrated, thus it provides a cost effective yet high reliability LCD backlight solution. Operating in push pull configuration, OB3309 converts DC input voltage to the pure sinusoidal voltage and current waveforms, to ignite and operate CCFL lamps. It provides a high degree of design flexibility by offering great programmability for key parameters which include operating frequency, striking frequency, striking time, dimming polarity, burst dimming frequency, soft-start time, and soft on/off time for burst dimming. Various dimming modes control and dimming polarity programmability are offered. Both internal burst and external low frequency PWM (LPWM) dimming methods are available for a wide range of dimming control. Analog dimming is also provided through external DC input control to achieve wide dimming range. The highly integrated OB3309 provides complete protection features covering output over voltage, over output current protection, lamp fail safe function, and IC under voltage lockout. FEATURES High performance push pull topology Optimized for U type CCFL solution Adjustable dimming polarity Analog dimming control Internal burst dimming control Adjustable minimum duty for internal burst dimming id e nf Co The OB3309 is available in SOP-16 Packages. VIN gh t TYPICAL APPLICATION nt i LCD Monitor LCD TV PRT 0-2V DC voltage direct dimming control without external circuits Output over voltage protection (OVP) Output over current protection (OCP) Open lamp protection and short lamp protection Arcing protection Comprehensive Protection Coverage: APPLICATIONS Flat panel display al Adjustable minimum reference voltage for analog dimming to External burst (LPWM) dimming control Br i DIM 1 2 3 4 5 6 7 8 ENA RI RT DRC BF/DMOD POL VDD GATE1 DIM STIME CMP CS PRT VS GND GATE2 16 15 14 13 12 11 10 9 ENA On - PRT VS +5V OB3309 GND Figure1. OB3309 Typical Application Schematic ©On-Bright Electronics Confidential -1Preliminary Datasheet OB_DOC_DS_330900 IV VS VS Flexible Dimming mode Control: T Adjustable striking frequency & time Highly Integrated U Type CCFL Backlight Control OB3309 Absolute Maximum Ratings Parameter VDD Input Voltage to GND CS to GND I/O to GND Operating Ambient Temp. TA Operating Junction Temp. TJ Min/Max Storage Temp. Tstg Lead Temp. (10 Sec) Value 7V -1.5V to VDD+0.3V -0.3V to VDD + 0.3V -20 oC ~ 85oC 150oC -55 oC ~150oC 260 oC may affect device reliability. Recommended Operating Range Parameter VDD Voltage Operating Frequency Value 4.5V to 5.5V 30K to 150KHz Ordering Information Part Number OB3309QP OB3309QPA ratings" may cause permanent damage to the device. These are stress ratings only, functional