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OB3316
High Performance CCFL Controller General Description
OB3316 is a high performance Cold Cathode Fluorescent Lamp (CCFL) backlight controller IC dedicated for use in push pull configuration. The controller is designed to drive single or multiple CCFLs in Liquid Crystal Display (LCD) applications. OB3316 converts unregulated DC input voltage to the pseudo sinusoidal voltage and current waveforms in required frequency, to ignite and operate CCFL lamps. OB3316 provides a high degree of design flexibility by offering great programmability for key parameters which includes operating frequency, striking frequency, striking time, burst frequency for dimming and soft-start time. OB3316 offers variable dimming controls. Both internal burst and external low frequency PWM (LPWM) dimming methods are available for a wide range of dimming control (10% to 100%). Further more, analog dimming is provided through external DC input control to achieve 40% to 100% dimming range. The highly integrated OB3316 provides complete protection features covering IC Under Voltage Lockout (UVLO), System supply brownout protection, Output Over Voltage Protection (OVP) and Lamp Fail Safe Functions (LFSF).
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Push pull
Features
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Typical Application Circuit
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OB3316 is available in DIP16 and SOP16 packages.
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Built-in burst and external LPWM for wide range dimming control Analog dimming Control 0-3V DC voltage direct dimming without any additional components High precision reference and frequency control Support single or multiple CCFLs Flexible user programmability: External programmable constant operating frequency Programmable striking frequency and voltage control Programmable soft on/off timer Programmable striking time control Programmable internal burst mode frequency control Comprehensive protection coverage: IC supply under voltage lockout (UVLO) System supply brownout protection Output over voltage protection (OVP) Lamp Fail Safe Functions (LFSF)
Applications
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LCD Monitor LCD TV Notebook Computer LCD flat panel display for instrument, automobile and handhold device
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Confidential OB_DOC_DS_16A2
Datasheet pdf - http://www.DataSheet4U.net/
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OB3316
High Performance CCFL Controller Absolute Maximum Ratings
Parameter VDDA Input Voltage to AGND AGND to PGND I/O(all pins except pin7, 10, 13) to AGND Operating Ambient Temperature TA Operating Junction Temperature TJ Min/Max Storage Temperature Tstg Value 7V +/-0.3V -0.3 to VDDA + 0.3V 0 to 70oC 150oC -55 to 150oC
Push pull
to absolute maximum-rated conditions for extended periods may affect device reliability.
Recommended Operating Range
Parameter VDDA Voltage Operating Frequency Value 4.5V to 5.5V 30 to 150KHz
Package Thermal Characteristics
Parameter Thermal resistance θJA (SOP) Thermal resistance θJA (DIP)
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure
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High performance CCFL controller – push pull
Package
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OB3316
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Package Pb free Packing Blank:Tube A: Taping
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Package Marking Information
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R:DIP16 Q:SOP16
Blank:Normal P:Lead-free
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R: Package Designator for DIP16 P: Pb-free Package Y: Year Code WW: Week Code S: Internal tracking Code
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Part Number OB3316RP OB3316QP
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Q: Package Designator for SOP16 P: Pb-free Package Y: Year Code WW: Week Code S: Internal tracking Code
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Ordering Information
Description DIP16, pb-free SOP16, pb-free
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Value 85 oC /W 60 oC /W Confidential OB_DOC_DS_16A2
Datasheet pdf - http://www.DataSheet4U.net/
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OB3316
High Performance CCFL Controller Pin Configuration
ENA 1 CMP/SST 2 CS 3 NC 4 STIME 5 VS 6 VDDA 7 GATE2 8 16 SVD 14 BF/DMOD 13 AGND 12 RT 11 RI 10 PGND 9 GATE1
Push pull
Terminal Assignment
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name ENA CMP/SST CS NC STIME VS VDDA GATE2 GATE1 PGND RI RT AGND I/O Input I/O Input I/O Input Power Output Output Ground I/O I/O Ground Input
BF/DMOD DIM SVD
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Input Input
Pin Function Active High. Enable Control Input Connected to Loop compensation capacitor, this capacitor also sets the soft start time Lamp current sense input No Connection. Keep floating or short to ground in PCB Connected to capacitor for striking time setting Output voltage sense input Power supply N MOSFET drive output2 N MOSFET drive output1 Power ground Connected to Resistor setting strike frequency Connected to Resistor setting operating frequency Analog ground Connected to Capacitor setting Burst frequency or used for dimming mode selection (Dual functio.