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| FAN7314A -- LCD Backlight Inverter Drive IC June 2008 FAN7314A -- LCD Backlight Inverter Drive IC Features High-Efficiency Single-Stage Power Conversion Wide Input Voltage Range: 6V to 25.5V Backlight Lamp Ballast and Soft Dimming Minimal Required External Components Precision Voltage Reference Trimmed to 2% ZVS Half-Bridge Topology Soft-Start PWM Control at Fixed Frequency Analog and Burst Dimming Function Programmable Striking Frequency Open-Lamp Protection Open-Lamp Regulation Thermal Shutdown 20-Pin SOIC Description The FAN7314A provides all the control functions for a series parallel resonant converter as well as a pulse width modulation (PWM) controller to develop a supply voltage. Typical operating frequency range is between 30kHz and 250kHz, depending on the CCFL and the transformer's characteristics. The FAN7314A is available in a 20-SOIC package. Applications LCD TV LCD Monitor Ordering Information Part Number FAN7314AM FAN7314AMX Package 20-SOIC 20-SOIC Operating Temperature -25 to +85C -25 to +85C Eco Status RoHS RoHS Packing Method RAIL TAPE & REEL For Fairchild's definition of "green" Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. Protected under U.S. patent nos. 5,652,479. Important Note: For complete performance specifications, please contact one of the following: NA(TX) EU(UK) KR AP(HK) JP Jinho Choi Justin Ahn KI Jeon SH Lee Yasuhiko Itoh jinho.choi@fairchildsemi.com Justin.Ahn@Fairchildsemi.com Kwangil.Jeon@fairchildsemi.co.kr seunghwan.lee@fairchildsemi.com Yasuhiko.Itoh@fairchildsemi.com 1-972-447-1316 +44(0)1793-856 828 02-3498-0543 852-2722-8372 03-5275-8380 www.fairchildsemi.com (c) 2008 Fairchild Semiconductor Corporation FAN7314A * 1.0.2 FAN7314A -- LCD Backlight Inverter Drive Typical Application Circuit (LCD Backlight Inverter) Application 22-Inch LCD Monitor Device FAN7314A Input Voltage Range 22V5% Number of lamps 4 1. Features High-Efficiency Single-Stage Power Conversion P-N Half-Bridge Topology Reduces Required External Components Enhanced System Reliability through Protection Functions C820 1u, 50V T602S R619 100n S1 D1 C601 470u, 35V C602 470u, 35V CN603 1 22.5V ENA BDIM ADIM R610 24k R615 33k R611 9.1k C610 10n C621 1u R612 10k C622 0.22u OLP OLR ENA S_S GND REF ADIM BDIM EA_IN EA_OUT RT1 OUTB OUTA VIN PGND OUTC OUTD CT RT BCT 20 19 18 17 16 R619 51k C625 1u, 50V RT G1 S2 2 3 4 5 6 7 8 9 10 COP2 33n R634 G2 10k Q601 FDD8424H D2 D608 BAV70 R632 1k C603 5p, 3kV R633 1k C604 5p, 3kV OLP1 D606 BAV99 OLP2 D607 BAV99 FAN7314A OLR 15 14 13 12 11 C614 220p R613 30k C616 3.9n RT C651 10u, 25V C652 10u, 25V FB C642 3.9n//220p C643 3.9n//220p R628 1k R631 1k REF CN604 R616 150k COP1 1n R621 5.1k FB R617 10.7k C605 5p, 3kV R620 1k R627 1k C628 3.9n//220p C606 5p, 3kV OLP3 D603 BAV99 OLP4 D605 BAV99 R601 270k OLR REF Q602 KST2222A R614 330k D609 BAW56 C623 1n R618 100k R629 10k OLP3 OLP4 C641 D604 2.2n BAW56 C640 2.2n R630 10k R625 10k OLP2 D601 BAW56 C630 2.2n C629 2.2n OLP1 R624 10k OLR D608 BAV70 C627 3.9n//220p C624 1u R626 1k R623 1k FB Figure 9. Typical Application Circuit 2. Transformer Specifications Supported by Clover Hitech (http://www.cloverhitech.com) PART NO : EEL-22W Pin No. 2 3 1 4 7 6 8 5 Wire UTSC 0.1x12 1 UEW 0.04 Turns 19 2300 Inductance 83.0H 1.4H Leakage Inductance 16H Remarks 1kHz, 1V 280mH (c) 2008 Fairchild Semiconductor Corporation FAN7314A * 1.0.2 www.fairchildsemi.com 11 FAN7314A -- LCD Backlight Inverter Drive (c) 2008 Fairchild Semiconductor Corporation FAN7314A * 1.0.2 www.fairchildsemi.com 15 |
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