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| FAN7311 -- LCD Backlight Inverter Drive IC December 2007 FAN7311 LCD Backlight Inverter Drive IC Features High-Efficiency Single-Stage Power Conversion Wide Input Voltage Range: 5V to 25.5V Backlight Lamp Ballast and Soft Dimming Reduced Number of Required External Components Precision Voltage Reference Trimmed to 2% ZVS Full-Bridge Topology Soft-Start Capability PWM Control at Fixed Frequency Analog and Burst Dimming Function Programmable Striking Frequency Open-Lamp Protection Open-Lamp Regulation 20-Pin SSOP/SOIC/DIP Description The FAN7311 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 cold cathode fluorescent lamp (CCFL) and the transformer's characteristics. FAN7311 uses a new patented phase-shift control. 20-SSOP 20-SOIC Applications LCD TV LCD Monitor 1 1 20-DIP 1 Ordering Information Part Number FAN7311G FAN7311GX FAN7311M FAN7311MX FAN7311N Package 20-SSOP 20-SSOP 20-SOIC 20-SOIC 20-DIP Operating Temperature Range Packing Method Rail Tape & Reel -25C to 85C Rail Tape & Reel Rail All packages are lead free per JEDEC: J-STD-020B standard. Protected by U.S. Patent: 5,652,479; 7,158,390. (c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.7 www.fairchildsemi.com FAN7311 -- LCD Backlight Inverter Drive IC Typical Application Circuits Application 19-inch LCD Monitor Lamps 4 Input Voltage 13V 1. Schematic F1 FUSE C22 220F 25V CN5 1 2 3 4 5 6 7 8 9 10 12505WR-10 C25 1F M1 C27 1F 0 12V IC1 OLP OLR FAN7311 RT1 OUTB OUTA VIN PGND OUTC C26 R6 0.1F 0 82k RT 0 SN DN 0 0 GN DN OUTB OUTA C6 1F R25 10k SP DP ON/OFF R24 10k C1 0.22F C28 10nF ENA C7 10F TX1 C8 10F GP DP LTM190EX 1 HOT CN1 CCFL 2 1 HOT CN2 CCFL COLD 0 0 C2 S_S GND 0 0 J1 FDS8958A 0 DIM(0~3.3V) REF 0 M2 1F REF ADIM 0 R2 56k R7 0 0 0 SN DN OUTD C5 220pF CT R5 27k RT C4 4.7nF BCT RT GN DN C10 15pF C11 15pF 2 COLD BDIM R4 22k C21 10nF R3 18k C3 4.7n EA_OUT EA_IN 0 0 0 R27 10k SP DP OLP1 GP DP OLP2 FDS8958A OLR D4 BAV70 FB R26 1k C14 10nF R13 1k C30 10nF D6 BAV99 R16 1k D7 BAV99 R17 1k 0 0 R8 100k R9 9.1k R15 10k 0 0 0 FB 0 0 0 0 0 TX2 OLR R14 100k 0 1 HOT CN3 CCFL 2 1 OLP1 OLP2 2 C12 15pF C13 15pF OLP3 HOT CN4 CCFL COLD COLD REF 0 OLP Q1 C9 1F R1 330k R22 10k R23 10k OLP4 KST2222 D11 BAW56 D1 BAW56 R20 10k OLP3 R21 10k OLP4 C19 2.2nF C20 2.2nF OLR D3 BAV70 D8 BAV99 D9 BAV99 0 0 R12 1k C29 10nF R11 1k C15 10nF R18 1k R19 1k 0 D10 BAW56 C18 2.2n C17 2.2n 0 0 0 FB 0 0 0 0 0 0 0 FAN7311 Rev. 04 Figure 10. Typical Application Circuit 2. Transformer Schematic Diagram - Supported by Namyang electronics (http://www.namyangelec.co.kr) FAN7311 Rev. 04 Figure 11. Transformer Schematic 3. Core & Bobbin Core: EFD2124 Material: PL7 Bobbin: EFE2124 4. Winding Specification Pin No. 5 --> 2 7 --> 9 Wire 1 UEW 0.45 1 UEW 0.04 Turns 19 2300 Inductance 115 H 1.5 H Leakage Inductance 21.5H 280mH Remarks 1KHz, 1V 1KHz, 1V www.fairchildsemi.com (c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.7 10 FAN7311 -- LCD Backlight Inverter Drive IC (c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.7 15 www.fairchildsemi.com |
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