FAN7311M

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 -25°C to 85°C 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. © 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 220μF 25V CN5 1 2 3 4 5 6 7 8 9 10 12505WR-10 C25 1μ F M1 C27 1 μF 0 12V IC1 OLP OLR FAN7311 RT1 OUTB OUTA VIN PGND OUTC C26 R6 0.1μF 0 82k Ω RT 0 SN DN 0 0 GN DN OUTB OUTA C6 1μF R25 10k Ω SP DP ON/OFF R24 10k Ω C1 0.22μF C28 10nF ENA C7 10μF TX1 C8 10μF 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 1μF REF ADIM 0 R2 56k Ω R7 0 0 SN DN OUTD C5 220pF CT R5 27k Ω RT C4 4.7nF BCT RT 0Ω BDIM GN DN C10 15pF C11 15pF 2 COLD 0 0 0 R27 10kΩ R4 22kΩ SP DP C21 10nF R3 18k Ω C3 4.7n OLP1 GP DP OLP2 EA_IN EA_OUT FDS8958A OLR D4 BAV70 FB R26 1kΩ C14 10nF R13 1k Ω C30 10nF D6 BAV99 R16 1k Ω D7 BAV99 R17 1k Ω 0 0 R8 100k Ω R9 9.1kΩ R15 10k Ω 0 0 0 FB 0 0 0 0 0 TX2 OLR R14 100kΩ 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 1 μF R1 330kΩ R22 10kΩ R23 10kΩ OLP4 KST2222 D11 BAW56 D1 BAW56 R20 10k Ω OLP3 R21 10k Ω OLP4 C19 2.2nF C20 2.2nF OLR D3 BAV70 D8 BAV99 D9 BAV99 0 0 R12 1kΩ C29 10nF R11 1k Ω C15 10nF R18 1k Ω R19 1k Ω 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 φ 1 UEW 0.04 φ Turns 19 2300 Inductance 115 µH 1.5 H Leakage Inductance 21.5µH 280mH Remarks 1KHz, 1V 1KHz, 1V www.fairchildsemi.com © 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.7 10 FAN7311 — LCD Backlight Inverter Drive IC © 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.7 15 www.fairchildsemi.com