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FAN7310 -- LCD Backlight Inverter Drive Integrated Circuit
May 2007
FAN7310 LCD Backlight Inverter Drive Integrated Circuit
Features
High-Efficiency, Single-Stage Power Conversion Wide Input Voltage Range: 5V to 24V Backlight Lamp Ballast and Soft Dimming Reduce External Components Precision Voltage Reference Trimmed to 2% ZVS full-bridge topology Soft-Start Feature PWM Control at Fixed Frequency Analog and Burst Dimming Function Synchronizable Switching Frequency with External Signal Open-Lamp Protection Open-Lamp Regulation 20-Pin SSOP
Description
The FAN7310 provides all the control functions for a series parallel resonant converter and contains 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 FAN7310 has a patent-pending on phase-shift control.
20-SSOP
Applications
LCD TV LCD Monitor
Ordering Information
Part Number
FAN7310G FAN7310GX
Package
20-SSOP 20-SSOP
Pb-Free
Yes Yes
Operating Temperature Range
-25C ~ 85C
Packing Method
Rail Tape & Reel
(c) 2005 Fairchild Semiconductor Corporation FAN7310 Rev. 1.0.3
www.fairchildsemi.com
FAN7310 -- LCD Backlight Inverter Drive Integrated Circuit
Typical Application
VCC C25 100F 0 R24 10k ENA C28 10nF 0 REF R2 R4 56k 22k DIM(0~3.3V) C21 10nF 0 R3 20k 0 C3 4.7nF 0 0 C1 1F IC1 FAN7310
OLP OLR ENA S_S GND REF ADIM BDIM EA_IN RT1 OUTB OUTA VIN PGND OUTC OUTD CT RT
R6 100k OUTB OUTA C6 1F 0 0
C27 1F 0 R25 10k 0
R26 10k
C22 1F 0
M1 FDS8958A M2 FDS8958A C7 10F
TX1
REF 0 C2 1F(X7R)
OUTC OUTD C5 220pF R5 27k C4 4.7nF 0 0 0 0
0
C10 15pF OLP1
CCFL
EA_OUT BCT
0 OLR FB D4 BAV99 FB C14 20nF 0 0
R8 100k
R15 R9 2k 8.2k 0
D6 BAV99 0
R16 1.5k 0
OLR OLP1 OLP R1 330k R22 10k R14 C16 100k 2.2nF 0 0
C9 1F
Q1 D11 KST2222 D1N4148 C19 2.2nF D1 0 D1N4148 0 FAN7310 Rev. 05
Figure 1. Application Circuit for CCFL
Internal Block Diagram
RT max. 2V min. 0.5V S_S SYNC OSCILLATOR Output Driver OUTB CT + + Output Control Logic Output Driver OUTD PGND OUTC OUTA
EA_OUT 6A S_S ADIM EA_IN Error Amp. + + UVLO
Q
SET
1.4A +
S
OLP 2V 2.7V
Q
CLR
R
UVLO + 2V REF OLR
Solr
105A
Solr
Sburst 85A max. 2V min. 0.5V
BCT BDIM AGND
Sburst + UVLO
Voltage Reference & Internal Bias
2.5VREF
+ -
ENA 1.4V VIN
VIN
+ -
UVLO 5V
FAN7310 Rev.03
Figure 2. Functional Block Diagram
(c) 2005 Fairchild Semiconductor Corporation FAN7310 Rev. 1.0.3 2 www.fairchildsemi.com
FAN7310-- LCD Backlight Inverter Drive Integrated Circuit
TRADEMARKS The following are registered and unregistered trademarks and service marks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx Build it Now CorePLUS CROSSVOLT CTLTM Current Transfer LogicTM (R) EcoSPARK FACT Quiet SeriesTM (R) FACT (R) FAST FastvCore FPS (R) FRFET SM Global Power Resource Green FPS
(R)
Green FPS e-Series GTO i-Lo IntelliMAX ISOPLANAR MegaBuckTM MICROCOUPLER MicroPak Motion-SPMTM (R) OPTOLOGIC (R) OPTOPLANAR PDP-SPMTM (R) Power220 (R) Power247 (R) POWEREDGE
Power-SPM (R) PowerTrench Programmable Active Droop (R) QFET QS QT Optoelectronics Quiet Series RapidConfigure SMART START (R) SPM STEALTHTM SuperFET SuperSOT -3 SuperSOT -6 SuperSOT -8
SyncFETTM (R) The Power Franchise
TM
TinyBoost TinyBuck (R) TinyLogic TINYOPTO TinyPower TinyPWM TinyWire SerDes (R) UHC UniFET VCX
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD'S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Preliminary Product Status Formative or In Design First Production Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only.
Rev. I28
No Identification Needed
Full Production
Obsolete
Not In Production
(c) 2005 Fairchild Semiconductor Corporation FAN7310 Rev. 1.0.3
www.fairchildsemi.com 11

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