Fairchild FAN7311G, FAN7311M, FAN7311N, FAN7311G, FAN7311M Schematics
...
December 2007
FAN7311
LCD Backlight Inverter Drive IC
Features |
Description |
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
Applications
LCD TV
LCD Monitor
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 proprietary phase-shift control.
20-SSOP 20-SOIC
1
1
20-DIP
1
Ordering Information
Part Number |
Package |
Operating Temperature Range |
Packing Method |
FAN7311G |
20-SSOP |
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Rail |
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FAN7311GX |
20-SSOP |
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Tape & Reel |
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FAN7311M |
20-SOIC |
-25°C to 85°C |
Rail |
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FAN7311MX |
20-SOIC |
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Tape & Reel |
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FAN7311N |
20-DIP |
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Rail |
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All packages are lead free per JEDEC: J-STD-020B standard.
IC Drive Inverter Backlight LCD — FAN7311
© 2006 Fairchild Semiconductor Corporation |
www.fairchildsemi.com |
FAN7311 Rev. 1.0.7 |
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Typical Application Circuits
Application |
Lamps |
Input Voltage |
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19-inch LCD Monitor |
4 |
13V |
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1. Schematic |
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F1 |
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FUSE |
C22 |
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C25 |
C27 |
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220μF |
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M1 |
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1μF |
1μF |
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CN5 |
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25V |
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0 |
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IC1 |
FAN7311 |
C26 |
0.1μF |
0 |
0 |
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1 |
12V |
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SN |
DN |
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2 |
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R6 |
82kΩ |
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3 |
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OLP |
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RT1 |
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RT |
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4 |
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GN |
DN |
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5 |
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OUTB |
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6 |
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OLR |
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OUTB |
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7 |
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R25 |
SP |
DP |
C7 |
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8 |
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ENA |
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OUTA |
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OUTA |
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GP |
DP |
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LTM190EX |
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10 |
ON/OFF |
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10kΩ |
10μF |
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9 |
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R24 |
C28 |
C1 0.22μF |
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C6 |
1μF |
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FDS8958A |
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TX1 |
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1 |
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12505WR-10 |
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10kΩ |
0 |
S_S |
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VIN |
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0 |
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HOT |
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10nF |
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C8 |
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0 |
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10μF |
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CN1 |
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0 |
0 |
GND |
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PGND |
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0 |
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M2 |
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2 |
CCFL |
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COLD |
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REF |
C2 |
1μF |
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J1 |
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DIM(0~3.3V) |
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0 |
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1 |
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REF |
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OUTC |
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0 |
SN |
DN |
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HOT |
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CN2 |
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R2 |
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ADIM |
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OUTD |
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C10 |
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C11 |
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2 |
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CCFL |
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56kΩ |
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GN |
DN |
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COLD |
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R7 |
0Ω |
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C5 |
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220pF |
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15pF |
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15pF |
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R4 |
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BDIM |
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CT |
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0 |
R27 |
SP |
DP |
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22kΩ |
C21 |
R3 |
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EA_IN |
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RT |
R5 |
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27kΩ |
0 |
10kΩ |
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OLP1 |
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OLP2 |
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10nF |
18kΩ |
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GP |
DP |
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C4 |
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4.7nF |
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C3 |
4.7n |
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0 |
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FDS8958A |
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EA_OUT |
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BCT |
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D6 |
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D7 |
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0 |
0 |
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OLR |
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BAV99 |
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BAV99 |
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R26 |
C14 |
R13 |
C30 |
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R16 |
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R17 |
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RT |
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D4 |
1kΩ |
10nF |
1kΩ |
10nF |
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1kΩ |
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1kΩ |
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FB |
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BAV70 |
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R8 |
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R15 |
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0 |
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0 |
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100kΩ |
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R9 |
10kΩ |
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9.1kΩ |
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FB |
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0 |
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TX2 |
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1 |
HOT |
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OLR |
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CN3 |
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R14 |
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2 |
CCFL |
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COLD |
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100kΩ |
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1 |
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REF |
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HOT |
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OLP1 |
OLP2 |
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CN4 |
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0 |
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R1 |
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R22 |
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R23 |
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2 |
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CCFL |
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OLP |
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C12 |
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C13 |
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COLD |
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330kΩ |
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10kΩ |
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10kΩ |
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Q1 |
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15pF |
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15pF |
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OLP3 |
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OLP4 |
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C9 |
KST2222 |
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C19 |
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C20 |
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1μF |
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D11 |
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BAW56 |
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OLP3 |
OLP4 2.2nF |
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2.2nF |
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OLR |
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D3 |
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D8 |
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D9 |
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D1 |
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BAV70 |
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BAV99 |
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BAV99 |
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R20 |
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R21 |
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C29 |
R11 |
C15 |
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R18 |
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R19 |
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BAW56 |
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0 |
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R12 |
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10kΩ |
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10kΩ |
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1kΩ |
10nF |
1kΩ |
10nF |
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1kΩ |
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1kΩ |
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0 |
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0 |
0 |
0 |
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0 |
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D10 |
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C18 |
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C17 |
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FB |
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BAW56 |
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2.2n |
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2.2n |
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00
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
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4. Winding Specification |
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Pin No. |
Wire |
Turns |
Inductance |
Leakage Inductance |
Remarks |
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5 --> 2 |
1 UEW 0.45 φ |
19 |
115 µH |
21.5µH |
1KHz, 1V |
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7 --> 9 |
1 UEW 0.04 φ |
2300 |
1.5 H |
280mH |
1KHz, 1V |
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© 2006 Fairchild Semiconductor Corporation |
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www.fairchildsemi.com |
|||
FAN7311 Rev. 1.0.7 |
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10 |
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IC Drive Inverter Backlight LCD — FAN7311
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