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FAN7311 LCD Backlight Inverter Drive IC
January 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. The FAN7311 uses a new patent-pending phaseshift 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
Pb-Free
Yes Yes Yes Yes Yes
Operating Temperature Range
Packing Method
Rail Tape & Reel
-25C to 85C
Rail Tape & Reel Rail
Protected by U.S. Patent: 5,652,479; 7,158,390.
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6
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FAN7311 LCD Backlight Inverter Drive IC
Internal Block Diagram
RT max. 2V min. 0.5V 6A S_S RT1 MRT1
OSCILLATOR
OUTA Output Driver + + Output Control Logic Output Driver OUTB PGND OUTC OUTD
CT
Striking Logic
OLP S_S 1.4A UVLO + 2.5V Solr 105A Voltage Reference & Internal Bias Solr 2.5VREF Error Amp.
Q
SET
EA_OUT ADIM EA_IN
+
S R
UVLO + -
Q
CLR
2.5V 1.5V OLR 2V REF
VOLP
VOLP+
OLP
max. 2V min. 0.5V
Sburst 85A Va+
BCT BDIM AGND
+ Sburst UVLO
+ -
ENA 1.4V VIN
VIN
+ -
UVLO 5V
FAN7311 Rev.06
Figure 1. Functional Block Diagram of FAN7311
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 2
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FAN7311 LCD Backlight Inverter Drive IC
Pin Assignments
RT1 20 OUTB OUTA 19 18 VIN 17 PGND OUTC 16 15 OUTD 14 CT 13 RT 12 BCT 11
FAN7311
1 OLP
2 OLR
3 ENA
4 S_S
5 GND
6 REF
7 ADIM
8 BDIM
9
10
EA_IN EA_OUT
FAN7311 Rev. 05
Figure 2. Pin Configuration (Top View)
Pin Definitions
Pin #
1 2 3 4 5 6 7 8 9 10
Name
OLP OLR ENA S_S GND REF ADIM BDIM EA_IN EA_OUT
Description
Open-Lamp Protection Open-Lamp Regulation Enable Input Soft-Start Analog Ground 2.5V Reference Voltage Analog Dimming Input Burst Dimming Input Error Amplifier Input Error Amplifier Output
Pin #
11 12 13 14 15 16 17 18 19 20
Name
BCT RT CT OUTD OUTC PGND VIN OUTA OUTB RT1
Description
Burst Dimming Timing Capacitor Timing Resistor Timing Capacitor NMOSFET Drive Output D PMOSFET Drive Output C Power Ground Supply Voltage PMOSFET Drive Output A NMOSFET Drive Output B Striking Frequency Resistor
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 3
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FAN7311 LCD Backlight Inverter Drive IC
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. For typical values, TA=25C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range with -25C TA 85C and 5V VIN 25.5V, unless otherwise specified.
Symbol
VIN TA TJ TSTG JA Supply Voltage
Characteristics
Operating Temperature Range Junction Temperature Storage Temperature Range Thermal Resistance Junction-to-Ambient (still air)(1) 20-SSOP 20-SOIC 20-DIP Power Dissipation 20-SSOP 20-SOIC 20-DIP
Value
5 to 25.5 -25 to 85 150 -65 to 150 112 70 TBD(2) 1.1 1.8 TBD
Unit
V C C C
C/W
PD
W
Notes: 1. Thermal resistance test board size: 76.2 * 114.3 * 1.6mm (1S0P). JEDEC standard: JESD51-2, JESD51-3. 2. To be determined.
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 4
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FAN7311 LCD Backlight Inverter Drive IC
Electrical Characteristics
For typical values, TA=25C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range with -25C TA 85C and 5V VIN 25.5V, unless otherwise specified. Specifications from -25C to 85C are guaranteed by design based on final characterization results.
Symbol
Vref V25
Characteristics
Line Regulation 2.5V Regulation Voltage
Test Condition
5 VIN 25.5V
Min.
Typ.
2
Max.
25 2.55
Unit
mV V
REFERENCE SECTION (Recommend X7R Capacitor) 2.45 TA = 25C, CT = 270pF, RT = 18k CT = 270pF, RT = 18k CT High Voltage CT Low Voltage TA = 25C, CTB = 10nF, 209.25 RT=18k CTB = 10nF, RT=18k BCT High Voltage BCT Low Voltage Open Loop Gain(3) Unit Gain Bandwidth(3) EA_IN = 0V EA_OUT = 1.5V EA_OUT = 1.5V 1 75 61 Va+0.1 4 105 85 Va+0.4 6 4 Start at open lamp Normal -> open lamp 2.2 1.3 1.75 0.7 2.5 1.5 2.00 1.4 2.8 1.7 2.25 2.1 5 VIN = Vth-0.2 VIN = 12V VIN = 12V 130 1.5 200 180 4.0 370 135 109 Va+0.7 8 2.00 Feedback Output High Voltage Output Sink Current Output Source Current EA_IN Driving Current on OLR EA_IN Driving Current on Burst Dimming Feedback High Voltage on Burst Dimming R(EA_IN) = 60k Soft-Start Current Soft-Start Clamping Voltage(3) S_S=1V 206.25 2.50
OSCILLATOR SECTION (MAIN) fosc Vcth Vctl Oscillation Frequency 110.4 108 115.0 115 2.0 0.5 119.6 122 V V kHz
OSCILLATOR SECTION (BURST) foscb Vbcth Vbctl Av GBW Veh lsin lsur Iolr Iburst Vfbh ISS Vssh Volp0 Volp1 Volr Iolp Vth Ist Iop Isb Oscillation Frequency 225.00 225.00 2 0.5 80 1.5 2.27 2.54 -1 240.75 241.75 V V dB MHz V mA mA A A V A V V V V A V A mA A Hz
ERROR AMP SECTION
SOFT-START SECTION
PROTECTION SECTION Open-Lamp Protection Voltage 0 Open-Lamp Protection Voltage 1 Open-Lamp Regulation Voltage Open-Lamp Protection Charging Current Start Threshold Voltage Startup Current Operating Supply Current Stand-by Current
UNDER-VOLTAGE LOCKOUT SECTION
Note: 3. These parameters, although guaranteed, are not 100% tested in production.
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 5 www.fairchildsemi.com
FAN7311 LCD Backlight Inverter Drive IC
Electrical Characteristics (Continued)
For typical values, TA=25C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range with -25C TA 85C and 5V VIN 25.5V, unless otherwise specified. Specifications from -25C to 85C are guaranteed by design based on final characterization results.
Symbol
ON/OFF SECTION Von Voff Vpdhv Vphlv Vndhv Vndhv Vpuv Vnuv tr tf
Characteristics
On State Input Voltage Off Stage Input Voltage PMOS Gate High Voltage PMOS Gate Low Voltage NMOS Gate Drive Voltage NMOS Gate Drive Voltage
Test Condition
Min.
2
Typ.
Max.
5 0.7
Unit
V V V
OUTPUT SECTION VIN = 12V VIN = 12V VIN = 12V VIN = 12V VIN-0.3 0.3 200 200 500 500 6.5 VIN VIN-10.5 VIN-8.5 8.5 0 VIN-6.5 10.5 V V V V V ns ns
PMOS Gate Voltage With UVLO Activated VIN = Vth-0.2 NMOS Gate Voltage With UVLO Activated VIN = Vth-0.2 Rising Time(4) Falling Time(4) Min. Overlap Between Diagonal Switches(4) Max. Overlap Between Diagonal Switches(4) VIN = 12V, CL=2nF VIN = 12V, CL=2nF fosc = 100kHz fosc = 100kHz RT = 18k RT = 18k
MAX./MIN. OVERLAP 0 100 % %
DELAY TIME PDR_A/NDR_B(4) PDR_C/NDR_D(4) 450 450 ns ns
Note: 4. These parameters, although guaranteed, are not 100% tested in production.
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 6
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FAN7311 LCD Backlight Inverter Drive IC
Function Description
UVLO: The under-voltage lockout circuit guarantees stable operation of the IC's control circuit by stopping and starting it as a function of the VIN value. The UVLO circuit turns on the control circuit when VIN exceeds 5V. When VIN is lower than 5V, the IC's standby current is less than 200A. ENA: Applying voltage higher than 2V to the ENA pin enables operation of the IC. Applying voltage lower than 0.7V to the ENA pin disables operation of the inverter. Soft-Start: The soft-start function requires that the S_S pin is connected through a capacitor to GND. A soft-start circuit ensures a gradual increase in the input and output power. The capacitor connected to the S_S pin determines the rate at which the duty ratio rises. It is charged by a 6A current source. Figure 4. Main Oscillator Waveform Burst Oscillator & Burst Dimming: The timing capacitors (BCTs) are charged by the reference current source, which is formed by the timing resistor (RT). The timing resistor's voltage is regulated at 1.25V. The sawtooth waveform charges up to 2V. Once this voltage is reached, the capacitors begin discharging down to 0.5V. Next, the timing capacitors start charging again and a new switching cycle begins. The burst dimming frequency can be programmed by adjusting the RT and BCT values. The burst dimming frequency can be calculated as shown in Equation 2.
fburst =
Figure 3. Soft-Start During Initial Operation Main Oscillator: The timing capacitors (CTs) are charged by the reference current source, which is formed by the timing resistor (RT). The timing resistor's voltage is regulated at 1.25V. The sawtooth waveform charges up to 2V. Once this voltage is reached, the capacitors begin discharging down to 0.5V. Next, the timing capacitors start charging again and a new switching cycle begins. The main frequency can be programmed by adjusting the RT and CT values. The main frequency can be calculated as shown below.
3.75 96 RT CT
(2)
To avoid visible flicker, the burst dimming frequency should be greater than 120Hz. By comparing the input of BDIM pin with the 0.5~2V triangular wave of the burst oscillator, the PWM pulses for burst dimming. The PWM pulse controls EA_OUT's voltage by summing 85A into the EA_IN pin.
f op =
19 32 RT C T
(1)
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 7
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FAN7311 LCD Backlight Inverter Drive IC
Figure 5. Burst Oscillator Waveform
Figure 7. OLR Voltage During Striking Mode Output Drives: The four output drives are designed so that switches A and B, C and D never turn on simultaneously. The OUTA-OUTB pair is intended to drive one half-bridge in the external power stage. The OUTCOUTD pair drives the other half-bridge.
VIN 8.5V 8.5V
VIN 8.5V
Figure 6. Burst Dimming Open Lamp Regulation and Open-Lamp Protection: It is necessary to suspend power stage operation if an open lamp occurs, because the power stage has high gain. When a voltage higher than 2V is applied to the OLR pin, the part enters regulation mode and controls the EA_OUT voltage. This limits the lamp voltage by summing 105A into the feedback node. At the same time, the OLP capacitor, connected to the OLP pin, is charged by the 1.4A internal current source. Once it reaches 2.5V, the IC enters shut down where all output is high.
8.5V
Figure 8. Phase-Shift Control Waveforms
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 8
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FAN7311 LCD Backlight Inverter Drive IC
Timing Diagram
The FAN7311 uses the improved phase-shift control full-bridge to drive CCFL. As a result, the temperature difference between the left and the right leg is almost zero. The detail timing is shown below.
EA_OUT CT SYNC T T1
POUT A
NOUT B
POUT C
NOUT D
FAN7311 Rev.04
Figure 9. Phase-Shift Control Waveforms
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 9
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FAN7311 LCD Backlight Inverter Drive IC
Typical Application Circuits
Application
19-inch LCD Monitor
Lamps
4
Input Voltage
13V
1. Schematic
F1 FUSE CN5 1 2 3 4 5 6 7 8 9 10 12505WR-10 C22 220F 25V M1 C25 1F C27 1F C26 R6 OLP OLR RT1 OUTB OUTA VIN PGND OUTC OUTD CT RT C4 EA_OUT BCT RT FB 4.7nF C5 R5 EA_IN C3 4.7n 220pF 27k 0.1F 82k RT
12V
0
IC1
FAN7311
0
0
SN GN SP GP
DN DN DP DP
0
0
OUTB OUTA
C6 1F R25 10k
ON/OFF
R24 10k C28 10nF C1 0.22F
ENA
C7 10F TX1 C8 10F
LTM190EX
1 HOT CN1 CCFL COLD 2
0 0 0
C2
S_S GND
0 0
J1 0
FDS8958A
0 DIM(0~3.3V) REF
0
M2
1F
REF ADIM
0
SN GN
DN DN DP
1
HOT CN2 CCFL COLD
R2 56k
R7
0 BDIM
C10 15pF
C11 15pF
2
R4 22k
0 0 0
C21 10nF
R3 18k
R27 10k
SP GP
OLP1
DP
OLP2
FDS8958A OLR D4 BAV70 R26 1k C14 10nF R13 1k C30 10nF
0
0
D6 BAV99
R16 1k
D7 BAV99
R17 1k
R8 100k
R9 9.1k
R15 10k
0
0
0
FB
0
0
0
0
0
OLR R14 100k
0
TX2
1
HOT CN3 CCFL COLD
2 1 OLP1 R22 10k R23 10k OLP2 2 HOT CN4 CCFL COLD
REF 0 OLP
Q1
C9 1F KST2222 R1 330k
C12 15pF
C13 15pF OLP3
OLP4
D11 BAW56 R20 10k
OLP3 R21 10k
OLP4
C19 2.2nF
C20 2.2nF OLR
D1 BAW56
D3 BAV70
0
0
R12
1k
C29 10nF
R11 1k
C15
D8 BAV99
10nF
R18 1k
D9 BAV99
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
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 10 www.fairchildsemi.com
FAN7311 LCD Backlight Inverter Drive IC
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
5. BOM of the Application Circuit Part Ref.
F1 R1 R2 R3 R4 R5 R6 R8 R9 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 C1 C2 C3 C4
Value
Fuse 24V 3A
Description / Vendor
Fuse 1608 J 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 J 1608 J 1608 J 1608 J 1608 J 1608 J 1608 F 1608 J 16V 1608 K 50V 2012 K 50V 1608 K 50V 1608 K
Part Ref.
C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C17 C18 C19 C20 C21 C25 C26 C27 C28 C29 C30 D1 D3 D4 D6 D7 D8 D9 D10 D11 Q1
Value
220pF 1F 10F 10F 1F 15pF 15pF 15pF 15pF 10nF 10nF 2.2nF 2.2nF 2.2nF 2.2nF 10nF 1F 0.1F 1F 10nF 10nF 10nF
Description / Vendor
50V 1608 J 50V 2012 K 16V 3216 16V 3216 16V 1608 K 3KV 3216 3KV 3216 3KV 3216 3KV 3216 50V 1608 K 50V 1608 K 50V 1608 Z 50V 1608 Z 50V 1608 Z 50V 1608 Z 50V 1608 Z 50V 2012 K 16V 1608 K 50V 2012 K 50V 1608 Z 50V 1608 K 50V 1608 K Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor
Resistor (SMD) 330k 56k 18k 22k 27k 82k 100k 9.1k 1k 1k 1k 100k 10k 1k 1k 1k 1k 10k 10k 10k 10k 10k 10k 1k 10k Capacitor (SMD) 0.22F 1F 4.7nF 4.7nF
Diode / TR (SMD) BAW56 BAV70 BAV70 BAV99 BAV99 BAV99 BAV99 BAW56 BAW56 KST2222
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 11
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FAN7311 LCD Backlight Inverter Drive IC
5. BOM of the Application Circuit (Continued)
Part Ref.
C22 M1 M2 TX1 TX2
Value
220F
Description / Vendor
25V Fairchild semiconductor Fairchild semiconductor
Part Ref.
CN1 CN2 CN3 CN4 CN5
Value
35001WR-02A 35001WR-02A 35001WR-02A 35001WR-02A 12505WR-10
Description / Vendor
Electrolytic capacitor MOSFET (SMD) FDS8958A FDS8958A EFD2124 EFD2124
Wafer (SMD)
Transformer (SMD)
Supported by Namyang electronics (http://www.namyangelec.co.kr)
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 12
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FAN7311 LCD Backlight Inverter Drive IC
Mechanical Dimensions
20-SSOP
Dimensions are in millimeters unless otherwise specified.
NOTE
1. THESE DIMENSIONS DO NOT INCLUDE MOLD PROTRUSION. 2. ( ) IS REFERENCE 3. [ ] IS ASS'Y OUT QUALITY
-0.05 +0.10
0.05MIN
0.10 MAX
BD-6305 Rev. 00 2001.04.06
0.10 MAX
Figure 12. 20-Lead Shrink Small Outline Package (SSOP)
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 13
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FAN7311 LCD Backlight Inverter Drive IC
Mechanical Dimensions (Continued)
20-SOIC
Dimensions are in millimeters unless otherwise specified.
Symbol A A1 B C D E e H h L N ccc Notes:
Inches Min. Max.
Millimeters Min. Max.
Notes
.093 .104 .004 .012 .013 .020 .009 .013 .496 .512 .291 .299 .050 BSC .394 .010 .016 20 0 -- 8 .004 .419 .029 .050
2.35 2.65 0.10 0.30 0.33 0.51 0.23 0.32 12.60 13.00 7.40 7.60 1.27 BSC 10.00 0.25 0.40 20 0 -- 8 0.10 10.65 0.75 1.27
5 2 2
3 6
1. Dimensioning and tolerancing per ANSI Y14.5M-1982. 2. "D" and "E" do not include mold flash. Mold flash or protrusions shall not exceed .010 inch (0.25mm). 3. "L" is the length of terminal for soldering to a substrate. 4. Terminal numbers are shown for reference only. 5. "C" dimension does not include solder finish thickness. 20 11 6. Symbol "N" is the maximum number of terminals.
E
H
1
10
D h x 45 A e B A1 C SEATING PLANE -C- LEAD COPLANARITY ccc C L
January 2001, Rev. A soic20_dim.pdf
Figure 13. 20-Lead Small Outline Integrated Circuit (SOIC)
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 14
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FAN7311 LCD Backlight Inverter Drive IC
Mechanical Dimensions (Continued)
20-DIP
Dimensions are in millimeters unless otherwise specified.
Figure 14. 20-Lead Dual In-Line Package (DIP)
(c) 2006 Fairchild Semiconductor Corporation FAN7311 Rev. 1.0.6 15
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FAN7311 LCD Backlight Inverter Drive IC
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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, or (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 significant injury to the user. 2. A critical component is 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, and 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.
No Identification Needed
Full Production
Obsolete
Not In Production
Rev. I22
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