FAIRCHILD FAN7311M

FAN7311
LCD Backlight Inverter Drive IC
Features
Description
„ High-Efficiency Single-Stage Power Conversion
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.
„ 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
20-SSOP
„ Open-Lamp Protection
20-SOIC
„ Open-Lamp Regulation
„ 20-Pin SSOP/SOIC/DIP
Applications
1
„ LCD TV
„ LCD Monitor
1
20-DIP
1
Ordering Information
Part Number
Package
Pb-Free
FAN7311G
20-SSOP
Yes
FAN7311GX
20-SSOP
Yes
FAN7311M
20-SOIC
Yes
FAN7311MX
20-SOIC
Yes
Tape & Reel
20-DIP
Yes
Rail
FAN7311N
Operating Temperature Range
Packing Method
Rail
Tape & Reel
-25°C to 85°C
Rail
Protected by U.S. Patent: 5,652,479; 7,158,390.
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
FAN7311 LCD Backlight Inverter Drive IC
January 2007
RT
max. 2V
CT
OUTA
OSCILLATOR
Output
Driver
min. 0.5V
6μA
PGND
S_S
RT1
MRT1
OUTD
OLP
Striking
Logic
S_S
1.4μA
UVLO
ADIM
+
Q
Error Amp.
Q
-
EA_IN
SET
CLR
+
S
UVLO
R
2.5V
Solr
min. 0.5V
Voltage
Reference
&
Internal
Bias
+
AGND
Sburst
VOLP
2.5V 1.5V
-
OLR
2V
2.5VREF
REF
ENA
+
-
VIN
UVLO
OLP
VOLP+α
+
Solr
105μA
Sburst 85μA
Va+α
max. 2V
BDIM
OUTC
Output
Driver
EA_OUT
BCT
OUTB
Output
Control
Logic
+
+
VIN
+
-
1.4V
UVLO 5V
FAN7311 Rev.06
Figure 1. Functional Block Diagram of FAN7311
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
2
FAN7311 LCD Backlight Inverter Drive IC
Internal Block Diagram
FAN7311 LCD Backlight Inverter Drive IC
Pin Assignments
RT1
OUTB OUTA
20
19
VIN
18
17
PGND OUTC
16
OUTD
CT
RT
BCT
14
13
12
11
9
10
15
FAN7311
1
2
3
4
5
6
7
8
OLP
OLR
ENA
S_S
GND
REF
ADIM
BDIM
EA_IN EA_OUT
FAN7311 Rev. 05
Figure 2. Pin Configuration (Top View)
Pin Definitions
Pin #
Name
1
OLP
2
3
Description
Pin #
Name
Description
Open-Lamp Protection
11
BCT
OLR
Open-Lamp Regulation
12
RT
Timing Resistor
ENA
Enable Input
13
CT
Timing Capacitor
4
S_S
Soft-Start
14
OUTD
NMOSFET Drive Output D
5
GND
Analog Ground
15
OUTC
PMOSFET Drive Output C
6
REF
2.5V Reference Voltage
16
PGND
Power Ground
7
ADIM
Analog Dimming Input
17
VIN
Supply Voltage
Burst Dimming Timing Capacitor
8
BDIM
Burst Dimming Input
18
OUTA
PMOSFET Drive Output A
9
EA_IN
Error Amplifier Input
19
OUTB
NMOSFET Drive Output B
10
EA_OUT
Error Amplifier Output
20
RT1
Striking Frequency Resistor
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
3
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=25°C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range
with -25°C ≤ TA ≤ 85°C and 5V ≤ VIN ≤ 25.5V, unless otherwise specified.
Symbol
Characteristics
Value
Unit
VIN
Supply Voltage
5 to 25.5
V
TA
Operating Temperature Range
-25 to 85
°C
TJ
Junction Temperature
150
°C
-65 to 150
°C
TSTG
θJA
Storage Temperature Range
Thermal Resistance Junction-to-Ambient (still air)(1)
20-SSOP
112
20-SOIC
70
°C/W
TBD(2)
20-DIP
Power Dissipation
PD
20-SSOP
1.1
20-SOIC
1.8
20-DIP
W
TBD
Notes:
1. Thermal resistance test board size: 76.2 * 114.3 * 1.6mm (1S0P). JEDEC standard: JESD51-2, JESD51-3.
2. To be determined.
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
4
FAN7311 LCD Backlight Inverter Drive IC
Absolute Maximum Ratings
For typical values, TA=25°C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range
with -25°C ≤ TA ≤ 85°C and 5V ≤ VIN ≤ 25.5V, unless otherwise specified. Specifications from -25°C to 85°C are guaranteed by design based on final characterization results.
Symbol
Characteristics
Test Condition
Min.
Typ.
Max.
Unit
2
25
mV
2.45
2.50
2.55
V
TA = 25°C, CT = 270pF,
RT = 18kΩ
110.4
115.0
119.6
CT = 270pF, RT = 18kΩ
108
115
122
REFERENCE SECTION (Recommend X7R Capacitor)
ΔVref
Line Regulation
5 ≤ VIN ≤ 25.5V
V25
2.5V Regulation Voltage
OSCILLATOR SECTION (MAIN)
kHz
fosc
Oscillation Frequency
Vcth
CT High Voltage
2.0
V
Vctl
CT Low Voltage
0.5
V
OSCILLATOR SECTION (BURST)
TA = 25°C, CTB = 10nF,
209.25
RT=18kΩ
225.00
240.75
foscb
Oscillation Frequency
Vbcth
BCT High Voltage
2
V
Vbctl
BCT Low Voltage
0.5
V
80
dB
1.5
MHz
CTB = 10nF, RT=18kΩ
206.25
225.00
Hz
241.75
ERROR AMP SECTION
Av
Open Loop Gain(3)
Bandwidth(3)
GBW
Unit Gain
Veh
Feedback Output High Voltage
EA_IN = 0V
lsin
Output Sink Current
EA_OUT = 1.5V
lsur
Output Source Current
EA_OUT = 1.5V
Iolr
EA_IN Driving Current on OLR
2.00
EA_IN Driving Current on Burst Dimming
Vfbh
Feedback High Voltage on Burst Dimming R(EA_IN) = 60kΩ
2.54
V
-1
mA
1
75
Iburst
2.27
mA
105
135
µA
61
85
109
µA
Va+0.1
Va+0.4
Va+0.7
V
4
6
8
µA
SOFT-START SECTION
ISS
Soft-Start Current
Vssh
Soft-Start Clamping
S_S=1V
Voltage(3)
4
V
PROTECTION SECTION
Volp0
Open-Lamp Protection Voltage 0
Start at open lamp
2.2
2.5
2.8
V
Volp1
Open-Lamp Protection Voltage 1
Normal -> open lamp
1.3
1.5
1.7
V
Volr
Open-Lamp Regulation Voltage
1.75
2.00
2.25
V
Iolp
Open-Lamp Protection Charging Current
0.7
1.4
2.1
µA
5
V
UNDER-VOLTAGE LOCKOUT SECTION
Vth
Start Threshold Voltage
Ist
Startup Current
VIN = Vth-0.2
130
180
µA
Iop
Operating Supply Current
VIN = 12V
1.5
4.0
mA
Isb
Stand-by Current
VIN = 12V
200
370
µA
Note:
3. These parameters, although guaranteed, are not 100% tested in production.
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
5
FAN7311 LCD Backlight Inverter Drive IC
Electrical Characteristics
For typical values, TA=25°C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range
with -25°C ≤ TA ≤ 85°C and 5V ≤ VIN ≤ 25.5V, unless otherwise specified. Specifications from -25°C to 85°C are guaranteed by design based on final characterization results.
Symbol
Characteristics
Test Condition
Min.
Typ.
Max.
Unit
5
V
0.7
V
ON/OFF SECTION
Von
On State Input Voltage
Voff
Off Stage Input Voltage
2
OUTPUT SECTION
Vpdhv
PMOS Gate High Voltage
VIN = 12V
Vphlv
PMOS Gate Low Voltage
VIN = 12V
Vndhv
NMOS Gate Drive Voltage
VIN = 12V
Vndhv
NMOS Gate Drive Voltage
VIN = 12V
Vpuv
PMOS Gate Voltage With UVLO Activated VIN = Vth-0.2
NMOS Gate Voltage With UVLO Activated VIN = Vth-0.2
Vnuv
tr
tf
Rising
Time(4)
Falling Time(4)
VIN
VIN-10.5 VIN-8.5
6.5
8.5
V
VIN-6.5
10.5
0
V
V
V
VIN-0.3
V
0.3
V
VIN = 12V, CL=2nF
200
500
ns
VIN = 12V, CL=2nF
200
500
ns
MAX./MIN. OVERLAP
Min. Overlap Between Diagonal
Switches(4)
fosc = 100kHz
0
%
Max. Overlap Between Diagonal
Switches(4)
fosc = 100kHz
100
%
PDR_A/NDR_B(4)
RT = 18kΩ
450
ns
PDR_C/NDR_D(4)
RT = 18kΩ
450
ns
DELAY TIME
Note:
4. These parameters, although guaranteed, are not 100% tested in production.
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
6
FAN7311 LCD Backlight Inverter Drive IC
Electrical Characteristics (Continued)
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 200µA.
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 6µA 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
19
32 ⋅ RT ⋅ C T
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 85µA into the EA_IN pin.
(1)
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
(2)
To avoid visible flicker, the burst dimming frequency
should be greater than 120Hz.
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.
f op =
3.75
96 ⋅ RT ⋅ CT
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7
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 105µA into the feedback node. At the same
time, the OLP capacitor, connected to the OLP pin, is
charged by the 1.4µA 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
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
8
FAN7311 LCD Backlight Inverter Drive IC
Figure 5. Burst Oscillator Waveform
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
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
9
FAN7311 LCD Backlight Inverter Drive IC
Timing Diagram
Application
Lamps
Input Voltage
19-inch LCD Monitor
4
13V
1. Schematic
F1
FUSE
C22
220μF
25V
CN5
1
2
3
4
5
6
7
8
9
10
12V
0.1μF
C26
FAN7311
ON/OFF
0
0
REF
DIM(0~3.3V)
OUTA
GND
1 μF
C2
R7
0
R25
10kΩ
VIN
0
PGND
0
REF
OUTC
ADIM
OUTD
BDIM
CT
220pF
R5
27kΩ
C4
4.7nF
0
R27
10kΩ
0
DN
SP
DP
GP
DP
0
C7
10μF
LTM190EX
TX1
SN
DN
GN
DN
SP
DP
GP
DP
C10
15pF
FB
R15
10kΩ
R26
1kΩ
D4
BAV70
0
OLP2
D6
BAV99
C14
10nF
0
R13
1kΩ
0
C30
10nF
0
0
0
OLP1
0
R22
10kΩ
CN3
CCFL
OLP2
R23
10kΩ
C12
15pF
CN4
CCFL
2
C13
15pF
OLP3
R20
10kΩ
R21
10kΩ
C18
2.2n
C17
2.2n
OLP4
C19
2.2nF
C20
2.2nF
OLR
0
D3
BAV70
0
R12
1kΩ
0
0
0
C29
10nF
0
R11
1kΩ
0
C15
COLD
OLP4
D8
BAV99
10nF
0
COLD
HOT
OLP3
D11
BAW56
D10
BAW56
HOT
2
1
R1
330kΩ
D1
BAW56
0
1
Q1
KST2222
R17
1kΩ
0
TX2
REF
C9
1μF
D7
BAV99
R16
1kΩ
FB
0
OLR
CN2
CCFL
COLD
OLP1
OLR
R9
9.1kΩ
CN1
CCFL
COLD
HOT
2
C11
15pF
R14
100kΩ
OLP
HOT
2
1
RT
R8
100kΩ
1
FDS8958A
0
BCT
GN
C27
1μF
0
M2
0
RT
EA_OUT
DN
C8
10μF
0
C5
SN
FDS8958A
J1
EA_IN
4.7n
RT
OUTA
0Ω
C3
0
OUTB
C6 1μF
0
R3
18kΩ
0
ENA
S_S
0
C21
10nF
OUTB
0
R2
56kΩ
R4
22kΩ
RT1
OLR
C1 0.22μF
C28
10nF
12505WR-10
OLP
0
82kΩ
R6
R24
10kΩ
C25
1μF
M1
IC1
0
0
D9
BAV99
R18
1kΩ
0
0
R19
1kΩ
0
FB
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
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
10
FAN7311 LCD Backlight Inverter Drive IC
Typical Application Circuits
Pin No.
Wire
Turns
Inductance
Leakage Inductance
Remarks
5 --> 2
1 UEW 0.45 φ
19
115 µH
21.5µH
1KHz, 1V
7 --> 9
1 UEW 0.04 φ
2300
1.5 H
280mH
1KHz, 1V
5. BOM of the Application Circuit
Part Ref.
Value
Description / Vendor
Fuse
F1
24V 3A
Fuse
Resistor (SMD)
Part Ref.
Value
Description / Vendor
C5
220pF
50V 1608 J
C6
1µF
50V 2012 K
C7
10µF
16V 3216
R1
330kΩ
1608 J
C8
10µF
16V 3216
R2
56kΩ
1608 F
C9
1µF
16V 1608 K
R3
18kΩ
1608 F
C10
15pF
3KV 3216
R4
22kΩ
1608 F
C11
15pF
3KV 3216
R5
27kΩ
1608 F
C12
15pF
3KV 3216
R6
82kΩ
1608 F
C13
15pF
3KV 3216
R8
100kΩ
1608 F
C14
10nF
50V 1608 K
R9
9.1kΩ
1608 F
C15
10nF
50V 1608 K
R11
1kΩ
1608 F
C17
2.2nF
50V 1608 Z
R12
1kΩ
1608 F
C18
2.2nF
50V 1608 Z
R13
1kΩ
1608 F
C19
2.2nF
50V 1608 Z
R14
100kΩ
1608 F
C20
2.2nF
50V 1608 Z
R15
10kΩ
1608 F
C21
10nF
50V 1608 Z
R16
1kΩ
1608 F
C25
1µF
50V 2012 K
R17
1kΩ
1608 F
C26
0.1µF
16V 1608 K
R18
1kΩ
1608 F
C27
1µF
50V 2012 K
R19
1kΩ
1608 F
C28
10nF
50V 1608 Z
R20
10kΩ
1608 J
C29
10nF
50V 1608 K
R21
10kΩ
1608 J
C30
10nF
50V 1608 K
R22
10kΩ
1608 J
Diode / TR (SMD)
R23
10kΩ
1608 J
D1
BAW56
Fairchild Semiconductor
R24
10kΩ
1608 J
D3
BAV70
Fairchild Semiconductor
R25
10kΩ
1608 J
D4
BAV70
Fairchild Semiconductor
R26
1kΩ
1608 F
D6
BAV99
Fairchild Semiconductor
R27
10kΩ
1608 J
Capacitor (SMD)
D7
BAV99
Fairchild Semiconductor
D8
BAV99
Fairchild Semiconductor
C1
0.22µF
16V 1608 K
D9
BAV99
Fairchild Semiconductor
C2
1µF
50V 2012 K
D10
BAW56
Fairchild Semiconductor
C3
4.7nF
50V 1608 K
D11
BAW56
Fairchild Semiconductor
C4
4.7nF
50V 1608 K
Q1
KST2222
Fairchild Semiconductor
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
11
FAN7311 LCD Backlight Inverter Drive IC
4. Winding Specification
Part Ref.
Value
Description / Vendor
Part Ref.
Electrolytic capacitor
C22
220µF
M1
M2
25V
CN1
CN2
35001WR-02A
FDS8958A
Fairchild semiconductor
CN3
35001WR-02A
FDS8958A
Fairchild semiconductor
CN4
35001WR-02A
CN5
12505WR-10
Transformer (SMD)
TX1
EFD2124
TX2
EFD2124
Description / Vendor
Wafer (SMD)
MOSFET (SMD)
35001WR-02A
Supported by Namyang electronics (http://www.namyangelec.co.kr)
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
Value
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12
FAN7311 LCD Backlight Inverter Drive IC
5. BOM of the Application Circuit (Continued)
FAN7311 LCD Backlight Inverter Drive IC
Mechanical Dimensions
20-SSOP
Dimensions are in millimeters unless otherwise specified.
NOTE
0.05MIN
1. THESE DIMENSIONS DO NOT INCLUDE MOLD PROTRUSION.
2. ( ) IS REFERENCE
3. [ ] IS ASS'Y OUT QUALITY
-0.05
+0.10
0.10 MAX
BD-6305 Rev. 00
2001.04.06
0.10 MAX
Figure 12. 20-Lead Shrink Small Outline Package (SSOP)
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
13
20-SOIC
Dimensions are in millimeters unless otherwise specified.
Inches
Symbol
Min.
A
A1
B
C
D
E
e
H
h
L
N
α
ccc
Millimeters
Max.
Min.
.093
.104
.004
.012
.013
.020
.009
.013
.496
.512
.291
.299
.050 BSC
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
.394
.010
.016
10.00
0.25
0.40
.419
.029
.050
20
Notes
Max.
5
2
2
10.65
0.75
1.27
3
6
20
0°
8°
0°
8°
—
.004
—
0.10
Notes:
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
6. Symbol "N" is the maximum number of terminals.
11
E
1
H
10
D
h x 45°
A1
A
C
e
SEATING
PLANE
B
–C–
α
LEAD COPLANARITY
ccc C
L
January 2001, Rev. A
soic20_dim.pdf
Figure 13. 20-Lead Small Outline Integrated Circuit (SOIC)
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
14
FAN7311 LCD Backlight Inverter Drive IC
Mechanical Dimensions (Continued)
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)
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
15
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Rev. I22
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.6
www.fairchildsemi.com
16
FAN7311 LCD Backlight Inverter Drive IC
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