FAN7317 FAIRCHILD | Alldatasheet
Document overview
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Technical content
Features
High-Efficiency Single-Stage Power Conversion Wide Input Voltage Range: 6V to 24V Backlight Lamp Ballast and Soft Dimming Minimal Required External Components Precision Voltage Reference Trimmed to 2% ZVS Full-Bridge Topology Soft-Start PWM Control at Fixed Frequency Burst Dimming Function Programmable Striking Frequency Open-Lamp Protection Open-Lamp Regulation Arc Protection Short-Lamp Protection CMP-High Protection High-FB Protection Thermal Shutdown 20-Pin SOIC
Applications
LCD TV LCD Monitor
Description
The FAN7317 is a LCD backlight inverter drive IC that controls P-N full-bridge topology by using the new patented phase-shift method. The FAN7317 provides a low-cost solution and reduces external components by integrating full wave rectifiers for open-lamp protection and regulation (patent pending). The operating voltage range of the FAN7317 is wide, so an external regulator isn’t necessary to supply the voltage to the IC. The FAN7317 provides various protections, such as open-lamp regulation, open- lamp protection, arc protection, short-Lamp protec tion, CMP-high protection, and FB-high protection, to increase the system reliability. The FAN7317 provides burst dimming function and analog dimming is possible, in a narrow range, by adding some external components. The FAN7317 is available in a 20-SOIC package.
Ordering Information
Part Number Package Operating Temperature Packing Method FAN7317M 20-SOIC -25 to +85°C RAIL FAN7317MX 20-SOIC -25 to +85°C TAPE & REEL All packages are lead free per JEDEC: J-STD-020B standard. Protected under U.S. patent nos. 5,652,479 and 7,158,390.
4 Output
Figure 1. Internal Block Diagram
Figure 2. Package Diagram
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7317 • 1.0.2 4 FAN7317 — LCD Backlight Inverter Drive IC Pin Definitions Pin # Name Description 1 REF This pin is 5V reference output. Typically, resistors are connected to this pin from CT pin and BCT pin. 2 BDIM This pin is the input for burst dimming. The voltage range of 0.5 to 2V at this pin controls burst mode duty cycle from 0% to 100%. 3 BCT This pin is for programming the frequency of the burst dimming. Typically, a capacitor is connected to this pin from ground and a resistor is connected to this pin from the REF pin.
4 OLP1
This pin is for open-lamp protection and feedback control of lamp currents. It has the same functions as other OLP pins and is connected to the full-wave rectifier internally. In striking mode, if the minimum of rectified OLP inputs is less than 1V for 1.6s; or in normal mode, if the minimum of rectified OLP inputs is less than 0.5V for 10ms; the IC shuts down to protect the system in open lamp condition. The maximum of rectified OLP inputs is inputted to the negative of the error amplifier for feedback control of lamp current.
5 OLR1
This pin is for open-lamp regulation. It has t he same functions as other OLR pins and is connected to the full-wave rectifier internally. When the maximum of rectified OLR inputs is between 1.8V and 2V, the error amplifier output current is limited to 1µA; and when the maximum of rectified OLR inputs reaches 2V, the error amplifier output current is 0A and its output voltage maintains constant. The maximum of rectified OLR inputs is inputted to the negative of another error amplifier for feedback control of lamp voltage. When the maximum of rectified OLR inputs is more than 2.2V, anot her error amplifier for OLR is operating and lamp voltage is regulated. 6 OLP2 This pin is for open-lamp protection and feedback c ontrol of lamp currents. Its functions are the same as the OLP1 pin. 7 OLR2 This pin is for open-lamp regulation. Its functions are the same as the OLR1 pin. 8 GND This pin is the ground. 9 OUTB This pin is NMOS gate-drive output. 10 OUTA This pin is PMOS gate-drive output. 11 OUTC This pin is PMOS gate-drive output. 12 OUTD This pin is NMOS gate-drive output. 13 VIN This pin is the supply voltage of the IC. 14 OLR3 This pin is for open-lamp regulation. Its functions are the same as the OLR1 pin. 15 OLP3 This pin is for open-lamp protection and feedback c ontrol of lamp currents. Its functions are the same as the OLP1 pin. 16 OLR4 This pin is for open-lamp regulation. Its functions are the same as the OLR1 pin. 17 OLP4 This pin is for open-lamp protection and feedback c ontrol of lamp currents. Its functions are the same as the OLP1 pin. 18 ENA This pin is for turning on/off the IC. 19 CMP Error amplifier output. Typically, a compensation capacitor is connected to this pin from the ground. 20 CT This pin is for programming the switching frequenc y. Typically, a capacitor is connected to this pin from ground and a resistor is c onnected to this pin from the REF pin.
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7317 • 1.0.2 5 FAN7317 — 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 t he 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. Symbol Parameter Min. Max. Unit VIN IC Supply Voltage 6 24 V TA Operating Temperature Range -25 +85 °C TJ Operating Junction Temperature +150 °C TSTG Storage Temperature Range -65 +150 °C θJA Thermal Resistance Junction-Air (1,2) 90 °C/W PD Power Dissipation 1.4 W Notes: 2. Assume no ambient airflow. Pin Breakdown Voltage Pin # Name Value Unit Pin # Name Value Unit
1 REF 7 11 OUTC 24
2 BDIM 7 12 OUTD 7
3 BCT 7 13 VIN 24
4 OLP1 ±7 14 OLR3 ±7
5 OLR1 ±7 15 OLP3 ±7
6 OLP2 ±7 16 OLR4 ±7
7 OLR2 ±7 17 OLP4 ±7
8 GND 7 18 ENA 7
9 OUTB 7 19 CMP 7
10 OUTA 24
V
20 CT 7
V
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7317 • 1.0.2 6 FAN7317 — LCD Backlight Inverter Drive IC
Electrical Characteristics
For typical values, TA = 25°C, VIN = 15V, and -25°C ≤ TA ≤ 85°C, unless otherwise specifi ed. Specifications to -25°C ~ 85°C are guaranteed by design based on final characterization results. Symbol Parameter Test Conditions Min. Typ. Max. Unit Under-Voltage Lockout Section (UVLO) Vth Start Threshold Voltage 4.9 5.2 5.5 V Vthhys Start Threshold Voltage Hysteresis 0.20 0.45 0.60 V Ist Start-up Current V IN = 4.5V 70 100 µA Iop Operating Supply Current V IN = 15V, Not switching 2.0 3.5 mA ON/OFF Section Von On State Input Voltage 2 5 V Voff Off Stage Input Voltage 0.7 V Isb Stand-by Current V IN = 15V, ENA = Low 120 170 µA RENA Pull-down Resistor 130 200 270 k Ω Reference Section (Recommend 1µF X7R Capacitor) V5 5V Regulation Voltage 0 ≤ I5 ≤ 3mA 4.9 5.0 5.1 V V5line 5V Line Regulation 6 ≤ VIN ≤ 24V 50 mV V5load 5V Load Regulation I 5 = 3mA 50 mV Oscillator Section (Main) TA = 25°C, CT = 220pF, RT = 100kΩ 93.9 97.0 100.5 fosc Oscillation Frequency CT = 220pF, RT = 100kΩ 93 97 101 kHz TA = 25°C, CT = 220pF, RT = 100kΩ 120 124 129 fstr Oscillator Frequency in Striking Mode CT = 220pF, RT = 100kΩ 119 124 129 kHz Ictdcs Striking 0.99 1.14 1.29 mA Ictdc CT Discharge Current Normal 740 840 940 μA Ictcs CT Charge Current Striking -15 -12 -9 μA Vcth CT High Voltage 2 V Vctl CT Low Voltage 0.4 V Oscillator Section (Burst) TA = 25°C, BCT = 4.7nF, BRT = 1.4MΩ 303 314 326 foscb Burst Oscillation Frequency BCT = 4.7nF, BRT = 1.4MΩ 302 314 326 Hz Ibctdc BCT Discharge Current 14 26 38 μA Vbcth BCT High Voltage 2 V Vbctl BCT Low Voltage 0.5 V
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7317 • 1.0.2 7 FAN7317 — LCD Backlight Inverter Drive IC Electrical Characteristics (Continued) For typical values, TA = 25°C, VIN = 15V, and -25°C ≤ TA ≤ 85°C, unless otherwise specifi ed. Specifications to -25°C ~ 85°C are guaranteed by design based on final characterization results. Symbol Parameter Test Conditions Min. Typ. Max. Unit Error Amplifier Section AV Open-loop Gain (3) 37 dB Gm Error Amplifier Trans-conductance 20 40 60 µmho lsin Output Sink Current OLP = 2.25V -50 -35 -20 µA lsur Output Source Current OLP = 0.8V 12 22 32 µA Ibsin Burst CMP Sink Current 38 52 66 µA TA = 25°C 1.275 1.350 1.421 V135p 1.35V Regulation Voltage 1.255 1.350 1.444 V Iolpi OLP Input Current OLP = 2V -1 0 1 µA Iolpo OLP Output Current OLP = -2V -30 -20 -10 µA Volpr OLP Input Voltage Range (3) -4 4 V Open-Lamp Regulation Section Iolr1 Striking, OLR = Iolr2 Error Amplifier Source Current for Open-Lamp Regulation OLR = 2.1V 0 µA Volr1 Open-Lamp Regulation Voltage 1 Striking 1.65 1.80 1.95 V Volr2 Open-Lamp Regulation Voltage 2 Striking 1.95 2.05 2.15 V Volr3 Open-Lamp Regulation Voltage 3 2.1 2.2 2.3 V GmOLR OLR Error Amplifier Trans- conductance 200 350 500 µmho Iolrsi OLR Error Amplifier Sink Current Normal, OLR = 2.5V 50 70 90 µA Iolri OLR Input Current OLR = 1.5V 10 17 24 µA Iolro OLR Output Current OLR = -1.5V -25 -15 -7 µA Volrr OLR Input Voltage Range (3) -4 4 V Note: 3. These parameters, although guaranteed, are not 100% tested in production.
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7317 • 1.0.2 8 FAN7317 — LCD Backlight Inverter Drive IC Electrical Characteristics (Continued) For typical values, TA = 25°C, VIN = 15V, and -25°C ≤ TA ≤ 85°C, unless otherwise specifi ed. Specifications to -25°C ~ 85°C are guaranteed by design based on final characterization results. Protection Section Volp0 Open-Lamp Protection Voltage 0 (4) Open Lamp in Striking 0.95 1.00 1.05 V Volp1 Open-Lamp Protection Voltage 1 Open Lamp 0.44 0.51 0.58 V Vcmpr CMP-High Protection Voltage 2.95 3.05 3.15 V Varcp Arc Protection Voltage 2.90 3.05 3.20 V Vhfbp High-FB Protection Voltage (4) 3.4 3.5 3.6 V Vslp Short Lamp Protection Voltage 0.24 0.32 0.40 V Tolps Striking, f oscb = 330Hz 1.6 s Tolpn Open-Lamp Protection Delay(4) Normal, fosc = 100kHz 10 ms Tcmprs Striking, f oscb = 330Hz 1.6 s Tcmprn High-CMP Protection Delay(4) Normal, fosc = 100kHz 10 ms Tolr Open-Lamp Regulation Delay (4) Normal, f osc = 100kHz 320 µs Tslp Short Lamp Protection Delay (4) Normal, f osc = 100kHz 1 ms TSD Thermal Shutdown (4) 150 °C Output Section Vpdhv PMOS Gate High Voltage (4) V IN = 15V V IN V Vphlv PMOS Gate Low Voltage V IN = 15V V IN-6.5 V IN-7 V IN-7.5 V Vndhv NMOS Gate High Voltage V IN = 15V 6.5 7.0 7.5 V Vndlv NMOS Gate Low Voltage (4) V IN = 15V 0 V Vpuv PMOS Gate Voltage with UVLO Activated VIN = 4.5V V IN-0.3 V Vnuv NMOS Gate Voltage with UVLO Activated VIN = 4.5V 0.3 V Ipdsur PMOS Gate Drive Source Current (4) V IN = 15V -200 mA Ipdsin PMOS Gate Drive Sink Current (4) V IN = 15V 300 mA Indsur NMOS Gate Drive Source Current (4) V IN = 15V 200 mA Indsin NMOS Gate Drive Sink Current (4) V IN = 15V -300 mA tr Rising Time (4) V IN = 15V, Cload = 2nF 70 ns tf Falling Time (4) V IN = 15V, Cload = 2nF 70 ns Maximum / Minimum Overlap Minimum Overlap Between Diagonal Switches(4) fosc = 100kHz 0 % Maximum Overlap Between Diagonal Switches(4) fosc = 100kHz 86 90 % Dead Time PDR_A/NDR_B (4) 150 200 250 ns PDR_C/NDR_D (4) 150 200 250 ns Note: 4. These Parameters, although guaranteed, are not 100% tested in production.
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7317 • 1.0.2 21 FAN7317 — LCD Backlight Inverter Drive IC 4. Winding Specification Pin No. Wire Turns Inductan ce Leakage Inductance Remarks 5 Æ 2 1 UEW 0.4φ 17 250µH 16µH 1kHz, 1V 7 Æ 9 1 UEW 0.04φ 2256( = 0+0+376•6) 4.2H 290mH 1kHz, 1V 5. BOM of the Application Circuit Part Ref. Value Description Part Ref. Value Description Fuse C14 3.3n 50V 1608 K F1 24V 3A FUSE C15 100n 50V 1608 K Resistor (SMD) C17 1µ 50V 2012 K R1 10k 1608 J C18 4.7n 50V 1608 K R2 10k 1608 J C19 3.3n 50V 1608 K R3 200 1608 F C21 3.3n 50V 1608 K R5 100k 1608 F Capacitor (DIP) R6 10k 1608 J C4 3p 3KV R7 200 1608 F C13 3p 3KV R8 75k 1608 J C16 3p 3KV R9 10k 1608 J C20 3p 3KV R10 8.2k 1608 J Electrolytic capacitor R12 10k 1608 J C1 220µ 25V R13 200 1608 F C2 220µ 25V R14 1.5M 1608 F MOSFET (SMD) R15 10k 1608 J M1 FDD8424H Fairchild Semiconductor R16 200 1608 F M2 FDD8424H Fairchild Semiconductor Capacitor (SMD) Wafer (SMD) C3 1µ 50V 2012 K CN1 12505WR-10 C5 1µ 50V 2012 K CN2 35001WR-02A C6 3.3n 50V 1608 K CN3 35001WR-02A C7 10µ 16V 3216 CN4 35001WR-02A C8 10n 50V 1608 K CN5 35001WR-02A C9 10µ 16V 3216 Transformer (DIP) C10 220p 50V 1608 K TX1 EFD2126 C11 10n 50V 1608 K TX2 EFD2126 C12 1µ 50V 2012 K
B) ALL DIMENSIONS ARE IN MILLIMETERS.
2.65 MAX
Figure 58. 20-SOIC Package specifically the warranty therein, which covers Fairchild products.
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7317 • 1.0.2 23 FAN7317 — LCD Backlight Inverter Drive IC