FAN7316 LCD Backlight Inverter Drive IC Features Description The FAN7316 is a LCD backlight inverter drive IC that controls N-N half-bridge topology. The FAN7316 can also drive push-pull topology. High-Efficiency Single-Stage Power Conversion Wide Input Voltage Range: 4.5V to 24V Backlight Lamp Ballast and Soft Dimming Reduces Required External Components Precision Voltage Reference Trimmed to 2% N-N Half-Bridge Topology PWM Control at Fixed Frequency Analog and Burst Dimming Function Selectable Burst Dimming Polarity by ADIM Voltage Striking Frequency Depending on Normal Frequency Open-Lamp Protection Open-Lamp Regulation Short-Circuit Protection 20-Pin SOIC The FAN7316 provides a low-cost solution by integrating the external open-lamp protection circuit. The operating voltage of the FAN7316 is wide, so the FAN7316 doesn’t need an external regulator to supply the voltage to the IC. The FAN7316 has the internal bootstrap driver, so the external fast recovery diode can be avoided. The FAN7316 provides various protections, such as open-lamp regulation, arc protection, open-lamp protection, short-circuit protection, and CMP-high protection to increase the system reliability. The FAN7316 provides analog dimming, burst dimming, and burst dimming polarity selection functions. The FAN7316 is available in a 20-SOIC package. Applications LCD TV LCD Monitor Ordering Information Part Number Package Operating Temperature Packing Method FAN7316M 20-SOIC -25 to +85°C RAIL FAN7316MX 20-SOIC -25 to +85°C TAPE & REEL All packages are lead free per JEDEC: J-STD-020B standard. Protected under U.S. patent number 5,652,479. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com FAN7316 — LCD Backlight Inverter Drive IC January 2008 FAN7316 — LCD Backlight Inverter Drive IC Block Diagram Figure 1. Internal Block Diagram © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 2 FAN7316 — LCD Backlight Inverter Drive IC VB VIN 17 OUTH BCT/FT 18 VS OLR 19 SCP OLP4 20 RT OLP3 Pin Assignments 16 15 14 13 12 11 F OLP2 CMP FB BDIM 6 7 8 9 10 VREF 5 OUTL 4 GND 3 ENA 2 ADIM 1 OLP1 PXYTT FAN7316 F : Fairchild logo P : Assembly site code XY : Year & weekly code TT : Die run code FAN7316 : Device name Figure 2. Package Diagram © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 3 Pin # Name Description 1 OLP1 2 OLP2 This pin is for open-lamp protection. If OLP is lower than 1.5V at initial operation, the IC operates at striking mode for BCT 450 cycles. If OLP is lower than 1.5V in normal mode, the IC is shut down after a delay of three BCT cycles. 3 CMP 4 FB 5 BDIM This pin is for burst dimming input. The voltage range of 0.5 to 2V at this pin controls burst mode duty cycle from 0% to 100%. 6 ADIM This pin is for positive analog dimming input. This voltage to 2V at this pin controls the amplitude of the lamp current. 7 ENA This pin is for turning on/off the IC. 8 GND Ground. 9 OUTL Low-side driver output. The output stage can deliver about 500mA source and sink current, typically. 10 VREF 6V reference voltage. 11 VIN IC supply voltage. 12 VB High-side floating supply. The bootstrap capacitor should be connected between this pin and VS pin, which can be fed by an internal bootstrap MOSFET. 13 OUTH High-side driver output. The output stage can deliver about 500mA source and sink current, typically. 14 VS High-side floating supply return. Layout care should be taken to avoid below-ground spikes on this pin. 15 SCP 16 RT This pin programs the switching frequency. The resistor should be connected between this pin and ground. 17 BCT/FT This pin programs the burst dimming frequency. A capacitor should be connected between this pin and ground. The waveform of this pin is the triangular waveform whose amplitude is from 0.5V to 2V. This pin voltage goes up to 4V when the IC enters shutdown mode. 18 OLR This pin is for open-lamp regulation. If the voltage at OLR reaches 2V, the IC makes this pin voltage be controlled not to exceed 2V. If OLR voltage is higher than 1.75V, the IC enters shutdown mode after delays of 451 BCT cycles in striking mode and three BCT cycles in normal mode, respectively. If this pin voltage is higher than 3V, the IC enters shutdown mode without delay. 19 OLP4 20 OLP3 Error amplifier output. A compensation capacitor should be connected between this pin and ground. Error amplifier inverting input. This pin voltage is regulated at 2V or ADIM voltage. This pin is for short-circuit protection. If SCP is higher than 2V, IC enters shutdown mode after a delay of 32 BCT cycles. This pin is for open lamp protection. If OLP is lower than 1.5V at initial operation, the IC operates at striking mode for BCT 450 cycles. If OLP is lower than 1.5V in normal mode, the IC is shut down after a delay of three BCT cycles. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 4 FAN7316 — LCD Backlight Inverter Drive IC Pin Definitions 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. Symbol Parameter Min. Max. Unit VIN IC Supply Voltage 4.5 24 V VB High-Side Floating Supply -0.3 33 V (3) VB-7 V °C VS High-Side Floating Supply Return -2 TJ Operating Junction Temperature -40 +150 Storage Temperature Range -65 +150 °C 90 °C /W 1.4 W TSTG θJA Thermal Resistance Junction-Air PD Power Dissipation (1,2) Notes: 1. Thermal resistance test board. Size: 76.2mm x 114.3mm x 1.6mm (1S0P); JEDEC standard: JESD51-2, JESD51-3. 2. Assume no ambient airflow. Recommended Operating Ratings The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol Parameter VIN IC Supply Voltage VB High-Side Floating Supply VS High-Side Floating Supply Return TA Operating Ambient Temperature Min. Max. Unit 4.5 22 V VS-0.3 VS+6.5 V (3) 25 V -25 +85 °C Notes: 3. The VS is tolerant to short negative transient spikes. Pin Breakdown Voltage Pin # Name Value Unit Pin # Name Value 1 OLP1 7 11 VIN 24 2 OLP2 7 12 VB 33 3 CMP 7 13 OUTH 7 4 FB 7 14 VS 33 5 BDIM 7 15 SCP 7 6 ADIM 7 16 RT 7 7 ENA 7 17 BCT/FT 7 V 8 GND 18 OLR 7 9 OUTL 7 19 OLP4 7 10 VREF 7 20 OLP3 7 © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 Unit V www.fairchildsemi.com 5 FAN7316 — LCD Backlight Inverter Drive IC Absolute Maximum Ratings For typical values, TA=25°C, VIN=18V, and -25°C ≤ TA ≤ 85°C, unless otherwise specified. Specifications to -25°C ~ 85°C are guaranteed by design based on final characterization results. Symbol Parameter Test Conditions Min. Typ. Max. Unit 5.76 6.00 6.24 V VREF Section (Recommend X7R Capacitor) V6 6V Regulation Voltage CMP=0V V6line 6V Line Regulation VIN=7V, 18V 25 mV V6load 6V Load Regulation 10µA≤16≤5mA 60 mV Oscillator Section (Main) Vfbth Vcth Vctl FB Threshold Voltage CT High Voltage CT Low Voltage ADIM=1, OLP=0V (4) (4) 0.45 V 2.0 V 0.5 V Oscillator Section (Burst) TA=25°C, BCT=10nF 288 300 312 Hz BCT=10nF 282 300 318 Hz foscb Oscillation Frequency Vbcth BCT High Voltage BCT=10nF 2 V Vbctl BCT Low Voltage BCT=10nF 0.5 V Vbctft BCT Fault Voltage SCP=2.5V 4 V Error Amplifier Section Gm1 Error Amplifier Trans-conductance AV Error Amplifier Open-loop Gain V2 2V Regulation Voltage CMP=1, ADIM=1V 100 (4) 360 600 50 TA=25°C, ADIM=2.5V 1.97 2.00 dB 2.03 260 lsin CMP Sink Current ADIM=1V, FB=2.5V lsur1 CMP Source Current 1 CMP=1V, FB=0V Isur2 CMP Source Current 2 Isur3 CMP Source Current 3 V ppm/°C 66 100 134 µA -134 -100 -66 µA 1.75V<OLR<2V (4) umho OLR>2V 1.6 µA 0 µA Under-Voltage Lockout Section (UVLO) Vth Start Threshold Voltage ENA=2.5V 3.9 4.2 4.5 V Start Threshold Voltage Hysteresis ENA=2.5V 0.2 0.4 0.6 V Ist Start-up Current VIN=Vth-0.2 20 60 150 µA Iop Operating Supply Current Not switching 1.5 2.0 mA 5 V 0.7 V 150 µA Vthhys ENA Section Vena Enable State Input Voltage Vdis Disable Stage Input Voltage Isb Stand-by Current 2 ENA=0 100 Note: 4. These parameters, although guaranteed, are not 100% tested in production. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 6 FAN7316 — LCD Backlight Inverter Drive IC Electrical Characteristics For typical values, TA=25°C, VIN=18V, and -25°C ≤ TA ≤ 85°C, unless otherwise specified. Specifications to -25°C ~ 85°C are guaranteed by design based on final characterization results. Symbol Parameter Test Conditions Min. Typ. Max. Unit Protection Section Vscp Short-Circuit Protection Voltage 1.9 2.0 2.1 V Vcmpr CMP Protection Voltage 2.8 3.0 3.2 V Volp Open-Lamp Protection Voltage 1.4 1.5 1.6 V Vovp Over-Voltage Protection 2.85 3.00 3.15 V Volr1 Open-Lamp Regulation Voltage 1 1.60 1.75 1.90 V Volr2 Open-Lamp Regulation Voltage 2 1.9 2.0 2.1 V Volrhy Open-Lamp Regulation Hysteresis 250 (5) tscp Short-Circuit Protection Delay tcmp CMP Protection Delay tolp Open-Lamp Protection Delay tolr Open-Lamp Regulation Delay TSD (5) (5) (5) (5) Thermal Shutdown mV Striking, foscb=300Hz 1.4 1.5 1.6 s Normal, foscb=300Hz 80 100 120 ms Striking, foscb=300Hz 1.4 1.5 1.6 s Normal, foscb=300Hz 80 100 120 ms Striking, foscb=300Hz 1.4 1.5 1.6 s Normal, foscb=300Hz 6 10 ms Striking, foscb=300Hz 1.4 1.5 1.6 s Normal, foscb=300Hz 80 100 120 ms (5) 150 °C Output Section fnrmo Output Normal Frequency fstr Output Striking Frequency Vouvh OUTH Voltage Before Start-up TA=25°C, RT=27kΩ RT=27kΩ TA=25°C, RT=27kΩ RT=27kΩ VIN=Vth-0.6 47.4 49.0 50.6 47 49 51 61.5 64.0 66.4 61 64 67 -0.45 0 0.45 kHz kHz V Vouvl OUTL Voltage Before Start-up VIN=Vth-0.6 -0.45 0 0.45 V Vosth High-Side Output Voltage at VENA=0V VIN=18V -0.45 0 0.45 V Vost Low-Side Output Voltage at VENA=0V VIN=18V -0.45 0 0.45 V Vohh High-Side Output Voltage VIN=18V 5.5 6.0 6.5 V Vohl Low-Side Output Voltage VIN=18V 5.5 6.0 6.5 V Idsurh High-Side Output Drive Source Current (5) Idsinh High-Side Output Drive Sink Current Idsurl Low-Side Output Drive Source Current Idsinl tdead Low-Side Output Drive Sink Current Dead Time (5) (5) (5) VIN=18V 500 mA VIN=18V 500 mA VIN=18V 500 mA VIN=18V 500 mA 500 ns (5) Note: 5. These parameters, although guaranteed, are not 100% tested in production. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 7 FAN7316 — LCD Backlight Inverter Drive IC Electrical Characteristics (Continued) Figure 3. Start Threshold Voltage vs. Temp. Figure 4. Start Threshold Voltage Hys. vs. Temp. Figure 5. Start-up Current vs. Temp. Figure 6. Standby Current vs. Temp. Figure 7. Operating Frequency vs. Temp. Figure 8. Striking Frequency vs. Temp. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 8 FAN7316 — LCD Backlight Inverter Drive IC Typical Performance Characteristics Figure 9. Burst Dimming Frequency vs. Temp. Figure 10. VREF Voltage vs. Temp. Figure 11. VREF Line Regulation Voltage vs. Temp. Figure 12. VREF Load Regulation Voltage vs. Temp. Figure 13. CMP Sink Current vs. Temp. Figure 14. CMP Source Current 1 vs. Temp. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 9 FAN7316 — LCD Backlight Inverter Drive IC Typical Performance Characteristics (Continued) Figure 15. CMP Source Current 2 vs. Temp. Figure 16. Operating Current vs. Temp. Figure 17. Error Amplifier 2V Voltage vs. Temp. Figure 18. Open-Lamp Protection Voltage vs. Temp. Figure 19. Open-Lamp Regulation Voltage 2 vs. Temp. Figure 20. Over-Voltage Protection vs. Temp. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 10 FAN7316 — LCD Backlight Inverter Drive IC Typical Performance Characteristics (Continued) Figure 21. Short-Circuit Protection Voltage vs. Temp. Figure 22. High-Side Output Voltage vs. Temp. Figure 23. Low-Side Output Voltage vs. Temp. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 11 FAN7316 — LCD Backlight Inverter Drive IC Typical Performance Characteristics (Continued) UVLO: The under-voltage lockout (UVLO) circuit guarantees the 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 4.5V. When VIN is lower than 3.9V, the IC’s start-up current is less than 150µA. t ch tdch 2V 9µA ENA: Applying voltage higher than 2V to the ENA pin enables the IC. Applying voltage lower than 0.7V to the ENA pin disables the IC. - Idch 0.5V Internal Main Oscillator: The internal timing capacitor (CT), 20pF, is charged by the reference current source, which is formed by the timing resistor (RT). The RT voltage is regulated at 1.728V. The sawtooth waveform charges up to 2V. Once CT voltage is reached, the CT begins discharging down to 0.5V. Next, the CT starts charging again and a new switching cycle begins, as shown in Figure 24. The main frequency is programmed by adjusting the RT value. The main frequency is calculated as: 2736 [KHz] R T [KΩ] + S Q R Q BC T 18µA fOSC ≈ Ich - + Figure 25. Burst Dimming Oscillator Circuit Analog Dimming: There are two kinds of analog dimming polarity: positive analog dimming and negative analog dimming. For positive analog dimming, the lamp intensity is controlled with the ADIM signal. The lamp intensity is proportional to ADIM signal; as ADIM voltage increases, the lamp intensity increases. Figure 26 shows how to implement negative analog dimming circuit and Figure 27 shows the lamp current waveform vs. DIM in positive analog dimming mode. (1) Figure 24. Main Oscillator Circuit Figure 26. Positive Analog Implementation Circuit The striking frequency is 1.3 times as high as the main frequency. Burst Dimming Oscillator: The burst capacitor timing (BCT) is charged by the internal reference current source. The triangular waveform charges up to 2V. Once the BCT voltage is reached, the capacitor begins discharging down to 0.5V. Next, the BCT starts charging again and a new switching cycle begins, as shown in Figure 25. The burst dimming frequency is programmed by adjusting BCT value. The burst dimming frequency is calculated as: fOSCB ≈ 3 • 10 3 [Hz] BCT[nF] (2) Figure 27. Positive Analog Dimming Waveform To avoid visible flicker, the burst dimming frequency should be greater than 120Hz. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 12 FAN7316 — LCD Backlight Inverter Drive IC Functional Description Negative dimming polarity 2V BDIM BCT 0.5V ADIM Lamp current 3.5V 0V 6V OUTH 6V OUTL Figure 28. Negative Analog Implementation Circuit Figure 31. Negative Burst Dimming Chosen Burst Dimming: There are also two kinds of burst dimming polarity: positive analog dimming and negative analog dimming. The lamp intensity is controlled with the BDIM voltage. By comparing the BDIM voltage with the 0.5~2V triangular waveform of burst dimming oscillator (BCT), the PWM pulse is generated. The PWM pulse controls the CMP voltage by discharging and charging the CMP capacitor. For positive burst dimming, when BDIM voltage is higher than BCT voltage, the lamp current is turned on. So, 2V on BDIM commands full brightness. The duty cycle of the PWM pulse determines the lamp brightness. The lamp intensity is proportional to BDIM voltage. As BDIM voltage increases, the lamp intensity also increases. Figure 32 shows the lamp current waveform vs. DIM in positive analog dimming mode. Figure 29. Negative Analog Dimming Waveform Burst Dimming Polarity Selection: FAN7316 provides the function to select burst dimming polarity by ADIM pin voltages. If ADIM pin voltage is lower than 3V, positive burst dimming is chosen. Refer to Figure 30. Positive dimming polarity 2V BDIM BCT 0.5V Positive dimming polarity 2V BDIM BCT 0.5V Charge current 100uA CMP Disharge current 100uA 0.5V 0V ADIM 3.0V FB 0V Lamp current 0V Lamp current 6V 0V OUTH 6V 6V OUTH OUTL 6V OUTL Figure 30. Positive Burst Dimming Chosen If the ADIM pin voltage is higher than 3.5V, negative dimming polarity is chosen. Refer to Figure 31. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 Figure 32. Positive Burst Dimming Operation www.fairchildsemi.com 13 FAN7316 — LCD Backlight Inverter Drive IC For negative analog dimming, the lamp intensity is controlled with the external DIM signal and the resistors. The lamp intensity is inversely proportional to DIM voltage. As DIM voltage increases, the lamp intensity decreases. Figure 28 shows how to implement a negative analog dimming circuit and Figure 29 shows the lamp current waveform vs. DIM in negative analog dimming mode. Positive dimming polarity 2V BDIM BCT 0.5V Lamp isn t ignited OLP Lamp is ignited 1.5V 6V OUTH 6V OUTL Burst dimming disable Burst dimming enable Figure 33. Positive Burst Dimming Operation Burst dimming can be implemented by not only DC voltage, also PWM pulse as BDIM signal. Figure 34 shows how to implement burst dimming by using PWM pulse as BDIM signal. t ch tdch 2V Ich Figure 35. Burst Dimming During Striking Mode Output Drives: FAN7316 is designed to drive high-side and low-side MOSFETs with symmetrical duty cycle. A fixed dead time of 500ns is introduced between two outputs at maximum duty cycle, as shown Figure 36. - 9µA + Idch - S Q R Q BCT 18µA 0.5V + Comparator External Pulse Signal Burst Signal to Error Amplifier BDIM + Figure 34. Burst Dimming Using an External Pulse During striking mode, burst dimming operation is disabled to guarantee the continuous striking time. Figure 35 shows that burst dimming is disabled during striking mode. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 Figure 36. MOSFETs Gate Drive Signal www.fairchildsemi.com 14 FAN7316 — LCD Backlight Inverter Drive IC For negative burst dimming, when BDIM voltage is lower than BCT voltage, the lamp current is turned on. So, 0V on BDIM commands full brightness. The duty cycle of the PWM pulse determines the lamp brightness. The lamp intensity is inversely proportional to BDIM voltage. As BDIM voltage increases, the lamp intensity decreases. Figure 32 shows the lamp current waveform vs. DIM in negative analog dimming mode. CIN = Q GATE VGATE (3) The ratio between capacitors CIN and CBS is proportional to the cyclical voltage loss: (4) C BS >> C IN For example: if QGATE is 24nC and VGATE is 10V, CIN is 2.4nF. With CBS=100nF, the drop is 240mV. The bootstrap driver introduces a voltage drop due to MOSFET RDSON (typical value: 100Ω). The following equation is useful to compute the voltage drop on the bootstrap MOSFET: VDROP = ICHARGE • R DSON → VDROP = Q GATE • R DSON TCHARGE (5) Figure 37. Open-Lamp Regulation in Striking Mode where QGATE is the gate charge of the external MOSFET, RDSON is the on resistance of the bootstrap MOSFET, and TCHARGE is the charging time of the bootstrap capacitor. For example: If QGATE is 24nC and TCHARGE is 10µs, the drop on the bootstrap MOSFET is about 0.24V. VDROP = 24nC • 100Ω = 0.24 V 10µs (6) Protections: The FAN7316 has several protections: Open-Lamp Regulation (OLR), Arc Protection, OpenLamp Protection (OLP), Short-Circuit Protection (SCP), CMP-High Protection, and Thermal Shutdown (TSD). All protections are latch-mode protections. The latch is reset when VIN falls to the UVLO voltage or ENA is pulled down to GND. Open-Lamp Regulation: When a voltage higher than 2V is applied to the OLR pin, the IC enters regulation mode and controls CMP voltage. The IC limits the lamp voltage by decreasing CMP source current. If the OLR voltage is higher than 1.75V, CMP source current decreases from 100µA to 1.6µA. If the OLR voltage reaches at 2V, CMP source current decreases to 0µA, so CMP voltage remains constant and the lamp voltage also remains constant, as shown in Figure 37. At the same time, the counter based on BCT time starts counting 450 cycles and 32 cycles at striking mode and normal mode, respectively, then the IC enters shutdown, as shown in Figure 38 and Figure 39. Figure 38. Open-Lamp Regulation in Striking Mode Figure 39. Open-Lamp Regulation in Normal Mode © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 15 FAN7316 — LCD Backlight Inverter Drive IC Bootstrap Operation: To choose the proper CBS value, the external MOSFET can be seen as an equivalent capacitor. This capacitor, CIN, is related to the MOSFET total gate charge as: Short-Circuit Protection: If SCP is higher than 2V, the counter based on BCT time starts counting 450 cycles and 32 cycles at striking mode and normal mode, respectively, then the IC enters shutdown, as shown in Figure 43 and Figure 44. 4V Striking time=1.5s @ BCT=300Hz 2V BCT 0.5V OLP 1.5V Lamp isn’t ignited 450 cycles 2V SCP 6V OUTH 6V OUTL Figure 40. Arc Protection Open-Lamp Protection: If OLP is lower than 1.5V at initial operation, the IC operates at striking mode for BCT 450 cycles, as shown in Figure 41. If OLP is lower than 1.5V at normal mode, the IC is shut down after a delay of three BCT cycles, as shown in Figure 42. Shutdown Figure 43. Short-Circuit Protection in Striking Mode 4V BCT Protection Delay 100ms @ BCT=300Hz 2V 0.5V Lamp is ignited OLP SCP 32 cycles 1.5V 2V 6V 6V Shutdown Figure 41. Open-Lamp Protection in Striking Mode Figure 44. Short-Circuit Protection in Normal Mode CMP-High Protection: If CMP is higher than 3V, the counter based on BCT time starts counting 450 cycles and 32 cycles at striking mode and normal mode, respectively, then the IC enters shutdown, as shown in Figure 45 and Figure 46. Figure 42. Open-Lamp Protection in Normal Mode © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 16 FAN7316 — LCD Backlight Inverter Drive IC Arc Protection: If OLR voltage is higher than 3V, the IC enters shutdown mode after a delay of two CT cycles, as shown in Figure 40. FAN7316 — LCD Backlight Inverter Drive IC CMP-High Protection: If CMP is higher than 3V, the counter based on BCT time starts counting 450 cycles and 32 cycles at striking mode and normal mode, respectively, then the IC enters shutdown, as shown in Figure 45 and Figure 46. 4V Striking time=1.5s @ BCT=300Hz 2V BCT 0.5V OLP 1.5V CMP Lamp isn’t ignited 450 cycles 3V 6V OUTH 6V OUTL Shutdown Figure 45. CMP-High Protection in Striking Mode Figure 46. CMP-High Protection in Normal Mode Thermal Shutdown: The IC provides the function to detect the abnormal over-temperature. If the IC temperature exceeds approximately 150°C, the thermal shutdown triggers. © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 17 Application Device Input Voltage Range Number of lamps 19-Inch LCD Monitor FAN7316 14.5±10% 4 1. Features High-Efficiency Single-Stage Power Conversion N-N Half-Bridge Topology Reduces Required External Components Enhanced System Reliability through Protection Functions F1 C1 330u FUSE C2 1u 0 OLP3 OLP4 OLR 0 0 0 0 C5 10n R2 R3 100k 100k R1 30k VB VIN VS OUTH SCP RT BCT OLR IC1 15V OLP4 OLP3 1 2 3 4 5 6 7 8 9 10 D2 BAV70 SN1 DN1 GN1 DN1 10R FAN7316 0 VREF OUTL GND ENA ADIM BDIM FB CMP OLP2 OLP1 10R C10 2.7n 0 R5 10k 1 2 2 0 0 D3 BAV70 SN2 OLP3 R6 680 35001WR-02A DN2 TX2 GN2 C12 33n OLP1 OLP2 0 REF R10 12k R13 100k R12 75k C23 N.C. 0 C7 10u CN3 35001WR-02A 10k 0 R27 10k C15 3p 0 R29 0 D4 BAV70 OLR R14 10k 0 R18 100k 0 C16 3p C18 2.7n 0 R15 10k 2 2 1 2 2 0 OLP1 C19 2.7n 0 C21 4.7n 0 0 1 OLP2 C13 1u R11 9.1k C14 0.1u R20 R23 N.C. 1 DN2 AOP800 0 R22 0R CN4 0 1 R25 N.C. R7 680 0 0 R8 R9 100k 100k 2 C11 2.7n C4 10u R30 ON/OFF R4 10k 0 R31 DIM(0~3.3V) 12505WR-10 1 1 2 OLP4 M1 CN5 C9 3p C8 3p C6 1u R24 0R 1 CN1 35001WR-02A 0 0 CN2 35001WR-02A LTM190EX TX1 C3 1u D5 BAV70 R17 680 0 0 R16 680 0 R28 0 C20 1n C17 10n 0 0 R19 10k 0 20k R21 20k Figure 47. Typical Application Circuit 2. Transformer Schematic Diagram Figure 48. Transformer Schematic Diagram 3. Core & Bobbin Core: EFD2126 Material: PL7 Bobbin: EFD2126 © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 18 FAN7316 — LCD Backlight Inverter Drive IC Typical Application Circuit (LCD Backlight Inverter) Pin No. Wire Turns Inductance Leakage Inductance Remarks 5Æ2 1 UEW 0.45φ 12 94µH 9.1µH 1kHz, 1V 7Æ9 1 UEW 0.04φ 2560(=0+360•7) 3.88H 420mH 1kHz, 1V 5. BOM of the Application Circuit Part Ref. Value Description Part Ref. Value Description C5 10nF 50V 1608 K FUSE C6 1µF 50V 2012 K C7 10µF 16V 3216 1608 F C10 2.7nF 50V 1608 K Fuse F1 24V 3A Resistor (SMD) R1 30k R2 100k 1608 J C11 2.7nF 50V 1608 K R3 100k 1608 J C12 33nF 50V 1608 K R4 10k 1608 F C13 1µF 50V 3216 K R5 10k 1608 F C14 10nF 50V 1608 K R6 680 1608 F C17 10nF 50V 1608 K R7 680 1608 F C18 2.7nF 50V 1608 K R8 100k 1608 J C19 2.7nF 50V 1608 K R9 100k 1608 J C20 1nF 50V 1608 K R10 12k 1608 F C21 4.7nF 50V 1608 K R11 9.1k 1608 F C23 NC R12 75k 1608 F R13 100k 1608 J C8 3p R14 10k 1608 F C9 3p 3KV R15 10k 1608 F C15 3p 3KV R16 680 1608 F C16 3p 3KV D2 BAV70 Capacitor (DIP) 3KV R17 680 1608 F R18 100k 1608 F R19 10k 1608 F D3 BAV70 Fairchild Semiconductor R20 10k 1608 J D4 BAV70 Fairchild Semiconductor R21 20k 1608 F D5 BAV70 Fairchild Semiconductor R22 0 R23 NC R24 0 R25 NC Diode (SMD) Electrolytic capacitor C1 330µ 25V MOSFET (SMD) M1 AOP800 35001WR-02A R27 10k 1608 F R28 20k 1608 F CN1 0 CN2 35001WR-02A R30 10 1608 J CN3 35001WR-02A 10 1608 J CN4 35001WR-02A CN5 12505WR-10 Capacitor (SMD) C2 Alpha & Omega Wafer (SMD) R29 R31 Fairchild Semiconductor 1µF 50V 3216 K C3 1µF 50V 3216 K TX1 EFD2126 C4 10µF 16V 3216 TX2 EFD2126 © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 Transformer (DIP) www.fairchildsemi.com 19 FAN7316 — LCD Backlight Inverter Drive IC 4. Winding Specification 13.00 12.60 A 11.43 20 11 B 9.50 10.65 7.60 10.00 7.40 2.25 1 PIN ONE INDICATOR 0.51 0.35 1.27 0.25 M 10 0.65 1.27 C B A LAND PATTERN RECOMMENDATION 2.65 MAX SEE DETAIL A 0.33 0.20 C 0.75 0.25 0.10 C 0.30 0.10 X 45° SEATING PLANE NOTES: UNLESS OTHERWISE SPECIFIED (R0.10) A) THIS PACKAGE CONFORMS TO JEDEC MS-013, VARIATION AC, ISSUE E B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS. D) CONFORMS TO ASME Y14.5M-1994 GAGE PLANE (R0.10) 0.25 8° 0° 1.27 0.40 SEATING PLANE (1.40) DETAIL A E) LANDPATTERN STANDARD: SOIC127P1030X265-20L F) DRAWING FILENAME: MKT-M20BREV3 SCALE: 2:1 Figure 49. 20-SOIC Package Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 20 FAN7316 — LCD Backlight Inverter Drive IC Physical Dimensions FAN7316 — LCD Backlight Inverter Drive IC © 2007 Fairchild Semiconductor Corporation FAN7316 • 1.0.1 www.fairchildsemi.com 21