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| FAN7316 -- LCD Backlight Inverter Drive IC January 2008 FAN7316 LCD Backlight Inverter Drive IC Features 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 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. 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 FAN7316M FAN7316MX Package 20-SOIC 20-SOIC Operating Temperature -25 to +85C -25 to +85C Packing Method RAIL TAPE & REEL All packages are lead free per JEDEC: J-STD-020B standard. Protected under U.S. patent number 5,652,479. (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com FAN7316 -- LCD Backlight Inverter Drive IC Block Diagram Figure 1. Internal Block Diagram (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 2 FAN7316 -- LCD Backlight Inverter Drive IC Pin Assignments BCT/FT OUTH OLP3 OLP4 SCP OLR VIN 11 10 20 19 18 17 16 15 VS 14 13 F PXYTT FAN7316 3 4 5 6 7 8 9 1 2 OUTL OLP1 OLP2 BDIM ADIM CMP GND ENA VB 12 RT F : Fairchild logo P : Assembly site code XY : Year & weekly code TT : Die run code FAN7316 : Device name Figure 2. Package Diagram (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 VREF FB www.fairchildsemi.com 3 FAN7316 -- LCD Backlight Inverter Drive IC Pin Definitions Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Name OLP1 OLP2 CMP FB BDIM ADIM ENA GND OUTL VREF VIN VB OUTH VS SCP RT BCT/FT Description 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. 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 burst dimming input. The voltage range of 0.5 to 2V at this pin controls burst mode duty cycle from 0% to 100%. This pin is for positive analog dimming input. This voltage to 2V at this pin controls the amplitude of the lamp current. This pin is for turning on/off the IC. Ground. Low-side driver output. The output stage can deliver about 500mA source and sink current, typically. 6V reference voltage. IC supply voltage. 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. High-side driver output. The output stage can deliver about 500mA source and sink current, typically. High-side floating supply return. Layout care should be taken to avoid below-ground spikes on this pin. 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 programs the switching frequency. The resistor should be connected between this pin and ground. 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. 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. 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. 18 OLR 19 20 OLP4 OLP3 (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 4 FAN7316 -- 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. Symbol VIN VB VS TJ TSTG JA PD IC Supply Voltage Parameter High-Side Floating Supply High-Side Floating Supply Return Operating Junction Temperature Storage Temperature Range Thermal Resistance Junction-Air Power Dissipation (1,2) Min. 4.5 -0.3 -2 (3) Max. 24 33 VB-7 +150 +150 90 1.4 Unit V V V C C C /W W -40 -65 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 VIN VB VS TA IC Supply Voltage Parameter High-Side Floating Supply High-Side Floating Supply Return Operating Ambient Temperature Min. 4.5 VS-0.3 (3) Max. 22 VS+6.5 25 +85 Unit V V V C -25 Notes: 3. The VS is tolerant to short negative transient spikes. Pin Breakdown Voltage Pin # 1 2 3 4 5 6 7 8 9 10 Name OLP1 OLP2 CMP FB BDIM ADIM ENA GND OUTL VREF Value 7 7 7 7 7 7 7 7 7 Unit Pin # 11 12 13 14 15 16 17 18 19 20 Name VIN VB OUTH VS SCP RT BCT/FT OLR OLP4 OLP3 Value 24 33 7 33 7 7 7 7 7 7 Unit V V (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 5 FAN7316 -- LCD Backlight Inverter Drive IC Electrical Characteristics For typical values, TA=25C, VIN=18V, and -25C TA 85C, unless otherwise specified. Specifications to -25C ~ 85C are guaranteed by design based on final characterization results. Symbol Parameter Test Conditions Min. Typ. Max. Unit VREF Section (Recommend X7R Capacitor) V6 V6line V6load 6V Regulation Voltage 6V Line Regulation 6V Load Regulation CMP=0V VIN=7V, 18V 10A165mA 5.76 6.00 6.24 25 60 V mV mV Oscillator Section (Main) Vfbth Vcth Vctl FB Threshold Voltage CT High Voltage CT Low Voltage (4) (4) ADIM=1, OLP=0V 0.45 2.0 0.5 V V V Oscillator Section (Burst) foscb Vbcth Vbctl Vbctft Oscillation Frequency BCT High Voltage BCT Low Voltage BCT Fault Voltage TA=25C, BCT=10nF BCT=10nF BCT=10nF BCT=10nF SCP=2.5V 288 282 300 300 2 0.5 4 312 318 Hz Hz V V V Error Amplifier Section Gm1 AV V2 lsin lsur1 Isur2 Isur3 Error Amplifier Trans-conductance Error Amplifier Open-loop Gain 2V Regulation Voltage CMP Sink Current CMP Source Current 1 CMP Source Current 2 CMP Source Current 3 (4) (4) CMP=1, ADIM=1V 100 360 50 600 umho dB TA=25C, ADIM=2.5V 1.97 2.00 260 2.03 V ppm/C ADIM=1V, FB=2.5V CMP=1V, FB=0V 1.75V 66 -134 100 -100 1.6 0 134 -66 A A A A Under-Voltage Lockout Section (UVLO) Vth Vthhys Ist Iop ENA Section Vena Vdis Isb Enable State Input Voltage Disable Stage Input Voltage Stand-by Current ENA=0 100 2 5 0.7 150 V V A Start Threshold Voltage Start Threshold Voltage Hysteresis Start-up Current Operating Supply Current ENA=2.5V ENA=2.5V VIN=Vth-0.2 Not switching 3.9 0.2 20 4.2 0.4 60 1.5 4.5 0.6 150 2.0 V V A mA Note: 4. These parameters, although guaranteed, are not 100% tested in production. (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 6 FAN7316 -- LCD Backlight Inverter Drive IC Electrical Characteristics (Continued) For typical values, TA=25C, VIN=18V, and -25C TA 85C, unless otherwise specified. Specifications to -25C ~ 85C are guaranteed by design based on final characterization results. Symbol Protection Section Vscp Vcmpr Volp Vovp Volr1 Volr2 Volrhy tscp tcmp tolp tolr TSD Short-Circuit Protection Voltage CMP Protection Voltage Open-Lamp Protection Voltage Over-Voltage Protection Open-Lamp Regulation Voltage 1 Open-Lamp Regulation Voltage 2 Open-Lamp Regulation Hysteresis Short-Circuit Protection Delay CMP Protection Delay (5) (5) (5) Parameter Test Conditions Min. 1.9 2.8 1.4 2.85 1.60 1.9 Typ. 2.0 3.0 1.5 3.00 1.75 2.0 250 1.5 100 1.5 100 1.5 1.5 100 150 Max. 2.1 3.2 1.6 3.15 1.90 2.1 1.6 120 1.6 120 1.6 10 1.6 120 Unit V V V V V V mV s ms s ms s ms s ms C Striking, foscb=300Hz Normal, foscb=300Hz Striking, foscb=300Hz Normal, foscb=300Hz Striking, foscb=300Hz Normal, foscb=300Hz Striking, foscb=300Hz Normal, foscb=300Hz 1.4 80 1.4 80 1.4 6 1.4 80 Open-Lamp Protection Delay (5) Open-Lamp Regulation Delay Thermal Shutdown (5) (5) Output Section fnrmo fstr Vouvh Vouvl Vosth Vost Vohh Vohl Idsurh Idsinh Idsurl Idsinl tdead Output Normal Frequency Output Striking Frequency OUTH Voltage Before Start-up OUTL Voltage Before Start-up High-Side Output Voltage at VENA=0V Low-Side Output Voltage at VENA=0V High-Side Output Voltage Low-Side Output Voltage High-Side Output Drive Source Current High-Side Output Drive Sink Current Low-Side Output Drive Sink Current Dead Time (5) (5) (5) (5) TA=25C, RT=27k RT=27k TA=25C, RT=27k RT=27k VIN=Vth-0.6 VIN=Vth-0.6 VIN=18V VIN=18V VIN=18V VIN=18V VIN=18V VIN=18V VIN=18V VIN=18V 47.4 47 61.5 61 -0.45 -0.45 -0.45 -0.45 5.5 5.5 49.0 49 64.0 64 0 0 0 0 6.0 6.0 500 500 500 500 500 50.6 51 66.4 67 0.45 0.45 0.45 0.45 6.5 6.5 kHz kHz V V V V V V mA mA mA mA ns Low-Side Output Drive Source Current (5) Note: 5. These parameters, although guaranteed, are not 100% tested in production. (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 7 FAN7316 -- LCD Backlight Inverter Drive IC Typical Performance Characteristics 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. (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 8 FAN7316 -- LCD Backlight Inverter Drive IC Typical Performance Characteristics (Continued) 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. (c) 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. (c) 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. (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 11 FAN7316 -- LCD Backlight Inverter Drive IC Functional Description 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 150A. tch tdch 2V - 9A BC T 18A Ich + S Q Idch 0.5V - R Q 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. + 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: fOSC 2736 [KHz] R T [K] 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 The striking frequency is 1.3 times as high as the main frequency. Figure 26. Positive Analog Implementation Circuit 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. (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 12 www.fairchildsemi.com 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. Negative dimming polarity 2V BDIM BCT 0.5V ADIM 3.5V Lamp current 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. Positive dimming polarity 2V 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 CMP 0.5V 0V Charge current 100uA Disharge current 100uA BDIM BCT 0.5V ADIM 3.0V FB 0V Lamp current OUTH 0V 6V Lamp current 0V 6V 6V OUTL OUTH 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. Figure 32. Positive Burst Dimming Operation (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 13 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. Positive dimming polarity 2V BDIM BCT 0.5V Lamp isn t ignited Lamp is ignited OLP 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 Figure 35. Burst Dimming During Striking Mode 2V - Ich 9A BCT 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. + S Q Idch 18A 0.5V - R Q + 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. Figure 36. MOSFETs Gate Drive Signal (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 14 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: CIN = Q GATE VGATE (3) The ratio between capacitors CIN and CBS is proportional to the cyclical voltage loss: C BS >> C IN (4) 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: 100). 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 10s, the drop on the bootstrap MOSFET is about 0.24V. VDROP = 24nC * 100 = 0.24 V 10s (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 100A to 1.6A. If the OLR voltage reaches at 2V, CMP source current decreases to 0A, 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 (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 15 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. 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 BCT 2V 0.5V OLP 1.5V Lamp isn't ignited 450 cycles SCP 2V 6V OUTH 6V 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. OUTL Shutdown Figure 43. Short-Circuit Protection in Striking Mode 4V Protection Delay 100ms @ BCT=300Hz BCT 2V 0.5V Lamp is ignited 32 cycles OLP 1.5V SCP 2V 6V 6V Figure 41. Open-Lamp Protection in Striking Mode Shutdown 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 (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 16 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 BCT 2V 0.5V OLP 1.5V Lamp isn't ignited 450 cycles CMP 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 150C, the thermal shutdown triggers. (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 17 FAN7316 -- LCD Backlight Inverter Drive IC Typical Application Circuit (LCD Backlight Inverter) Application 19-Inch LCD Monitor Device FAN7316 Input Voltage Range 14.510% Number of lamps 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 FUSE C1 330u 0 C2 1u 0 C3 1u 0 TX1 LTM190EX 1 CN2 35001WR-02A 1 1 2 CN1 35001WR-02A 2 OLP3 OLP4 OLR 0 0 0 0 1 2 OLP3 R2 R3 100k 100k C5 10n R1 30k R24 0R C6 1u M1 D2 BAV70 DN1 C8 3p R4 10k 0 C9 3p OLP4 2 C10 2.7n 0 R5 10k 0 C11 2.7n 0 VS SCP BCT OUTH VB RT OLP3 CN5 1 2 3 4 5 6 7 8 9 10 OLP4 OLR VIN SN1 15V IC1 R31 10R 0 GN1 DN1 D3 BAV70 R6 680 0 R7 680 0 1 FAN7316 DIM(0~3.3V) C4 10u SN2 DN2 CN4 R30 35001WR-02A TX2 OUTL VREF OLP1 OLP2 BDIM ADIM ON/OFF GND CMP ENA 10R GN2 DN2 1 2 C7 10u AOP800 FB 12505WR-10 0 CN3 35001WR-02A 1 2 1 2 OLP1 R8 R9 100k 100k C12 33n 0 R25 N.C. R22 0R C23 N.C. 0 0 0 C15 3p R14 10k 0 C16 3p OLP2 R15 10k 0 2 OLP1 OLP2 REF R13 100k C13 1u 0 R27 10k OLR R18 100k 0 R10 12k C14 0.1u R20 10k C17 10n 0 0 R12 75k R11 9.1k 0 R23 N.C. 0 R29 0 D4 BAV70 C18 2.7n 0 C19 2.7n 0 C21 4.7n 0 D5 BAV70 R17 680 0 R16 680 0 R28 C20 1n 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 (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 18 FAN7316 -- LCD Backlight Inverter Drive IC 4. Winding Specification Pin No. 5 7 2 9 Wire 1 UEW 0.45 1 UEW 0.04 Turns 12 2560(=0+360*7) Inductance 94H 3.88H Leakage Inductance 9.1H 420mH Remarks 1kHz, 1V 1kHz, 1V 5. BOM of the Application Circuit Part Ref. F1 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R27 R28 R29 R30 R31 C2 C3 C4 Value Fuse 24V 3A Resistor (SMD) 30k 100k 100k 10k 10k 680 680 100k 100k 12k 9.1k 75k 100k 10k 10k 680 680 100k 10k 10k 20k 0 NC 0 NC 10k 20k 0 10 10 Capacitor (SMD) 1F 1F 10F Description FUSE 1608 F 1608 J 1608 J 1608 F 1608 F 1608 F 1608 F 1608 J 1608 J 1608 F 1608 F 1608 F 1608 J 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 J 1608 F Part Ref. C5 C6 C7 C10 C11 C12 C13 C14 C17 C18 C19 C20 C21 C23 C8 C9 C15 C16 D2 D3 D4 D5 C1 M1 Value 10nF 1F 10F 2.7nF 2.7nF 33nF 1F 10nF 10nF 2.7nF 2.7nF 1nF 4.7nF NC Capacitor (DIP) 3p 3p 3p 3p Diode (SMD) BAV70 BAV70 BAV70 BAV70 330 MOSFET (SMD) AOP800 Wafer (SMD) 35001WR-02A 35001WR-02A 35001WR-02A 35001WR-02A 12505WR-10 Transformer (DIP) Description 50V 1608 K 50V 2012 K 16V 3216 50V 1608 K 50V 1608 K 50V 1608 K 50V 3216 K 50V 1608 K 50V 1608 K 50V 1608 K 50V 1608 K 50V 1608 K 50V 1608 K 3KV 3KV 3KV 3KV Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor 25V Alpha & Omega Electrolytic capacitor 1608 F 1608 F 1608 J 1608 J 50V 3216 K 50V 3216 K 16V 3216 TX1 TX2 CN1 CN2 CN3 CN4 CN5 EFD2126 EFD2126 (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 19 FAN7316 -- LCD Backlight Inverter Drive IC Physical Dimensions 13.00 12.60 11.43 20 B 11 A 9.50 10.65 7.60 10.00 7.40 2.25 1 PIN ONE INDICATOR 0.51 0.35 0.25 M 1.27 CBA 10 1.27 0.65 LAND PATTERN RECOMMENDATION 2.65 MAX SEE DETAIL A C 0.33 0.20 0.10 C SEATING PLANE 0.75 0.25 (R0.10) (R0.10) 8 0 X 45 0.30 0.10 NOTES: UNLESS OTHERWISE SPECIFIED GAGE PLANE 0.25 1.27 0.40 (1.40) 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 E) LANDPATTERN STANDARD: SOIC127P1030X265-20L F) DRAWING FILENAME: MKT-M20BREV3 SEATING PLANE DETAIL A 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/ (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 20 FAN7316 -- LCD Backlight Inverter Drive IC (c) 2007 Fairchild Semiconductor Corporation FAN7316 * 1.0.1 www.fairchildsemi.com 21 |
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