FAN7544M

www.fairchildsemi.com FAN7544 Features • • • • • • • Simple Ballast Controller Descriptions The FAN7544 provides simple and high performance electronic ballast control functions. The FAN7544 is optimized for electronic ballast requiring a minimum board area, by reducing component counts and lowering power dissipation. The features include programmable preheating time and frequency and programmable run frequency. The initial preheating time and frequency can be adjusted according to the types of lamps using the CPH, CT and RPH. Output gate driver circuit clamps power MOSFET gate voltage to the supply voltage. Low Start-up and Operating Current : 140µA, 6.5mA Under Voltage Lock Out With 1.9V of Hysteresis 600mA of Totem Pole Output with High State Clamp Trimmed 1.5% Internal Bandgap Reference Programmable Preheat Time & Frequency Programmable Run Frequency High Accuracy Oscillator 8-DIP 8-SOP 1 1 Internal Block Diagram 5V 9V Vsup Bias Current 1 2.1 Iph - Irt UVLO 1.9V 8 CPH 4 Vcc 2.9V 11.6V SQ RQ Vcc 1.6 µ A 10 µ A Vz 2.9V CT 2 5V Ict Irt 7 OUT1 5.2V 6.25Ict RQ Oscillator S Latch Irt=Vref/Rt 6 Frequency Divider Vcc 1.5V RT 3 Current Source Current Source OUT2 RPH 1 + 2V Iph=Vref/Rph Shutdown signal 5 − GND VCPH 5V − + TSD Rev. 1.0.0 ©2004 Fairchild Semiconductor Corporation FAN7544 Pin Assignments RPH 1 CT 2 RT 3 CPH 4 YWW 8 VCC OUT1 OUT2 GND YWW : Work Week Code FAN7544 7 6 5 Pin Definitions Pin Number 1 2 3 4 5 6 7 8 Pin Name RPH CT RT CPH GND OUT2 OUT1 VCC Pin Function Description Preheat frequency set resistor Oscillator frequency set capacitor Oscillator frequency set resistor Preheat time set capacitor Ground Gate drive output 2 Gate drive output 1 Supply voltage 2 FAN7544 Absolute Maximum Ratings Parameter Supply Voltage Peak Drive Output Current Output Drive Clamping Diode Current CPH, CT, RT, and RPH Pins Input Voltage Operating Temperature Range Storage Temperature Range Power Dissipation Thermal Resistance (Junction-to-Air) 8-DIP 8-SOP 8-DIP 8-SOP Symbol VCC IOH, IOL Iclamp VIN Topr Tstg Pd Rθja Value 30 ±600 ±10 -0.3 to 6 -25 to 125 -65 to 150 0.8 0.5 100 165 Unit V mA mA V °C °C W °C/W Temperature Characteristics (-25°C ≤ Ta ≤ 125°C) Parameter Temperature Stability for Operating Frequency (fos) Symbol ∆fos(Typ) Value 3 Unit % 3 FAN7544 Electrical Characteristics Unless otherwise specified, for typical values Vcc=15V, Ta=25°C, For Min/Max values Ta is the operating ambient temperature range with -25°C ≤ Ta ≤ 125°C and 12.7V ≤ VCC ≤ 30V Parameter Start Threshold Voltage UVLO Hysteresis SUPPLY CURRENT SECTION Start Up Supply Current Operating Supply Current Dynamic Operating Supply Current OSCILLATOR SECTION CPH Pin Charging Current 1 CPH Pin Charging Current 2 CPH Pin Clamp Voltage Preheating Frequency Preheating Dead Time Operating Frequency Operating Dead Time CT Threshold Voltage(note1) CT Charging Current CT Discharging Current Temperature Stability (Note1) Voltage Stability OUTPUT SECTION Gate Driver Source Current(note1) Gate Driver Sink Current(note1) Rising Time (Note1) Falling Time (Note1) Symbol VTH(st) HY(st) IST ICC IDCC ICPHL ICPHH VCLAMP fPH tpd fOS tOD ∆VCT ICHG IDIS ∆f/∆T ∆f/∆V Conditions VCC Increasing VCC < VTH(st) Output not switching 50kHz, CL =1nF VCPH=2V VCPH=4V VCPH=0V, RPH=47kΩ, CT=470pF VCPH=0V, RPH=47kΩ, CT=470pF VCPH=Open, RT=80kΩ, CT=470pF VCPH=Open, RT=80kΩ, CT=470pF Ta=25°C -25°C ≤ Ta ≤ 125°C, VCC = 25V 12.7V ≤ VCC ≤ 30V, Ta=25°C Min. 10.5 1.4 1.3 7 4.8 70 0.8 45.5 1.6 3.2 170 0.9 13 - Typ. 11.6 1.9 0.14 6.5 8 1.6 10 5.6 81.5 1.3 50 2.0 3.7 220 1.15 1 500 500 130 50 15 0.6 0.36 150 Max. 12.7 2.4 0.2 10 12 1.9 13 6.4 93 1.8 54.5 2.4 4.2 270 1.4 3 3 170 100 17 1 0.57 - Unit V V mA mA mA µA µA V kHz µs kHz µs V µA mA % % mA mA ns ns V V mA mA °C UNDER VOLTAGE LOCK OUT SECTION IOSOURCE VOUT=0V IOSINK tr tf Vomax Vomin ISD ILATCH TSD VOUT=14.6V CL=1nF, Vcc=15V, Ta=25°C CL=1nF, Vcc=15V, Ta=25°C VCC = 25V VCC = 5V, IO = 100µA RPH=47kΩ VCC = 15V - Maximum Output Voltage Output Voltage With UVLO Activated PROTECTION SECTION Shutdown Sink Current(note1) Latch Mode Quiescent Current Thermal Shutdown Junction Temperature (Note1) Note: 1. These parameters, although guaranteed, are not 100% tested in production. 4 FAN7544 Typical Characteristics 0.008 0.007 0.006 0.005 8 10 9 idcc @VCC=30V idcc @VCC=15V idcc @VCC=12.5V Idcc[A] 0.004 0.003 0.002 0.001 0.000 -0.001 0 5 10 15 20 25 30 Current [mA] 7 6 5 4 -60 -40 -20 0 20 40 60 80 100 120 140 Vcc[V] Temperature [°C] Figure 1. UVLO 14.0 13.5 13.0 12.5 12.0 11.0 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 -60 -40 -20 0 20 40 60 80 100 120 140 3 -60 -40 4 9 Figure 2. Dynamic Operating Current UV+ UVicc @VCC=30V icc @VCC=15V iccl @VCC=12.5V 8 Current [mA] Voltage [V] 11.5 7 6 5 -20 0 20 40 60 80 100 120 140 Temperature [°C] Temperature [°C] Figure 3. UVLO Hysteresis 53 Figure 4. Operating Current Rt=80kΩ, Ct=470p 52 51 fosc [kHz] 50 49 48 47 -60 -40 -20 0 20 40 60 80 100 120 140 Temperature [°C] Figure 5. Switching Frequency 5 FAN7544 Typical Characteristics(Con’t) 120 110 CT=470pF Vcc=15V Ta=25°C Fosc [kHz] 80 75 70 CT=470pF Vcc=15V Ta=25°C Fosc[kHz] 100 65 60 55 90 80 50 70 30 35 40 45 50 55 45 50 60 70 80 90 Rph [kΩ] Rt [kΩ] Figure 6. Preheating Frequency, CT=470pF 100 Figure 7. Switching Frequency, CT=470pF 130 120 110 CT=1nF Vcc=15V Ta=25°C Fosc[kHz] 90 80 70 60 50 40 CT=1nF Vcc=15V Ta=25°C Fosc[kHz] 100 90 80 70 60 10 15 20 25 30 20 25 30 35 40 45 50 Rph [kΩ] Rt [kΩ] Figure 8. Preheating Frequency, CT=1nF Figure 9. Switching Frequency, CT=1nF 6 FAN7544 Application Information Start-up Circuit The start-up current is supplied to the IC through the start up resistor (Rst). In order to reduce the power dissipation in Rst, the Rst is connected to the full wave rectified output voltage. The following equations can be used to calculate the size of Rst Vin ( ac ) × 2 – Vth ( st ) ,max Rst < -------------------------------------------------------------------------Ist ,max 85 × 2 – 12.5 = ------------------------------------- = 539k Ω –3 0.2 × 10 ( Vin ( ac_max ) ⋅ 2 – Vcc ) P RSt = ----------------------------------------------------------------------- ≤ 0.5W R St 2 R St ≥ 2 × ( Vin ( ac_max ) ⋅ 2 – Vcc ) R St ≥ 260K 2 ∴260K ≤ R St ≤ 539K The size of supply capacitor (Cs) is normally decided in terms of the start up time and operating current built up by auxiliary operating current source. The turn off snubber capacitor (CQ) and two diodes (D1, D2) constitute the auxiliary operating current source for the IC. The charging current through the CQ flows into the IC and also charges the supply capacitor. If the size of CQ is increased, the VCC voltage on the Cs is also increased. DC 400V Rectifier Output M1 G1 Rst D2 Vcc CQ Cs ZD1 D1 G2 M2 Under Voltage Lock Out(UVLO) UVLO mode of the FAN7544 is designed to maintain an ultra low supply current of less than 140uA, and to guarantee that the IC is fully functional before two output drivers are activated. Figure 10. Start-up Circuit Oscillator The gate drive output frequency is as half as that of the triangular waveform on timing capacitor (CT) at pin #2. In normal operating mode, the timing capacitor charging current is 4×Irt(=Vref/RT). The discharging current is 5.25 times of the charging current (5.25×4×Ιrt). The charging period of the timing capacitor is the on time of the MOSFET. During the discharging period, both of the MOSFETs are off. Charging Period(∆TCH) ICH Discharging Period(∆TDIS) IDIS=6.25*ICH Vref ICH VCT 3.7V CT IDIS OUT1 OUT2 Dead Time Figure 11. CT & Output Waveforms 7 FAN7544 Operating Mode Vcc Vth(st) 0V < VCPH < 2.9V iCT = I RT + ;Preheating Frequency t VCPH 5V 2.9V ICPHL=1.6µA ICPHH=10µA ( 5V − 2.9V ) I PH − I RT ( 5V − 2.9V ) = I PH 2.9V ≤ VCPH < 5V iCT = I RT + VCPH ≥ 5V iCT = I RT ; Frequency Sweep I PH − I RT ( 5V − VCPH ) ( 5V − 2.9V ) ; Run Frequency t f fpre frun fpre fign frun t preheating tph ignition tsw run Figure 12. Timing Diagram The FAN7544 has three operating mode as was shown in the figure 12. 1) Preheating Mode The preheating mode is defined as the IC’s internal status is in when the lamp filaments are being heated to correct emission temperature. This is necessary for maximizing lamp life and reducing the required ignition voltage. As soon as the Vcc exceeds the UVLO high threshold , the preheating time set-up capacitor, CPH starts to be charged by the internal 1.6µA current source until the VCPH reaches 2.9V. From 0V to 2.9V of the VCPH after the VCPH start to be charged, the switching frequency throughout the preheating mode is determined by CT and RPH and the preheating time is decided by the CPH and the 1.6µA current source. (∆TPRE=CPH×2.9V/1.6µA) 2) Ignition mode The ignition mode is defined as the IC’s internal status is in when a high voltage is established across the lamp necessary for igniting the lamp. When the VCPH exceeds 2.9V, the FAN7544 enters the ignition mode, and moves to the run mode when the VCPH exceeds 5V. In this period, the internal 10µA current source charges the external preheating timing capacitor(CPH) in order to increase noise immunity with sharp slop of the VCPH. The ignition time is decided CPH and internal 10µA current source(∆TIGN=CPH×∆VCPH2/ICPHH). In this mode, the switching frequency is determined by CT, RPH and RT because the ICT is decided by the following equation. ICT = I RT + I RPH − I RT ( 5V − VCPH ) 2.1 3) Run Mode After the lamp has successfully ignited, the FAN7544 enters run mode. The run mode is defined as the IC’s internal status is in when the lamp is being driven with a normal power level after the lamp is discharged. The run mode switching frequency is determined by the timing resistor RT and timing capacitor CT. As soon as the VCPH exceeds 5V, the protection masking mode is disable and the IC can enter the protection mode. Protection Mode If the voltage at the RPH pin decreases below 2V during the run mode, the FAN7544 enters the protection mode and all gate drive outputs(OUT1 & OUT2) are latched off in the low state and the VCPH is decreased to 0V. To exit the protection mode, the Vcc must go down below the UVLO low threshold. 8 FAN7544 Application Circuit D4 1 4 L1 5 DC_400V D1 D12 D13 C1 R1 1 3 R13 D10 NTC R12 CY1 CY2 C4 D2 1 D11 1 R4 R2 D3 R5 M1 R8 R9 R6 5 Idet C3 8 Vcc 7 OUT 6 GND C2 R11 CX2 LF1 C5 CX1 R3 TNR F1 1 1 2 2 1 FAN7527B EA_OUT MULT R7 CS R10 1 INV 2 C6 3 4 1 VR1 1 1 R14 AC INPUT DC_400V M50 C100//C101 1 5 C53 R53 L100 ZD51 6 8 3 2 R104, R105 R106 R54 C102 M51 C54 L200 1 5 2 R50 T1 R52 1 D101 R204, R205 R206 C52 R51 R55 2 R56 D50 2 D51 C200//C201 D201 DC_400V R200, R201 D200 R203 C58 R59 C56 ZD53 C202 8 Vcc 7 OUT1 6 OUT2 5 GND 2 2 R60 R202 R100, R101 R102 R103 2 Q51 2 FAN7544 RPH CPH CT RT ZD50 Q50 R57 ZD52 C203 2 Ignition Fail Detection Circuit C51 C50 2 1 RPH 2 CT 3 RT 4 CPH D100 C57 R58 C103 C55 2 Open Lamp Detection Circuit 9 FAN7544 Components List (for Wide-Range 32W× 2Lamps Application) Part number INPUT PART F1 CX1 CX2 CY1, CY2 TNR NTC D10, D11, D12, D13 Value 250V, 3A 47nF, 275Vac 150nF, 275Vac 2200pF, 3000V 470V 10Ω 400V, 1A 910kΩ 22kΩ 25.5kΩ 10Ω 22kΩ 0.47Ω 100kΩ 2.2kΩ 220kΩ 150kΩ 4.7Ω 0Ω 10kΩ 0.22µF, 630V 47µF, 450V 10µF, 50V 105 102 105 0.9mH(80T:6T) 600V, 1A, Ultrafast Schottky Diode Small Signal Diode 500V, 5A, Power Mosfet 390kΩ 39Ω 0Ω 47kΩ 5.6Ω 62kΩ 51kΩ 82kΩ 820kΩ 300kΩ Note Fuse Box-Cap Box-Cap Y-Cap 471 10D09 1N4004 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 1W Ceriamic, 1206 Ceriamic, 1206 1W 1W Ceriamic, 1206 Ceriamic, 1206 Variable Resistor Miller-Cap Electrolytic Electrolytic Ceramic, 0805 Ceramic, 0805 Ceramic, 0805 EI2820 UF4005 MBR0540 FDLL4148 FQP5N50C, FQPF5N50C 1W Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 1W Ceriamic, 0805 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 Manufacturer Fairchild - PFC PART R1, R2, R8 R3 R4 R5 R6 R7 R9 R10 R11 R12 R13 R14 VR1 C1 C2 C3 C4 C5 C6 L1 D1, D4 D2 D3 M1 Fairchild Fairchild Fairchild Fairchild - Ballast PART R50 R51, R53 R52, R57, R60 R54, R55 R56 R58, R59 RPH RT R100, R104, R200, R204 R101, R105, R201, R205 10 FAN7544 Part number R102, R202 R103, R203 R106, R206 C50 C51 C52, C53 C54 C55, C56, C57, C58 CT CPH C100, C101, C200, C201 C102, C202 L100, L200 T1 Q50 M50, M51 D50, D51, D100, D101, D200, D201 ZD50, ZD51 ZD52, ZD53 Value 5.1kΩ 50kΩ 30kΩ 4.7µF, 50V 105 104 1nF, 630V 104 471 474 6.8nF, 630V 4.7nF, 1000V 3.2mH(120T) 4mH(50T:50T) 4mH(50T:100T) NPN transistor 500V, 5A, Power Mosfet Small Signal Diode 15V, 1W Zener Diode 15V, Zener Diode Note Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 Electrolytic Ceriamic, 0805 Ceramic, 1206 Miller-Cap Ceramic, 0805 Ceramic, 0805 Ceramic, 0805 Miller-Cap Miller-Cap EE2820 EE1614 KST2222A FQP5N500C, FQPF5N50C FDLL4148 1N4744A MMSZ5245B Manufacturer C53: 0Ω, ZD51 : Open Fairchild Fairchild Fairchild Fairchild Fairchild 11 FAN7544 Mechanical Dimensions Package Dimensions in millimeters/inches 8-SOP-225 12 FAN7544 Mechanical Dimensions (Continued) Package Dimensions in millimeters/inches 8-DIP-300 13 FAN7544 Ordering Information Product Number FAN7544N FAN7544M FAN7544MX Package 8DIP 8SOP 8SOP -25°C ~ +125°C Operating Temperature Packing Tube Tape & Reel DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT 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, and (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 a significant injury of the user. www.fairchildsemi.com 2. A critical component in 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. 9/21/04 0.0m 001 Stock#DSxxxxxxxx  2004 Fairchild Semiconductor Corporation