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1,LCDTV AC/DC Power range,Input Power,14” LCD TV,44 W 70W 140W 180W 195W 285W,20” LCDTV,26” LCD TV,32” LCD TV,37” LCD TV,40” LCDTV,300W input LCD-TV SMPS Specifications,2,AHB TOPOLOGY,Asymmetric control half bridge converter,3,24V/8A circuit,4,12V/3A,5V/2A and 5V/1A STB circuit,5,Full load measurement,Board size:170mmx215mm, Height:35mm,Attachment:1.ML4800/FAN48002.FAN7382 3.FAN5234 4.FSDM3115.FSCQ0765,Rev 1.1,7,ML4800: Average Current Sense,Vin,Isense,IGainmod,8,ML4800/FAN4800 Continuous Mode,Peak to RMS ratio lower: Lower I2R lossesRipple current: Lower core lossesLower EMI: Smaller input filterRequires very fast boost diode,9,ML4800/FAN4800 A High Performance PFCAverage Current,CCM,ML4800/ML4824,10,ML4800/FAN4800 A More Detail Circuit,11,An Example: ML4800,12,ML4800/FAN4800 Gain Modulator-(I),Gain Modulator: Generate the reference current wave-form.IAC Input: rectified AC input sine wave Decides the “Shape” of the current ReferenceVEAO Input: Vo Decides the “Size” of the current Reference to regulate the Vo.VRMS Input: RMS AC line voltage Feed-forward the 1 / Vin(rms)2 to speed up the response & maintain a constant loop gain.,13,ML4800/FAN4800 Gain Modulator-(II),Vin,Isense,IGainmod,Vin2Vin, then Isense2Isense,=Pin4Pin = Vout . So it is necessary for a RMS AC line voltage feed forward to make Isense 0.5Isense while Vin2Vin.,14,ML4800/FAN4800 Gain Modulator-(III),K is a function of VRMS-2 . Left is the K/ VRMS curve,* the K of the curve is in units of m V-1,IGAINMOD = GAIN * IAC = K * (VEAO- 0.625 ) * IAC , K is in units of V-1,Average line voltage compensation with brownout control,15,ML4800/FAN4800 Gain Modulator-(IV),Continuous mode PFC controllers modify the gain error in the control loopFor voltages in the range 85V to 220V, the gain curve compensates for the Vrms dependencyWithout this compensation, the gain of the control loop would be directly proportional to Vrms2For voltages below 85V, the gain curve provides brownout protection,Modulator compensates for effect of loop gain increase with VIN(RMS)2 with piecewise linear curve,16,ML4800/FAN4800:“Slew Enhanced” Error Amp Improves Transient Response,VFB,Special shaped, non-linear gain error amplifiers are used. Such that under steady-state operating conditions the transconductance of the error amplifier is at a local minimum. Lower gain to get higher PF when in Steady State. Higher gain to get fast transient response,17,ML4800/FAN4800 VFB (Pin 15) Tri-Fault Detect,Should VFB go too low (* Pin 15 2.75 V), or open, the internal Tri-Fault Detect circuit will senses the error and terminates the PFC output driver.,18,ML4800/FAN4800 Switching Frequency Setting(Pin7),ML4824-1:fpwm=fpfcML4824-2: fpwm=2fpfcML4800:fpwm=fpfc fpfc 1/ (0.51* RT CT ),19,ML4800/FAN4800 Vin OK Comparator,The Vin OK Comparator monitors the DC output of the PFC and inhibit the PWM if the voltage on the VFB is less than 2.45 V. Once this voltage reaches over 2.45 V, the soft-start of the PWM section begins.,20,ML4800/FAN4800 PWM Soft Start (Pin 5) - (I),ChoseCss = tDELAY * (25 uA/1.25V)Where Css is the soft start Cap. tDELAY is the desired Start- up delay.During the tDELAY only the PFC works. PWM does not work. After then, the duty of the PWM O/P begins to (gradually) expand to its normal condition.,21,ML4800/FAN4800 RAMP 2 (Pin 8) - (II)Current Mode,22,ML4800/FAN4800 RAMP 2 (Pin 8) - (III)Voltage Mode (1)- No Feed-forward,23,ML4800/FAN4800 RAMP 2 (Pin 8) - (IV)Voltage Mode (2)- with Feed-forward Ramp,24,ML4800/FAN4800 DC ILIMIT (Pin 9),the DC ILIMIT input is used for output stage overcurrent protection.,25,ML4800/FAN4800 PFC/PWM Combo Controllers,Combine: Leading edge PFC and trailing edge PWM in one package PFC turn off, then PWM turn on, at the same instant to minimize the momentary “no-load” period, thus lowering ripple voltage generated by the switching action.,PFC switch,PWM switch,26,The FAN4800 is a controllers for power factor corrected, switched mode power supplies. PowerFactor Correction (PFC) enables the use of smaller, lower cost bulk storage capacitors, reduces power line loading, and reduces stress on the components of a switched mode power supply.,Average Current Mode 23V BiCMOS Process Vcc OVP, Brown out, UVLO, Soft start Low Power Detect Comparator More Precise Spec. for OVP, OCP, Tri-Fault Low Power Consumption : 100uA, 3mA 16-pin Solution,FAN4800,27,FAN4800 vs. ML4800, ML4824 : Spec. Comparison,28,FSC HVIC Application Circuit - General Purpose,29,FSC HVIC Solution,Fairchild Semiconductor. High Side only FAN7360(250/500mA,600V) Half bridge FAN7380(60/130mA),7382(250/500mA,600V), 7385(2/2A,600V),7386(3/3A,600V),FAN7387(6/6A,600V) 3-phase FAN7390(250/500mA,600V) Self oscillation ,30,FAN52402f,FAN5234/61f,Power Solutions Switching Regulators for Point of Load Applications,3.3V,5V,12V,24V,Vin,Iout,0.3A,1A,3A,5A,20A,40A,60A,100A,120A,140A,FAN5307,FAN2001*,FAN2003*,FAN2105*,FAN5182 (Controller 1-3f) + FAN5009 (Driver),Integrated Switcher(Controller+Driver+MOSFET),Integrated Controller(Controller+Driver),Stand-alone Controller(Controller+ External Driver),Legend,FAN20112012,FAN6520A,New Product,New Products,* - Sampling Now,31,FSDM311,FeaturesBCDMOS controller + Strong Avalanche CFETBuilt in Start up CircuitInternal soft-start circuitPeak current limitNew 8DIP PKG for wide creepageTarget ApplicationFSDM311Max 8watt Charger with universal input rangeMax 20watt auxiliary P/S for PC with 220V input,8DIP,32,Block Diagram of FSDM311,1. Introduction to FPS,33,Features and Advantages of FSCQ-series,Features- Optimized for Quasi-resonant converter (Low EMI and High Efficiency)- Fully avalanche rated and 100% tested SenseFET- Pulse-by-pulse current limiting- Improved reliability through various protection functions: Over voltage, Over load, Over current, Thermal shutdown- Advanced Burst operation for low power consumption in standby (1W)- Internal Soft start function (20ms)- Extended Quasi-resonant operation for wide operation range- Reduced startup and operating currentsAdvantages- Reduced board space (simple & compact circuit design)- Decreased assembly time and field failure rate Enhanced productivity,TO-220F-5L,34,FSCQ-series Functional Block Diagram,QRC Control,Burst Mode Operation,TSD,OLP,OVP,AOCP,Latch Mode,Current Mode Control,Auto Restart Mode,SenseFET,35,FSCQ-series pin description,36,FSCQNormal Quasi-Resonant Switching at heavy load,AdvantagesReduced switching noise (Low EMI)Improved efficiencyRemoved RCD snubberLimitationsIntermittent switching at light load due to relatively large LEB time,37,FSCQExtended Quasi-Resonant Switching at light load,AdvantagesGuarantee stable operation over wide load rangeImprove efficiency at light load condition,38