Quasi-Resonant IC FA5530/31/32 Features Features FA5531Block BlockDiagram Diagram FA5531 • Internal start-up circuit with 500V rating and low frequency operation achieves 140mW input at no load. • Small Output Capacitance : Linearly reduced ZCD 1 shot (380ns) frequency for lighter load causes small ripple voltage. Time out (5µs) •Suitable for Low Noise and High Efficiency about 90% 5V •Line-up of 3 types for maximum frequency and OLP 5530: 65kHz max.,16Vmax.-VCC,Auto-restart OLP Max. fsw Blanking •Vcc rating 28V allows no series regulator for UVLO 5V Reg. Check 20kΩ Current comparator S Q OUT FB R 125k ZCD 1V Disable OVP 2 Soft start (1ms) 8V 0.4V Overload •Timer Latched Over-Voltage Protection of 16V/28V Vcc Usage : Notebook PC, LCD Monitor, LCD-TV etc. Timer latch (48µs) Timer 190ms VCC 1510ms OVP 1 Reset 28V •8 pins package ( DIP/SO ) 9.85V/9.1V Driver auxiliary winding to clamp Vcc voltage for FA5531/32. •1ms Fixed Soft Start time 5V Reg. Internal supply 125k side : 17 ohm / 3.5 ohm ) : available to 200W output VCC 5V 5532:130kHz max.,28Vmax.-VCC,Timer-Latched OLP Start up Current CLR Variable max.130kHz IS 5531:130kHz max.,28Vmax.-VCC,Auto-restart OLP •High ability of driving Power MOSFET ( High / Low Reset 50uA VH Start up management Logic Valley detection 3.3V GND Quasi-Resonant IC FA5530/31/32 ApplicationCircuit Circuit Application Bead 80 to 264Vac 0.22μF 2200pF YG 865C15R * 2 19V / 0 to 5A T1 470pF 7mH ～ ＋ 4.7μH 1M 220μF 400V 1M 250V/3A 4700pF ～ ー D3SBA60 470pF 56k 2200pF 3300μF * 3 35V ( 9900μF ) E R A38-06 FG 1000μF 35V E RA15-01 2SK3687 Cd 220pF Lp=360μH Np:Ns:Nsub=57:10:12 0.022μF 0.1μF 2k 200k 10 ohm 7.5k 4.7k 100 ohm 10k 18k 0.22 ohm SC902-2 National Semiconductor LMV431 100k 22pF 1000pF 4700pF 100 ohm 1 8 2 7 3 6 4 5 FA5531 2200pF 10k 0.01μF 15k 4.7 ohm E R A22-02 33μF 50V GND Quasi-Resonant IC FA5530/31/32 Valley Low dV/dt slope of Drain Voltage “Vds” TimingChart Chart((FA5531/32 FA5531/32)) Timing SwitchingFrequency Frequencyvs. vs.Output OutputPower Power Switching Valley Vds Frequency fsw Maximum Frequency : Vds 65kHzMax or 130kHz fsw (130kHz) Maximum 最大 fsw Frequency 1/130kHz 130kHz 130kHz 1/130kHz Valley Valley 信号 Signal Example: 1kHz (1kHz) Output PowerPo Po 最大fsw 低下 Maximum Period is (最小 1 / (Minimum 1kHz ) Frequency). Example :1kHz OUTOUT pin パルス voltage • Low frequency switching such as 1kHz at light load reduces standby power. • Maximum frequency limits EMI noise and switching Loss. 重負荷 Heavy Load 中負荷 Middle Load 軽負荷 Light Load • Switching at Valley of Vds : Turn-ON Loss and Noise are very small. • Low dV/dt of Vds at Turn-OFF by a capacitor connected between Drain and Source of Power MOSFET : Turn-OFF Loss and Noise are also very small. Quasi-Resonant IC FA5530/31/32 DemoBoard BoardData Data Demo Efficiency 効率特性 95 95 94 93 • Demo Board Specification Input Range : 80Vac to 264Vac Output Rating : 95W ( 19V / 5A ) 93 91 効率(%) • Demo Board Data 60mW to 140mW at no load, 0.9kHz Efficiency : 86 to 91% ( 20W to 95W ) → satisfies the standard of energy star Efficiency (%) 92 89 91 87 90 85 89 83 88 81 87 79 100Vac 100Vac 240Vac 240Vac 86 77 85 75 00 11 22 33 44 5 5 250 250 300 300 Io(A) Io (A) 無負荷時スイッチング周波数 Frequency at no load 1.01 140 140 0.9 0.9 0.8 0.8 0.7 0.7 0.6 0.6 0.5 0.5 0.4 0.4 0.3 0.3 0.2 0.2 0.1 0.1 00 120 120 Frequency (kHz) 100 100 fsw(kHz) Input Power (mW) Pin(mW) 無負荷時入力電力 Input Power at no load 160 160 80 80 60 60 40 40 20 20 00 50 100 100 150 150 200 200 Vin(Vac) 250 250 Input Voltage Vin (Vac) 300 300 50 50 100 100 150 200 150 200 Vin(Vac) Input Voltage Vin (Vac)