FA5530 ETC2

Document overview

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Technical content

Quasi-Resonant IC FA5530/31/32 Features FA5531 Block DiagramFeaturesFeatures FA5531 Block DiagramFA5531 Block Diagram

  • Internal start-up circuit with 500V rating and low frequency operation achieves 140mW input at no load.
  • Small Output Capacitance : Linearly reduced frequency for lighter load causes small ripple voltage.
  • Suitable for Low Noise and High Efficiency about 90%
  • Line-up of 3 types for maximum frequency and OLP 5530: 65kHz max.,16Vmax.-VCC,Auto-restart OLP 5531:130kHz max.,28Vmax.-VCC,Auto-restart OLP 5532:130kHz max.,28Vmax.-VCC,Timer-Latched OLP
  • High ability of driving Power MOSFET ( High / Low side : 17 ohm / 3.5 ohm ) : available to 200W output
  • Vcc rating 28V allows no series regulator for auxiliary winding to clamp Vcc voltage for FA5531/32.
  • 1ms Fixed Soft Start time
  • Timer Latched Over-Voltage Protection of 16V/28V Vcc
  • 8 pins package ( DIP/SO ) Usage : Notebook PC, LCD Monitor, LCD-TV etc. Valley detection Time out (5µs) 1 shot (380ns) Max. fsw Blanking S R Q Soft start (1ms) Start up Current UVLO VH VCC 5V Reg.5V Reg. Check Internal supply Driver OUT Timer latch (48µs) Start up management Logic Reset Variable max.130kHz Current comparator 0.4V 3.3V Overload Disable 28V VCC ZCD OVP 1 OVP 2 9.85V/9.1V Reset CLR GND FB IS ZCD Timer 190ms 1510ms 20kΩ 125k 125k 50uA

Quasi-Resonant IC FA5530/31/32 Application CircuitApplication CircuitApplication Circuit 250V/3A 0.22μF 470 pF 470p F D3SBA60 220 μF 400 V 2SK3687 4.7k 0.22 ohm 33μF 50V ERA 22-02 2200pF YG865C15R * 2 3300μF * 3 35V 4.7μH 100 0μF 35V 0.022μ F 10k 10k 0.01μF 15k 18k 200 k FG 80 to 264V ac 19V / 0 to 5A GN D 100 ohm 10 ohm SC902-2 1000pF 100 ohm Cd 220 pF ー Lp=360 μH Np:Ns:Nsub= 57: 10:12 7.5k 4.7 ohm 100k 22pF FA5531 ERA15-01 220 0pF56k ERA38-06 4700pF 220 0pF 0.1μF Bead 4700pF National Semiconductor LMV431 ( 9900μF ) 7m H

Quasi-Resonant IC FA5530/31/32 Valley Switching Frequency vs. Output Power Timing Chart ( FA5531/32 )Timing Chart ( FA5531/32 ) Po fsw Ma x fsw (130kH z) (1kH z) Vds 最大 fsw Valley 信号 130k Hz 130 kH z 最大fsw低下 (最小1kHz) OUT パルス 重負荷 中負荷 軽負荷 Frequency Example: 1kHz Maximum Frequency : 65kHz or 130kHz Output Power Po Maximum Frequency Vds Valley Signal OUT pin voltage Heavy Load Light Load Middle Load 1/130kHz 1/130kHz Maximum Period is 1 / (Minimum Frequency). Example :1kHz

  • Low frequency switching such as 1kHz at light load reduces standby power.
  • Maximum frequency limits EMI noise and switching Loss.
  • 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. Valley Low dV/dt slope of Drain Voltage “Vds” Switching Frequency vs. Output Power

Quasi-Resonant IC FA5530/31/32 効率特性 012 345 Io(A) 効率(%) 100Vac 240Vac 無負荷時入力電力 100 120 140 160 50 100 150 200 250 300 Vin(Vac) Pin(mW) 無負荷時スイッチング周波数 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 50 100 150 200 250 300 Vin(Vac) fsw(kHz)

  • Demo Board Specification Input Range : 80Vac to 264Vac Output Rating : 95W ( 19V / 5A )
  • Demo Board Data 60mW to 140mW at no load, 0.9kHz Efficiency : 86 to 91% ( 20W to 95W ) → satisfies the standard of energy star Demo Board DataDemo Board DataDemo Board Data Efficiency Efficiency (%) Io (A) Frequency at no load Frequency (kHz) Input Voltage Vin (Vac) 50 100 150 200 250 300 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1 2 3 4 5 50 100 150 200 250 300 Input Voltage Vin (Vac) 160 140 120 100 Input Power (mW) Input Power at no load 100Vac 240Vac