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| Quasi-Resonant IC FA5530/31/32 Features Features * 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. 3.3V 0.4V Overload Timer 190ms 1510ms 5V 50uA FA5531 Block Diagram FA5531 Block Diagram ZCD Valley detection 1 shot (380ns) Start up management Logic VH Start up Current Time out (5s) Reset CLR VCC Max. fsw Blanking Variable max.130kHz UVLO 5V Reg. Check 5V Reg. 9.85V/9.1V IS 5V Internal supply 20k Current comparator FB 125k 125k Driver S R Q OUT 1V Disable ZCD Soft start (1ms) 8V OVP 2 VCC OVP 1 Timer latch (48s) Reset 28V GND Quasi-Resonant IC FA5530/31/32 Application Circuit Application Circuit 80 to 264Vac 0.22F 1M 1M 250V/ 3A FG E RA15-01 2SK3687 Cd 220pF 470pF D3SBA60 470pF 7mH 4.7H 220F 400V 56k 2200pF 3300F * 3 35V ( 9900F ) 1000F 35V 2200pF T1 Bead 4700pF YG 865C15R * 2 19V / 0 to 5A E R A38-06 Lp=360H Np:Ns:Nsub=57:10:12 0.022F 2k 200k 0.1F GND 7.5k 10 ohm 4.7k 10k 18k 0.22 ohm 2200pF 100 ohm SC902-2 National Semiconductor LMV431 4.7 ohm E R A22-02 10k 0.01F 100k 100 ohm 1 2 3 4 8 7 6 5 33F 50V 15k 4700pF 1000pF 22pF FA5531 Quasi-Resonant IC FA5530/31/32 Low dV/dt slope of Drain Voltage "Vds" Switching Frequency vs. Output Power Switching Frequency vs. Output Power Vds Vds Valley Timing Chart FA5531/32 Timing Chart ((FA5531/32 )) Valley Frequency fsw Maximum Frequency : 65kHz or 130kHz Max fsw (130kHz) Maximum fsw Frequency Valley Valley Signal 1/130kHz 130kHz 130kHz 1/130kHz fsw Maximum Period is (1kHz) 1 / (Minimum Frequency). Example :1kHz Example: 1kHz (1kHz) Output PowerPo Po OUT OUT pin voltage Heavy Load Middle Load Light Load * 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. Quasi-Resonant IC FA5530/31/32 Demo Board Data Demo Board Data 95 95 Efficiency 94 93 93 91 92 89 Efficiency (%) (%) * 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 91 87 90 85 89 83 88 81 87 79 86 77 85 75 100Vac 100Vac 240Vac 240Vac 0 0 1 1 2 2 Io(A) 3 3 4 4 5 5 Io (A) load Input Power at no 160 160 140 140 1.0 1 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 0 0 Frequency at no load Input Power (mW) Pin(mW) 80 80 60 60 40 40 20 20 0 0 50 100 100 150 150 200 200 250 250 300 300 fsw(kHz) 100 100 Frequency (kHz) 120 120 Input Voltage Vin (Vac) Vin(Vac) 50 50 100 100 Input Voltage Vin (Vac) 150 200 150 200 Vin(Vac) 250 250 300 300 |
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