FA5532

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 (5µs) Reset CLR VCC Max. fsw Blanking Variable max.130kHz UVLO 5V Reg. Check 5V Reg. 9.85V/9.1V IS 5V Internal supply 20kΩ Current comparator FB 125k 125k Driver S R Q OUT 1V Disable ZCD Soft start (1ms) 8V OVP 2 VCC OVP 1 Timer latch (48µs) Reset 28V GND Quasi-Resonant IC FA5530/31/32 Application Circuit Application Circuit 80 to 264Va c 0 . 22 μF 1M 1M 25 0 V / A 3 FG E R A 15-01 2 S K 3 687 Cd 220 p F 4 70p F ～ー D3 S B A 6 0 470 p F 7m H ～＋ 4. 7 μH 220 μF 400 V 56 k 220 0 p F 33 0 0 μF * 3 35 V ( 9 9 0 0 μF ) 100 0 μF 35V 22 0 0 pF T1 Be a d 47 00 pF Y G 865C15R * 2 19V / 0 to 5 A E R A 3 8-06 Lp = 360 μH N p : N s : N s ub= 57: 1 0 : 1 2 0 . 022μF 2k 200 k 0. 1 μF GN D 7. 5 k 10 o h m 4. 7k 10k 18 k 0 . 22 o h m 220 0pF 100 o h m S C 90 2-2 Natio n al Se m ico n d u cto r LM V 4 3 1 4.7 o h m E R A 2 2 -0 2 10 k 0 . 0 1 μF 10 0k 10 0 o h m 1 2 3 4 8 7 6 5 33 μF 50 V 15 k 47 0 0 p F 1 000pF 22 pF FA 5 5 31 Quasi-Resonant IC FA5530/31/32 Low dV/dt slope of Drain Voltage “Vds” Switchin Frequ ncy vs. Output Powe SwitchinggFrequeencyvs. Output Powerr Vds Vd s Valley Timing Chart FA5531/32 Timing Chart ((FA5531/32 )) Valley Frequency fs w Maximum Frequency : 65kHz or x f s w Ma 130kHz ( 1 3 0 kH z) Maximum 最大 fsw Frequency Valley y V a lle 信号 Signal 11/130kH z 30k Hz 130 kH z 1/130kHz 最大 u w Period Maximfsm 低下 is (最小1k H z ) 1 / (Minimum Frequency). Example :1kHz Example: 1kHz kH z) (1 Output PowerPo Po OUT OUT pin パルス voltage 重負荷 Heavy Load 中負荷 Middle Load 軽負荷 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 効率特性 94 93 93 91 92 89 Efficiency (%) 効率(%) • 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 10 0V ac 24 0V ac 240Vac 0 0 1 1 2 2 Io (A ) 3 3 4 4 5 5 Io (A) 無負荷時入力電力 load Input Power at no 16 0 160 14 0 140 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 無負荷時スイッチング周波数 Frequency at no load Input Power (mW) Pin(mW) 80 80 60 60 40 40 20 20 0 0 50 100 100 50 150 200 20 0 250 2 50 300 300 fsw(kHz) 10 0 100 Frequency (kHz) 12 0 120 Input Voltage Vin (Vac) Vi n( Va c) 50 50 100 100 Input Voltage Vin (Vac) 150 200 1 50 20 0 Vi n( Va c) 250 250 300 30 0