开关电源设计范例Title Engineering Prototype Report 70 W (19 V 3.66A) Universal Input Adapter (EP11) Laptop Adapters, LCD Monitors, Audio, High Power Adapters Power Integrations Applications Dept. EPR-00011 22-January-2001 1.4 Target Applications Author Doc Num Date Revision Features Very compact design: (4.1” × 2.25” × 1.06”) High power density - 7 W / inch Full output power (70 W) in sealed enclosure at 40°C ambient High efficiency: 84% (85 VAC), 89% (230 VAC) Low no-load consumption: 350 mW (115 VAC), 500 mW (230 VAC) Low value input capacitor: 74% DCMAX and line feed forward allows 2 F/W Power limited during overload: overload output current less than 5 A at 19 V Primary side soft-start: minimizes component stresses during start-up Low EMI due to frequency jittering: meets CISPR22B wi……