Lowest Cost， Low Power Switcher Solution ? Lower cost than RCC， discrete PWM and other integrated/hybrid solutions ? Cost effective replacement for bulky linear adapters ? Lowest component count ? Simple ON/OFF control – no loop compensation devices ? No bias winding – simpler， lower cost transformer ? Allows simple RC type EMI filter for up to 2 W from universal input or 4 W from 115 VAC input Extremely Energy Efficient ? Consumes only 30/60 mW at 115/230 VAC with no load ? Meets Blue Angel， Energy Star， Energy 2000 and 200mW European cell phone requirements for standby ? Saves $1 to $4 per year in energy costs （at $0.12/kWHr） compared to bulky linear adapters ? Ideal for cellular phone chargers， standby power supplies for PC， TV and VCR， utility meters， and cordless phones. High Performance at Low Cost ? High voltage powered – ideal for charger applications ? Very high loop bandwidth provides excellent transient response and fast turn on with practically no overshoot ? Current limit operation rejects line frequency ripple ? Glitch free output when input is removed ? Built-in current limit and thermal protection ? 44 kHz operation （TNY253/4） with snubber clamp reduces EMI and video noise in TVs & VCRs ? Operates with optocoupler or bias winding feedback