描述 Description

The TinySwitch family uses a breakthrough design to provide the lowest cost, high effciency, off-line switcher solution in the 0 to 10 W range. These devices integrate a 700 V power MOSFET, oscillator, high-voltage switched current source, current limit and thermal shutdown circuitry. They start-up and run on power derived from the DRAIN voltage, eliminating the need for a transformer bias winding and the associated circuitry. And yet, they consume only about 80 mW at no load, from 265 VAC input. A simple ON/OFF control scheme also eliminates the need for loop compensation.

Product Highlights

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 flter for up to 2 W from

universal input or 4 W from 115 VAC input

Extremely Energy Effcient

? Consumes only 30/60 mW at 115/230 VAC with no load

? Meets Blue Angel, Energy Star, Energy 2000 and 200 mW

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 and VCRs

? Operates with optocoupler or bias winding feedback