TNY254P制作手机充电器电路

上图中的电路图,是一个使用TNY254P IC构成的手机充电路电路,提供6.7V的电压、0.56A电路的手机电池恒流充电器电路

TNY254P的说明如下

Lowest Cost, Low Power Switcher Solution

• Lower cost than RCC, discrete PWM and otherintegrated/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 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 transientresponse 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

Description

The TinySwitch family uses a breakthrough design to provide the lowest cost, high efficiency, 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.

The TNY253 and TNY254 switch at 44 kHz to minimize EMI and to allow a simple snubber clamp to limit DRAIN spike voltage. At the same time, they allow use of low cost EE16 core transformers to deliver up to 5 W. The TNY253 is identical to TNY254 except for its lower current limit, which reduces output short circuit current for applications under 2.5 W.

TNY255 uses higher switching rate of 130 kHz to deliver up to 10 W from the same low cost EE16 core for applications such
as PC standby supply. An EE13 or EF13 core with safety spaced bobbin can be used for applications under 2.5 W.

Absence of a bias winding eliminates the need for taping/ margins in most applications, when triple insulated wire is used
for the secondary. This simplifies the transformer constructionand reduces cost.

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