The progress of semiconductor technology reduces circuit size ceaselessly, a jotter can achieve the large computer performance that once deposited with ability of a big room today, of integrated circuit compositive degree of scale that has attained odd chip to count transistor. However, semiconductor technology advances triumphantly to appear to always ” of cuss of demon of a few “ is done away with hard however all the way, include capacitance, inductance, smooth Ou and transformer of such passive parts of an apparatus compositive do not have apparent breakthrough all the time, especially size is enormous but the transformer with wide application became switch power source to design an engineer all the time the nightmare since, all sorts of handicap of …… of radiate of large size, tall power comsumption, EMI, ripple very closely associated with each other.

 

Regard high-powered imitate technology as the provider, the ” of “ demon barrier that ADI is trying to break through technologies of these block up imitate to progress all the time, the transformer with the will traditional technique of ICoupler magnetism segregation of its research and development came true with standard semiconductor workmanship compositive, will traditional adoption the mechanical transformer of magnetism core piece on change, and have the advantage such as tall bandwidth, low inductance and tall impedance. ADI company uses small transformer to design the experience of the respect, development gave series of IsoPower of converter of power of chip class DC-DC. Recently, ADI releases IsoPower series to be tasted newly again, achieve the target of crucial function EMI of the product ” of “ great leap forward, magnetism segregation solved past EMI further on traditional performance dominant position short board, implementation fish and bear’s paw can get the end that hold concurrently.

 

Keep apart block diagram of signal of radiate of power source EMI

 

The 2nd generation overcomes framework of revolutionary power source EMI is short board

ADI magnetism keeps apart the technical experience development via nearly 20 years, most initial product is signal segregation. The characteristic that magnetism keeps apart is it contains full capabilities, be based on this technology rolled out again after ADI is old inside the chip class power source of buy transformer keeps apart a product, semiconductor device follows in pure workshop as common chip same production comes out, is not to resemble traditional scattered machinery component is assembled and be being become.

 

The 2nd acting technology satisfied radio to disturb characteristic CISPR 22/EN 55022 B kind radiation level

 

The characteristic with particularly small size of generation technology is “ everybody is welcomed, but weakness is apparent also ——EMI is not very good, radiation is bigger. Because the coil size of chip class is very small, its working frequency is particularly so tall, when the working frequency of hundreds million expresses energy to segregation to take, have a few necessarily in all modular signal or noise is met radiation goes out. ”Chen Jie of manager of department of product of ADI number isolator expresses in a speech. Past ADI engineer also offerred an amendatory the means to these problems, if suggest in segregation chip two upright bond bring compasses electric capacity, offer the feedback way of a foundation to it with capacitance, the lining that perhaps uses 4 Pcb should do to hand in fold form capacitance character, the feedback way that offers a low impedance thereby will restrain EMI.

 

“ but apparently, these two kinds of methods can bring a few troubles to the client more or less. So, group of our research and development overcomes this problem in effort all the time, we the problem that present the 2nd acting product solved this EMI successfully from chip itself. ” Chen Jie explains. The 2nd acting product was done on the design of coil a few improve, symmetry is better, increase enlarge frequency on frequency spectrum, original spectrum the enlarge of aiguille peak value of working frequency leaves. “ can see so is a bit odder aiguille, the means that uses enlarge frequency now developed it, fall energy. ” Chen Jie points out, new index can reach the radiation level of Class A, Class B easily. “ uses the 2nd acting technology not to need to do any bond capacitance processing, can use two Pcb board only, in output end increases two magnetism bead and two electric capacity can. ” Chen Jie expresses.

 

2 Pcb use when 100mA: Exact peak value satisfies CISPR 22 B kind standard, quantity of the abundant when 915MHz is – 5.1dBμV

 

The 2nd acting product in old nimble mouth is ADI announced to roll out recently its are new generation enhances ADuM5020/6020 of converter of segregation type power source and ADuM5028/6028 series, can make the system satisfies EN 55022/CISPR 22 B kind the demand of electromagnetism interference standard, the EMI that need not use high cost in applied level restrains a technology, and can simplify EMI attestation flow, reduce a design cost and shorten design time. The key of the ” of “ division of history into periods that ADI keeps apart his the product consults index is put on EMI character, after generation is rolled out to keep apart power source more than 10 years ago ADI rolled out a certain number of series to be tasted newly in succession, but because was not done in EMI respect,be optimized too much and still attributive generation product. As the industry characteristic to EMI attention is spent taller and taller, ADI threw a few people to use two years time, finished arrive from research and development craft, enclose, test, complete complete research and development of product of new generation low EMI.

 

Compositive change a trend to fall, passageway segregation demand appears on the stage again rank

Power source segregation is compositive change a trend to had been formed, the industry waits in appearance of control of car of new energy resources, industry, instrument and medical treatment, more and more wanting that use tall compositive keep apart between spent passageway and passageway. For instance we see “ the equipment of some temperature sampling, it is likely 8 on a bat 8 passageways, ADC, want to do segregation, signal to want to keep apart to this ADC, keep apart power source even, that keeps apart chip this kind with us particularly convenient. ” Chen Jie points out, “ has some of high end product to ask to want to keep apart between every passageway namely now, it cannot common keep apart power source. The miniaturization trend of ” instrument industry also is promoting the demand of compositive segregation power source to increase, also begin to raise taller requirement to keeping apart function on a few portable medical treatment equipment even.

 

Simplify the ADuM5020/ADuM5028 of two Pcb layout is evaluated board

 

“ for example the level that medical treatment can have taller segregation order and degree this piece, the segregation order and degree of ADuM6000 series and ADuM6020 is higher. Additional, taller and taller also to radiant requirement like car application, so we hope to be able to go up to be restrained further in radiant energy, have larger abundant amount. ” Chen Jie expresses, we still did “ a smaller SO8 is enclosed, can calls industry solution of the smallest segregation power source. Additional, because the power of this technology output is not very big, although tile of present 500 fine long hair can have satisfied a lot of application, but ADI may develop in the future toward greater output power. ”

 

Challenge smooth Ou traditional market successfully, magnetism segregation goes strong continuously
 

Regard a kind of the most traditional segregation as means, smooth Ou already exceeded 50 years in the application on market, return occupational mainstream to apply in a lot of circumstances at present. Whether is the biggest handicap of EMI of breakthrough of product of power source of the 2nd acting segregation keeping apart ADI does power source exhibit boxing foot, take cities and seize territory greatly? “ keeps apart application normally as direct as safety and product function attestation relevant, bring about the market to adopt deflection to guard to new technology, the market of new product and technology is permeated and switch will be slower than other product, this is the characteristic of this market. ” Chen Jie expresses.

 

However the marked weakness of smooth Ou these year offerring for new-style segregation technology cut a point, keeping apart a the biggest question at magnetism relatively especially is compositive spend difference. “ does much passageway to keep apart days Ou technology especially individual enclose do not come true, must be a passageway a parts of an apparatus, and digital magnetism segregation is OK will 3, 4 are 6 passageways even put in to enclose in. ” Chen Jie points out. In fact, power source segregation also faces such technical difference, deliver power source energy without method solely especially, and it is OK that magnetism is lain between. The application that will tell it from technical itself is more agile, compositive degree taller.

 

The market share that more and more application are digital isolator for certain meets “ future to expand further, the market of smooth Ou is met somewhat atrophic. But digital isolator replaces smooth Ou completely impossibly also, because smooth Ou is in,the circumstance of low cost, low rate has its advantage. Calm of ” Chen Jie old. Disclose according to him, in the application under 1MBPS, the price of smooth Ou and its communication speed show correlation of index, arrived for instance 1M even 10MBPS above, its price is a lot of higher than digital segregation, but when low speed cost is very low. Digital isolator won’t touch “ has some of market certainly so, but development trend of future is speed for certain faster and faster, dominant position of new point of growth, new market number isolator is so clearer and clearer. ” Chen Jie expresses.