Free Redacted Document - District Court of Delaware - Delaware

Case 1 :04-cv-01371-JJ F Docu ment 228-7 Filed O3/24/2006 Page 1 of 2
Ig PRODUCT INNOVATION
OWEI"' 0IIVEl‘$IOIl lp UTS IIEI`Qy u
= • •
Wusluge In Off- Line Switchers
High-Voltage Controller Enables Energy-Ejjlczent, Economical
` Alternatives 7bAC Wall Adapters And Standby Power Supplies. . .
Ashok Bindro . 'T -
I hile the eficiencies of power- I catching momentum Europe. { on-chip a 700-V power MOSFET) os-
conversion chips and power I 'Ib enables new class of energy-et? I cillator; high—voltage, switched-cun
sources continue to improve, { Ecient off-line ac adatpers and stand- Q rent source; current limit; and thermal ;
energy wastage in stand-by modere- { by power supplies, Power Integra-,{ shutdown circuitry (Fig. 2). Unlike , ’
_ mains astonis ’ ly high. For exam- { tions Inc. has crafted a radically new I the conventional PWM controller it _ -
I 1
ple, acwall adapters are still plugged I switcher solution for low-power (10 { uses an on/cH control to regulate the _
in and consume power, even though I W and below) applications (Fig. 1). I output voltage. In this scheme, when
gadgets like'i'Vs, VCRs, and cordless { And, at the heart of this solution is a I the on-chip oscillator is enabled, it { ”
phones are supposedly oft'. And, the { proprietary controller chip called { turns the power MOSFET on at the _
problemis expected to worsen as • TinySwitch. ` · start of each cycle. The MOSFET is. {
more electronic consumer products I “This new design reduces the en- I turned-off as soon u the output cur- 4
pervade the home. . I ergy wastage from the 1.2 W (typical) I rent reaches the upper » ·
This wasted energy costs money, Q seen in,today’s conventional, linear; ac I The maximum on-time of tbepower T _ _
" ‘ ’ aswell as contributes to pollution. Ao-"{‘wall·adapters (or bricks) to less than- { MOSFE'l‘·is determined by the duty. -~·-·-- ie
cording to a study conducted by { 100 mW," says Shyam Duiari, director { cycle signal (Dug;) ofthe intmnal os·
Lawrence Berkeley National Lahore- { of marketing at Power Integmtions. { cillator. Also, the current limit and
tory3Berkeley,Calif.,int1xeUaS. alone, I Plus, he adds, it provides a compact, I switching frequency for a given-
consumers pay over $3.5 billion annu- 5 lightweight adapter or stand—by sup- E '11nySwitch la Exed, while the power _· J ~
allytokeepavariety of electronlcwid- { ply with universalinput. Because : delivered is proportional to the pri-. ‘ lay; [gym;
gets in stand-by mode. To ciu·b such { fewer low-cost external components { mary inductance of the trarisformet Hmm {3 '
wastage, several en ergy-saving { are needed with this solution, the total { Because the 'I‘InySwitch is powered · . a cu
guidelines have been established I system cost is also signiiicantly cut, I directly by the incoming high voltage. md HH"! ana":
V around the world. The U.S. Energy I notes Dujari. By comparison, pulse- I it eliminates the need for an auxiliary (cm) WW Sli
Star program, for example, has been {width-modulated (PWM) based off- E bias winding and associated circuitm .‘*l'a°¥ video inf
extended to consumer electronics, { line switchers are bulky and cost { thereby simplifying the design of the Moa control 1
with efforts underway to cover home '. more, according to Dujeri. * transformer: In fact, the manufactuw · thnplnq Ior an
audio and DVD players. Likewise, I Designedto be a simple, on/of con- I recommends sta.nda1·d,-low—costtmnSr- luv qpemqo,
, Germany'a Blue_Angel legislation is Itroldevioe, the’IinySwitch integrates I formers based on ferrite cores lik¢ { qw stm came
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Case 1 :04-cv-01371-JJF Document 228-7 Filed O3/24/2006 Page 2 of 2
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ple sources. { goes under 70°C, at which point it`is { kHz to minimize EMI tiltering rc- · _
` ` ‘ · re-enabled. - · quirements, and permit the use of s ‘
» Novclbperafion · _ t { Under no·1oad condition, the; simple snpbber clamp tolimit drain
_ The very-high loop bandwidth of { 'I‘inySwitch consumes only 30 to 60 { spike voltage; ·
the device provides excellent tran- I mWat115/250-VacinpuLAsares1ilt, { However, the TNY255 uses.: .
sient response and fastturn-on, with { stand-by supplies based on the { higherswitclungfxequencyof 130kHz
. practically no overshoot, claims Du- { 'I‘inySwitch um meet Blue Angel, En- { deliver up-to 10 W for applications { ;__ __
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{ Plus, he adds, the Exed current·limit { integration of a high-voltage MOS- { cflow-cost, EE16 core transformers _ - .
operation rejects the line ripple, asthe { FET switch with low-voltage control { Typical conversion eiclency offered ¤ { '
. enugydelivered isindependent ofthe { and protection functions is made pos- { by a TinySwitch-based power cone .
input voltage-(Fig. 3). Other features { sible by the company’s proprietary { verteris70%rto-75*fv. ' -?
{ include glitch-free output when the { CMOS process. { “The efficiency {s constant all ze -’‘· »
; input is removed, and thermal protec- ' The TN Y253I254/255 are the Ent { way down to very- ow power,i’ sta S
{ tion. No loop compensationis needed. { three members of the 'I‘inySwitch { Power Integrations’ vice presidentvf j ·
Thethermal shutdown thnesholdisset { family. Aimed at TV/VCR stand~by { engineering, Balu Balakr{shnan.S;¤ _ ’_.__
{ at135°C,with 70°Chysteresis.Conse~ · so1utions,theTNY253is1·atedfor5-W · PWM-based swiu:hers,the ossa V J _
i quently, when the junction tempera— { supplies. Likewise, TNY254 delivers E tixedgas a result, the ehiciency goes f
f ture exceeds 135°C, the power MOS- { up to 8 W for cellular phone chargers { down with load, Balakrishnan says: BY ·
E FET is disabled. It remains disabled I and PC stand-by supplies. Both the { comparison, he adds, the 'l'i.nySuntc{{
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