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TK65025M Datasheet(PDF) 9 Page - TOKO, Inc |
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TK65025M Datasheet(HTML) 9 Page - TOKO, Inc |
9 / 12 page 2 February, 1997 Toko, Inc. Page 9 TK65025 rating equal to the converter output current rating plus the single cycle ripple current peak given by Eq. (4). With that guideline followed, the risk of saturation becomes only a dynamic problem. Under the situation of placing a dynamic load on the output of the converter, saturation may occur. Fortunately, unlike off-line powered converters, battery powered converters tend to be quite forgiving of dynamic saturation, due to the limitation of available power. Startup of the converter is an example of a practically unavoidable dynamic load change (complicated by an out- put operating point change) that can cause saturation of the inductor. However, this particular phenomenon applies to single cell powered converters, too - so saturation is not entirely avoidable, yet does not cause system problems. It is beyond the scope of this application note to quantify the practical limitations of allowed dynamic saturation and how stressful it may be to the various components involved. It is left to the user to examine empirically the dynamic satura- tion phenomenon and determine what performance is ac- ceptable. In most cases no problem will be exhibited. |
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