TK65025MBX/M25 데이터 시트보기 (PDF) - Toko America Inc

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TK65025MBX/M25

STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR

Toko America Inc  

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.

TK65025

2

February, 1997 Toko, Inc.

Page 9

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