LM2575HV datasheet(23/27 Pages) NSC

Teilenummer	LM2575HV

Bauteilbeschribung	SIMPLE SWITCHER 1A Step-Down Voltage Regulator

PDF	27 Pages

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Hersteller	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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23 / 27 page

Definition of Terms (Continued)

CONTINUOUS/DISCONTINUOUS MODE OPERATION

Relates to the inductor current. In the continuous mode, the

inductor current is always flowing and never drops to zero,

vs. the discontinuous mode, where the inductor current

drops to zero for a period of time in the normal switching

cycle.

INDUCTOR SATURATION

The condition which exists when an inductor cannot hold any

more magnetic flux. When an inductor saturates, the induc-

tor appears less inductive and the resistive component domi-

nates. Inductor current is then limited only by the DC resis-

tance of the wire and the available source current.

OPERATING VOLT MICROSECOND CONSTANT (E

•T

op)

The product (in VoIt

•µs) of the voltage applied to the inductor

and the time the voltage is applied. This E

•T

op constant is a

measure of the energy handling capability of an inductor and

is dependent upon the type of core, the core area, the

number of turns, and the duty cycle.

LM2575HV Datenblatt(PDF) 23 Page - National Semiconductor (TI)