LM3524DM datasheet(19/29 Pages) TI

Teilenummer	LM3524DM

Bauteilbeschribung	Regulating Pulse Width Modulator

PDF	29 Pages

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Hersteller	TI [Texas Instruments]

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LM2524D, LM3524D

www.ti.com

SNVS766E – JUNE 2009 – REVISED MAY 2013

Figure 28. Basic Step-Up Switching Regulator

Figure 29. Relation of Switch Timing to Inductor Current in Step-Up Regulator

(16)

Since

ΔIL+ = ΔIL−, VINtON = VotOFF − VINtOFF,

and neglecting VSAT and VD1

(17)

The above equation shows the relationship between VIN, Vo and duty cycle.

In calculating input current IIN(DC), which equals the inductor's DC current, assume first 100% efficiency:

(18)

for

η = 100%, POUT = PIN

(19)

This equation shows that the input, or inductor, current is larger than the output current by the factor (1 +

tON/tOFF). Since this factor is the same as the relation between Vo and VIN, IIN(DC) can also be expressed as:

(20)

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LM3524DM Datenblatt(PDF) 19 Page - Texas Instruments