LM3410XMFE datasheet(24/49 Pages) TI

Teilenummer	LM3410XMFE

Bauteilbeschribung	525kHz/1.6MHz, Constant Current Boost and SEPIC LED Driver with Internal Compensation

PDF	49 Pages

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Hersteller	TI [Texas Instruments]

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VIN =

)

VOUT

VC3 =

)

VOUT

AREA

( )

(s)

§ D

IL1

and

§ '

ILED

LM3410, LM3410Q

SNVS541G – OCTOBER 2007 – REVISED MAY 2013

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(58)

Substituting IL1 into IL2

IL2 = ILED

(59)

The average inductor current of L2 is the average output load.

Figure 25. Inductor Volt-Sec Balance Waveform

Applying Charge balance on C1:

(60)

Since there are no DC voltages across either inductor, and capacitor C3 is connected to Vin through L1 at one

end, or to ground through L2 on the other end, we can say that

VC3 = VIN

(61)

Therefore:

(62)

This verifies the original conversion ratio equation.

It is important to remember that the internal switch current is equal to IL1 and IL2 during the D interval. Design the

converter so that the minimum ensured peak switch current limit (2.1A) is not exceeded.

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LM3410XMFE Datenblatt(PDF) 24 Page - Texas Instruments