LM3407 datasheet(11/22 Pages) TI1

Il numero della parte	LM3407

Spiegazioni elettronici	Constant Current Output Floating Buck Switching Converter for High Power LEDs

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Produttore elettronici	TI1 [Texas Instruments]

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VISNS

VMSL

0

D/fSW

1/fSW

VRP

VREF

0

+

-

Error

Amplifier

D/fSW

1/fSW

PWM signal

Generator

D/fSW

1/fSW

VPWM

0

T

PWM

sawtooth

To power switch

VISNS1

VMSL

0

VISNS2

VMSL

0

VPWM

0

LM3407

www.ti.com

SNVS553B – JANUARY 2008 – REVISED MAY 2013

Figure 21. Pulse-Level Transformation

When VMSL is higher than VREF, the peak value of VRP, the switching duty cycle of the power switch will be

reduced to lower VMSL. When VMSL is lower than the peak value of VRP, the switching duty cycle of the power

switch will be increased to raise VMSL. For example, when IOUT is decreased, VMSL will become lower than VREF.

In order to maintain output current regulation, the switching duty cycle of the power switch will be increased and

eventually push up VMSL until VMSL equals VREF. Since in typical floating buck regulators VMSL is equal to IOUT *

RISNS, true average output current regulation can be achieved by regulating VMSL. Figure 23 shows the

waveforms of VISNS and VRP under closed loop operation.

Figure 22. Implementation of the PWM Switching Signal

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