LM3678 datasheet(2/18 Pages) TI1

Il numero della parte	LM3678

Spiegazioni elettronici	High-Performance Miniature 1.5-A Step-Down DC-DC Converter for Handheld Applications

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Produttore elettronici	TI1 [Texas Instruments]

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2 MHz

Oscillator

Soft

Start

Ramp

Generator

Thermal

Shutdown

Undervoltage

Lockout

Frequency

Compensation

+

-

Error

Amp

Control Logic

Driver

Current Limit

Comparator

Ref1

PFM Current

Comparator

Ref2

SW

Zero Crossing

Comparator

FB

EN

VIN

PWM Comparator

GND

Bandgap

+

-

VCOMP

1.0V

Fixed Ver

+

-

0.5V

+

-

+

-

VSELECT

PWM

PGOOD

VREF

LM3678

SNVS464B – APRIL 2008 – REVISED JANUARY 2009

www.ti.com

Functional Block Diagram

Figure 3. LM3678 Block Diagram

2

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