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LM2672M-ADJ Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza LM2672M-ADJ
Descripción Electrónicos  LM2672 SIMPLE SWITCHER짰 Power Converter High Efficiency 1-A Step-Down Voltage Regulator with Features
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Fabricante Electrónico  TI1 [Texas Instruments]
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LM2672M-ADJ Datasheet(HTML) 11 Page - Texas Instruments

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Copyright © 2016, Texas Instruments Incorporated
11
LM2672
www.ti.com
SNVS136L – SEPTEMBER 1998 – REVISED JUNE 2016
Product Folder Links: LM2672
Submit Documentation Feedback
Copyright © 1998–2016, Texas Instruments Incorporated
9 Detailed Description
9.1 Overview
The LM2672 provides all of the active functions required for a step-down (buck) switching regulator. The internal
power switch is a DMOS power MOSFET to provide power supply designs with high current capability, up to 1 A,
and highly efficient operation.
The LM2672 is part of the SIMPLE SWITCHER® family of power converters. A complete design uses a minimum
number of external components, which have been pre-determined from a variety of manufacturers. Using either
this data sheet or TI's WEBENCH® design tool, a complete switching power supply can be designed quickly.
Refer to LM2670 SIMPLE SWITCHER® High Efficiency 3A Step-Down Voltage Regulator with Sync for additional
application information.
9.2 Functional Block Diagram
9.3 Feature Description
9.3.1 Switch Output
This is the output of a power MOSFET switch connected directly to the input voltage. The switch provides energy
to an inductor, an output capacitor and the load circuitry under control of an internal pulse-width-modulator
(PWM). The PWM controller is internally clocked by a fixed 260-kHz oscillator. In a standard step-down
application the duty cycle (time ON or time OFF) of the power switch is proportional to the ratio of the power
supply output voltage to the input voltage. The voltage on the VSW pin cycles between Vin (switch ON) and below
ground by the voltage drop of the external Schottky diode (switch OFF).


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