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LM2670SX-ADJ 데이터시트(PDF) 10 Page - Texas Instruments |
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LM2670SX-ADJ 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 38 page 10 LM2670 SNVS036K – APRIL 2000 – REVISED JUNE 2016 www.ti.com Product Folder Links: LM2670 Submit Documentation Feedback Copyright © 2000–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LM2670 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 3 A, and highly efficient operation. The design support WEBENCH, can also be used to provide instant component selection, circuit performance calculations for evaluation, a bill of materials component list and a circuit schematic for LM2670. 7.2 Functional Block Diagram * Active Inductor Patent Number 5,514,947 † Active Capacitor Patent Number 5,382,918 7.3 Feature Description 7.3.1 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/Time OFF) of the power switch is proportional to the ratio of the power supply output voltage to the input voltage. The voltage on pin 1 switches between VIN (switch ON) and below ground by the voltage drop of the external Schottky diode (switch OFF). |
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