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LMZ20502 bảng dữ liệu(PDF) 9 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  2A SIMPLE SWITCHER Nano Module
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LMZ20502
www.ti.com
SNVS852C – JUNE 2012 – REVISED APRIL 2015
8 Detailed Description
8.1 Overview
The LMZ20502 SIMPLE SWITCHER Nano Module is a voltage mode buck regulator with an integrated inductor.
Input voltage feed-forward is used to compensate for loop gain variation with input voltage. Two operating modes
allow the user to tailor the regulator to their specific requirements. In forced PWM mode, the regulator operates
as a full synchronous device with a 3 MHz (typ.) switching frequency and very low output voltage ripple. In AUTO
mode, the regulator moves into PFM when the load current drops below the mode change threshold (see
Application Curves). In PFM, the device regulates the output voltage between wider ripple limits than in PWM.
This results in much smaller supply current than in PWM, at light loads and high efficiency. A simplified block
diagram is shown in Functional Block Diagram.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Nano Scale Package
The LMZ20502 incorporates world class package technology to provide a 2 A power supply with a total volume
of only 21 mm3 (excluding external components). All that is required for a complete power supply is the addition
of feed-back resistors to set the output voltage and the input and output filter capacitors. Figure 7 and Figure 8
show the LMZ20502 package. The regulator die is embedded into a PCB substrate while the power inductor is
mounted on top. Vias and copper clad are used to make the connections to the die, inductor and the external
components. This package is MSL3 compliant.
Copyright © 2012–2015, Texas Instruments Incorporated
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