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LM21215

更新时间： 2024-09-16 12:20:19

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描述
Evaluation Board provides a solution to examine the high efficiency

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LM21215 数据手册

National Semiconductor

Application Note 2130

Michael Hartshorne

March 29, 2011

LM21215 Evaluation Board

The LM21215 evaluation board has been optimized to work

from 2.95V to 5.5V, achieving a balance between overall so-

lution size and regulator efficiency. The evaluation board

measures just over 2” x 2” on a four layer PCB, and exhibits

a junction-to-ambient thermal impedance (θ_JA) of 24°C/W

with no air flow. The power stage and compensation compo-

nents of the LM21215 evaluation board have been optimized

for an input voltage of 5V, but for testing purposes, the input

can be varied across the entire operating range. The output

voltage of the evaluation board is nominally 1.2V, but this

voltage can be easily changed to any voltage between 0.6V

and V_INby modifying the feedback resistor network.

Introduction

This evaluation board provides a solution to examine the high

efficiency LM21215 buck switching regulator. The LM21215

is capable of driving up to 15A of continuous load current with

excellent output voltage accuracy due to its ±1% internal ref-

erence. The LM21215 is capable of down converting from an

input voltage between 2.95V and 5.5V at a fixed switching

frequency of 500 kHz. This device also features an adjustable

current limit that allows the user to set the internal current limit

protection value. Other fault protection features include out-

put power good and output over-voltage protection. The dual

function soft-start/tracking pin can be used to control the start-

up response of the LM21215, and the precision enable pin

can be used to easily sequence the LM21215 in applications

with sequencing requirements.

Evaluation Board Schematic

30154001

301540

www.national.com

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