參數(shù)資料
型號(hào)： LM2670
廠商： National Semiconductor Corporation
英文描述： SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
中文描述： SIMPLE SWITCHER系列高效率3A降壓穩(wěn)壓器具有同步
文件頁(yè)數(shù)： 9/23頁(yè)
文件大?。?/td> 361K
代理商： LM2670
Application Hints
(Continued)
DESIGN CONSIDERATIONS
Power supply design using the LM2670 is greatly simplified
by using recommended external components. A wide range
of inductors, capacitors and Schottky diodes from several
manufacturers have been evaluated for use in designs that
cover the full range of capabilities (input voltage, output volt-
age and load current) of the LM2670. A simple design proce-
dure using nomographs and component tables provided in
this data sheet leads to a working design with very little ef-
fort. Alternatively, the design software,
LM267X Made
Simple
(version 2.0), can also be used to provide instant
component selection, circuit performance calculations for
evaluation, a bill of materials component list and a circuit
schematic.
The individual components from the various manufacturers
called out for use are still just a small sample of the vast ar-
ray of components available in the industry. While these
components are recommended, they are not exclusively the
only components for use in a design. After a close compari-
son of component specifications, equivalent devices from
other manufacturers could be substituted for use in an appli-
cation.
Important considerations for each external component and
an explanation of how the nomographs and selection tables
were developed follows.
INDUCTOR
The inductor is the key component in a switching regulator.
For efficiency the inductor stores energy during the switch
ON time and then transfers energy to the load while the
switch is OFF.
Nomographs are used to select the inductance value re-
quired for a given set of operating conditions. The nomo-
graphs assume that the circuit is operating in continuous
mode (the current flowing through the inductor never falls to
zero). The magnitude of inductance is selected to maintain a
maximum ripple current of 30% of the maximum load cur-
rent. If the ripple current exceeds this 30% limit the next
larger value is selected.
The inductors offered have been specifically manufactured
to provide proper operation under all operating conditions of
input and output voltage and load current. Several part types
are offered for a given amount of inductance. Both surface
DS100942-7
FIGURE 1. Basic circuit for fixed output voltage applications.
DS100942-8
FIGURE 2. Basic circuit for adjustable output voltage applications
www.national.com
9
相關(guān)PDF資料
PDF描述
LM2670T-3.3 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
LM2670T-5.0 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
LM2670T-ADJ SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
LM2670S-5.0 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
LM2670S-ADJ SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2670_05 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER㈢ High Efficiency 3A Step-Down Voltage Regulator with Sync
LM2670EP 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM2670EP Enhanced Plastic SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
LM2670LD-12 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:
LM2670LD-3.3 制造商:Rochester Electronics LLC 功能描述:3A STEP DOWN SIMP SWITCH 260KH - Bulk 制造商:Texas Instruments 功能描述:
LM2670LD-5.0 制造商:Rochester Electronics LLC 功能描述:3A STEP DOWN SIMP SWITCH 260KH - Bulk
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