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LM3481-Q1 Datasheet(PDF) 20 Page - Texas Instruments

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Part No. LM3481-Q1
Description  LM3481 / -Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3481-Q1 Datasheet(HTML) 20 Page - Texas Instruments

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background image
+
+
PWM
VOUT
VIN
+
VIN
L
L
RLOAD
+
-
VOUT
+
VIN
L
RLOAD
+
-
VOUT
D1
D1
COUT
COUT
Q
COUT
LM3481, LM3481-Q1
SNVS346F – NOVEMBER 2007 – REVISED NOVEMBER 2014
www.ti.com
Typical Applications (continued)
A.
First Cycle of Operation
B.
Second Cycle of Operation
Figure 31. Simplified Boost Converter Diagram
8.2.1.1 Design Requirements
To properly size the components for the application, the designer needs the following parameters: Input voltage
range, output voltage, output current range and required switching frequency. These four main parameters will
affect the choices of component available to achieve a proper system behavior.
8.2.1.2 Detailed Design Procedure
8.2.1.2.1
Power Inductor Selection
The inductor is one of the two energy storage elements in a boost converter. Figure 32 shows how the inductor
current varies during a switching cycle. The current through an inductor is quantified as:
(21)
20
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Copyright © 2007–2014, Texas Instruments Incorporated
Product Folder Links: LM3481 LM3481-Q1


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