C. NELSON, "AN44 - LT1074/LT1076 Design Manual", Linear Technology, September 1991, 48 pages.
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Article : [DIV479]

Titre : C. NELSON, AN44 - LT1074/LT1076 Design Manual, Linear Technology, September 1991, 48 pages.

Cité dans : [DIV126]  T. LEQUEU, Librairie des fichiers PDF de composants, janvier 2018.
Cité dans :[REVUE244] ELEKTOR, revue N° 276, juin 2001.
Cité dans :[REVUE576] ELEKTOR, revue N° 325/326, juillet/août 2005.
Auteur : Carl Nelson

Source : Linear Technology
Pages : 1 - 48
Date : September 1991.
Lien : AN44fa.pdf - 48 pages, 437 Ko, Application Note 44, LT1074/LT1076 Design Manual, Carl Nelson, September 1991.
Lien : LT1074.pdf - 16 pages, 217 Ko, LT1074, LT1076, Step-Down Switching Regulator.
Lien : LT1074a.jpg - image, 38 Ko.

Vers : Introduction
Vers : TABLE OF CONTENTS

LT1074a.jpg - 24 Ko


Introduction

TOP

The use of switching regulators increased dramatically in
the 1980’s and this trend remains strong going into the
90s. The reasons for this are simple; heat and efficiency.
Today’s systems are shrinking continuously, while simultaneously
offering greater electronic "horsepower". This
combination would result in unacceptably high internal
temperatures if low efficiency linear supplies were used.
Heat sinks do not solve the problem in general because
most systems are closed, with low thermal transfer from
"inside" to "outside".
Battery powered systems need high efficiency supplies for
long battery life. Topological considerations also require
switching technology. For instance, a battery cannot gen-erate
an output higher than itself with linear supplies. The
availability of low cost rechargeable batteries has created
a spectacular rise in the number of battery powered
systems, and consequently a matching rise in the use of
switching regulators.
.


TABLE OF CONTENTS

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INTRODUCTION - AN44-1
ABSOLUTE MAXIMUM RATINGS - AN44-3
PACKAGE/ORDER INFORMATION - AN44-3
ELECTRICAL CHARACTERISTICS. AN44-3
BLOCK DIAGRAM - AN44-5
BLOCK DIAGRAM DESCRIPTION - AN44-6
TYPICAL PERFORMANCE CHARACTERISTICS - AN44-7
PIN DESCRIPTIONS - AN44-10
VIN Pin - AN44-10
Ground Pin. AN44-10
Feedback Pin - AN44-10
Shutdown Pin - AN44-11
Status Pin - AN44-13
ILIM Pin - AN44-14
Error Amplifier - AN44-15
DEFINITION OF TERMS - AN44-16
POSITIVE STEP-DOWN (BUCK) CONVERTER - AN44-17
Inductor - AN44-19
Output Catch Diode - AN44-19
LT1074 Power Dissipation - AN44-20
Input Capacitor (Buck Converter) - AN44-20
Output Capacitor - AN44-21
Efficiency - AN44-22
Output Divider - AN44-22
Output Overshoot - AN44-22
Overshoot Fixes that Don’t Work - AN44-23
TAPPED-INDUCTOR BUCK CONVERTER - AN44-23
Snubber - AN44-25
Output Ripple Voltage - AN44-26
Input Capacitor - AN44-26
POSITIVE TO NEGATIVE CONVERTER - AN44-26
Input Capacitor - AN44-28
Output Capacitor - AN44-29
Efficiency - AN44-30
NEGATIVE BOOST CONVERTER - AN44-31
Output Diode - AN44-32
Output Capacitor - AN44-32
Output Ripple - AN44-33
Input Capacitor - AN44-33
INDUCTOR SELECTION - AN44-33
Minimum Inductance to Achieve a Required Output Power - AN44-34
Minimum Inductance Required to Achieve a Desired Core Loss - AN44-35
MICROPOWER SHUTDOWN - AN44-38
Start-Up Time Delay - AN44-38
5-PIN CURRENT LIMIT. AN44-39
SOFT START - AN44-39
OUTPUT FILTERS - AN44-40
INPUT FILTERS - AN44-42
OSCILLOSCOPE TECHNIQUES - AN44-43
Ground Loops - AN44-43
Miscompensated Scope Probe - AN44-44
Ground "Clip" Pickup - AN44-44
Wires Are Not Shorts - AN44-44
EMI SUPPRESSION - AN44-45
TROUBLESHOOTING HINTS. AN44-46
Low Efficiency - AN44-46
Alternating Switch Timing - AN44-46
Input Supply Won’t Come Up - AN44-46
Switching Frequency Is Low In Current Limit - AN44-46
IC Blows Up! - AN44-46
IC Runs Hot - AN44-47
High Output Ripple or Noise Spikes - AN44-47
Poor Load or Line Regulation - AN44-47
500kHz-5MHz Oscillations, Especially at Light Load - AN44-47


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