データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

LM22679 データシート(PDF) 10 Page - Texas Instruments

部品番号 LM22679
部品情報  LM22679/-Q1 42-V, 5-A SIMPLE SWITCHER짰 Step-Down Voltage Regulator With Features
Download  27 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM22679 データシート(HTML) 10 Page - Texas Instruments

Back Button LM22679_15 Datasheet HTML 6Page - Texas Instruments LM22679_15 Datasheet HTML 7Page - Texas Instruments LM22679_15 Datasheet HTML 8Page - Texas Instruments LM22679_15 Datasheet HTML 9Page - Texas Instruments LM22679_15 Datasheet HTML 10Page - Texas Instruments LM22679_15 Datasheet HTML 11Page - Texas Instruments LM22679_15 Datasheet HTML 12Page - Texas Instruments LM22679_15 Datasheet HTML 13Page - Texas Instruments LM22679_15 Datasheet HTML 14Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 27 page
background image
100
1k
10k
100k
1M
10M
0
5
10
15
20
25
30
35
40
FREQUENCY (Hz)
-ADJ
-5.0
LM22679, LM22679-Q1
SNVS581L – FEBRUARY 2013 – REVISED NOVEMBER 2014
www.ti.com
Feature Description (continued)
Figure 10. Compensator Gain
In general, hand calculations or simulations can only aid in selecting good power stage components. Good
design practice dictates that load and line transient testing should be done to verify the stability of the application.
Also, Bode plot measurements should be made to determine stability margins. AN-1889 How to Measure the
Loop Transfer Function of Power Supplies (SNVA364) shows how to perform a loop transfer function
measurement with only an oscilloscope and function generator.
7.4 Device Functional Modes
7.4.1 Shutdown Mode
The LM22679 device incorporates an input undervoltage lock-out (UVLO) feature. This prevents the regulator
from turning on when the input voltage is not great enough to properly bias the internal circuitry. The rising
threshold is 4.3 V (typ) while the falling threshold is 3.9 V (typ).
7.4.2 Active Mode
The LM22679 is in Active Mode when VIN is above its UVLO level. See UVLO for more information on the UVLO
level.
7.4.3 Current Limit
The LM22679 device has current limiting to prevent the switch current from exceeding safe values during an
accidental overload on the output. This peak current limit is found in the Electrical Characteristics table under the
heading of ICL. The maximum load current that can be provided, before current limit is reached, is determined
from Equation 4.
(4)
Where:
L is the value of the power inductor.
When the LM22679 enters current limit, the output voltage will drop and the peak inductor current will be fixed at
ICL at the end of each cycle. The switching frequency will remain constant while the duty cycle drops. The load
current will not remain constant, but will depend on the severity of the overload and the output voltage.
For very severe overloads ("short-circuit"), the regulator changes to a low frequency current foldback mode of
operation. The frequency foldback is about 1/5 of the nominal switching frequency. This will occur when the
current limit trips before the minimum on-time has elapsed. This mode of operation is used to prevent inductor
current "run-away", and is associated with very low output voltages when in overload. Equation 5 can be used to
determine what level of output voltage will cause the part to change to low frequency current foldback.
10
Submit Documentation Feedback
Copyright © 2013–2014, Texas Instruments Incorporated
Product Folder Links: LM22679 LM22679-Q1


同様の部品番号 - LM22679_15

メーカー部品番号データシート部品情報
logo
National Semiconductor ...
LM22679TJ-5.0 NSC-LM22679TJ-5.0 Datasheet
386Kb / 16P
   5A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit
LM22679TJ-ADJ NSC-LM22679TJ-ADJ Datasheet
386Kb / 16P
   5A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit
LM22679TJE-5.0 NSC-LM22679TJE-5.0 Datasheet
386Kb / 16P
   5A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit
LM22679TJE-ADJ NSC-LM22679TJE-ADJ Datasheet
386Kb / 16P
   5A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit
More results

同様の説明 - LM22679_15

メーカー部品番号データシート部品情報
logo
Texas Instruments
LM22677 TI-LM22677_15 Datasheet
1Mb / 28P
[Old version datasheet]   LM22677/-Q1 42-V, 5-A SIMPLE SWITCHER짰, Step-Down Voltage Regulator With Features
LM22675 TI-LM22675_15 Datasheet
1Mb / 26P
[Old version datasheet]   LM22675/-Q1 42 V, 1 A SIMPLE SWITCHER짰 Step-Down Voltage Regulator with Features
LM22676 TI-LM22676_15 Datasheet
1Mb / 29P
[Old version datasheet]   LM22676/-Q1 42 V, 3 A SIMPLE SWITCHER짰 Step-Down Voltage Regulator with Features
LM22673 TI-LM22673_15 Datasheet
1Mb / 29P
[Old version datasheet]   LM22673/-Q1 42 V, 3 A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Features
LM22670 TI-LM22670_15 Datasheet
1Mb / 32P
[Old version datasheet]   LM22670/-Q1 42 V, 3 A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Features
LM22674 TI-LM22674_15 Datasheet
1Mb / 26P
[Old version datasheet]   LM22674/-Q1 42 V, 500 mA SIMPLE SWITCHER짰 Step-Down Voltage Regulator with Features
LM22671 TI-LM22671_15 Datasheet
1Mb / 29P
[Old version datasheet]   LM22671/-Q1 42 V, 500 mA SIMPLE SWITCHER짰 Step-Down Voltage Regulator with Features
LM22672 TI-LM22672_15 Datasheet
1Mb / 30P
[Old version datasheet]   SIMPLE SWITCHER짰 Step-Down Voltage Regulator with Features
logo
National Semiconductor ...
LM22680 NSC-LM22680 Datasheet
568Kb / 16P
   2A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Features
logo
Texas Instruments
LM22680 TI-LM22680_15 Datasheet
1Mb / 27P
[Old version datasheet]   42 V, 2 A SIMPLE SWITCHER Step-Down Voltage Regulator With Features
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com