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

X  

Preview PDF HTML

A6984 データシート(PDF) 25 Page - STMicroelectronics

部品番号 A6984
部品情報  36 V, 400 mA automotive synchronous step-down switching regulator
PDF  47 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6984 データシート(HTML) 25 Page - STMicroelectronics

Back Button A6984 Datasheet HTML 21Page - STMicroelectronics A6984 Datasheet HTML 22Page - STMicroelectronics A6984 Datasheet HTML 23Page - STMicroelectronics A6984 Datasheet HTML 24Page - STMicroelectronics A6984 Datasheet HTML 25Page - STMicroelectronics A6984 Datasheet HTML 26Page - STMicroelectronics A6984 Datasheet HTML 27Page - STMicroelectronics A6984 Datasheet HTML 28Page - STMicroelectronics A6984 Datasheet HTML 29Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 25 / 47 page
background image
DocID030396 Rev 1
25/47
A6984
Device description
47
In the CCM operation, the average value for the triangular signal in Equation 15 is:
Equation 16
so the output voltage is calculated as:
Equation 17
that shows the average injected ripple entered in the divider calculation.
In addition, since the virtual FB ripple depends on the input voltage (the switching frequency
is almost constant, see Section 4.2 on page 16) its contribution affects the average output
voltage regulation.
In the low noise mode (for LNM operation refer to Section 4.6.2 on page 31) the regulator
operates in the forced PWM over the load range so:
Equation 18
and the accuracy can be estimated as:
Equation 19
In the low consumption mode (for LCM operation refer to Section 4.6.1 on page 31) the
regulator skips pulses at light load to increase the efficiency.
VFB
AVG VIN

1
2
---
V
IN
V
OUT
–
R
COT
C
COT
----------------------------------
V
OUT
V
IN
--------------
1
fsw
---------

=
V
OUT
0.9
VFB
AVG VIN

+
 1
R
3
R
2
-------
+


=
V
OUTMIN
0.9
VFB
AVG VINMIN

+
 1
R
3
R
2
-------
+


=
V
OUTMAX
0.9
VFB
AVG VINMAX

+
 1
R
3
R
2
-------
+


=
V
OUT
LNM
–
1
2
---
V
OUT
fsw R
COT
C
COT

------------------------------------------------


V
INMAX
V
OUT
–
V
INMAX
---------------------------------------
V
INMIN
V
OUT
–
V
INMIN
-------------------------------------
–


1
R
3
R
2
-------
+



=



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 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47


データシート ダウンロード

Go To PDF Page


リンク URL



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   |   データシートへのリンク    |   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