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

X  

Preview PDF HTML

L6730B データシート(PDF) 28 Page - STMicroelectronics

部品番号 L6730B
部品情報  Adjustable step-down controller with synchronous rectification
PDF  52 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

L6730B データシート(HTML) 28 Page - STMicroelectronics

Back Button L6730B Datasheet HTML 24Page - STMicroelectronics L6730B Datasheet HTML 25Page - STMicroelectronics L6730B Datasheet HTML 26Page - STMicroelectronics L6730B Datasheet HTML 27Page - STMicroelectronics L6730B Datasheet HTML 28Page - STMicroelectronics L6730B Datasheet HTML 29Page - STMicroelectronics L6730B Datasheet HTML 30Page - STMicroelectronics L6730B Datasheet HTML 31Page - STMicroelectronics L6730B Datasheet HTML 32Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 28 / 52 page
background image
Device description
L6730 - L6730B
28/52
Doc ID 11938 Rev 3
Table 7 shows how to set the different options through an external resistor divider:
5.11
Synchronization
The presence of many converters on the same board can generate beating frequency noise.
To avoid this it is important to make them operate at the same switching frequency.
Moreover, a phase shift between different modules helps to minimize the RMS current on
the common input capacitors. Figure 24 shows the results of two modules in
synchronization. Two or more devices can be synchronized simply connecting together the
SYNCH pins. The device with the higher switching frequency will be the Master while the
other one will be the slave. The slave controller will increase its switching frequency
reducing the ramp amplitude proportionally and then the modulator gain will be increased.
To avoid a huge variation of the modulator gain, the best way to synchronize two or more
devices is to make them work at the same switching frequency and, in any case, the
switching frequencies can differ for a maximum of 50% of the lowest one. If, during
synchronization between two (or more) L6730, it’s important to know in advance which the
master is, it’s timely to set its switching frequency at least 15% higher than the slave. Using
an external clock signal (fEXT) to synchronize one or more devices that are working at a
different switching frequency (fSW) it is recommended to follow the below formula:
Figure 23.
External resistor
Table 7.
S/O/U and CC/O/U pin
R1
R2
VSOU/VCCDR
UVLO
OVP
SINK CC
N.C
0
Ω
0
5V BUS
Not latched
Not
11K
Ω
2.7K
Ω
0.2
5V BUS
Not latched
Yes
6.2K
Ω
2.7K
Ω
0.3
5V BUS
Latched
Not
4.3K
Ω
2.7K
Ω
0.4
5V BUS
Latched
Yes
2.7K
Ω
2.7K
Ω
0.5
12V BUS
Not latched
Not
1.8K
Ω
2.7K
Ω
0.6
12V BUS
Not latched
Yes
1.2K
Ω
2.7K
Ω
0.7
12V BUS
Latched
Not
0
Ω
N.C
1
12V BUS
Latched
Yes
R1
R2
L6730/B
S/O/U
CC/O/U
VCCDR
SW
EXT
SW
f
f
f
⋅
≤
≤
3
,
1



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 48 49 50 51 52


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