数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

SI-8050S 数据表(PDF) 5 Page - Sanken electric

部件名 SI-8050S
功能描述  Full-Mold, Separate Excitation Switching Type
Download  6 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  SANKEN [Sanken electric]
网页  http://www.sanken-ele.co.jp/en
标志 SANKEN - Sanken electric

SI-8050S 数据表(HTML) 5 Page - Sanken electric

  SI-8050S Datasheet HTML 1Page - Sanken electric SI-8050S Datasheet HTML 2Page - Sanken electric SI-8050S Datasheet HTML 3Page - Sanken electric SI-8050S Datasheet HTML 4Page - Sanken electric SI-8050S Datasheet HTML 5Page - Sanken electric SI-8050S Datasheet HTML 6Page - Sanken electric  
Zoom Inzoom in Zoom Outzoom out
 5 / 6 page
background image
84
Caution
1. Selecting External Components
(1) Choke coil L1
To maintain the stable operation of the regulator, choke coil L1
should be selected appropriately.
When selecting choke coil L1, consider the following:
a) Suitable for a switching regulator
Do not use a coil as a noise filter because it generates excess
heat.
b) Appropriate inductance
The greater the inductance of the choke coil, the smaller the
output ripple voltage. However, the size of the coil increases
large as the inductance increases. If the inductance is low, a
greater peak current flows to the IC and loss increases. This
is not favorable for stable operation.
The standard external circuit shows reference inductance val-
ues suitable for stable operation. However, the appropriate
inductance may also be calculated as follows:
L=
(VIN–VO)•VO
∆IL•VIN•f
Where, deltaIL indicates the ripple current of the choke coil
that is roughly set as follows:
• If the working output current is close to the maximum rating
(3 A) of SI-8000S
Ripple current = output current
× 0.2 to 0.3
• If the working output current is about 1.0A or less
Ripple current = output current
× 0.3 to 0.4
c) Satisfying the rated current
The rated current of a choke coil must be greater than the
maximum load current. Note that the inductance decreases
drastically and an excess current flows if the load current ex-
ceeds the rated current of the coil.
d) Good DC current superposition characteristics
The current flowing through a choke coil is a triangular wave-
form current superimposed on a DC current equal to the load
current. The coil inductance decreases as the load current
increases. In general, the coil can be used until the induc-
tance drops to 50% of the rated value. Use this as the refer-
ence value for selection.
100%
50%
IO (max.)
Inductance
Load current
e) Less noise
A drum-type open magnetic core coil can affect peripheral
circuits with noise because the flux passes outside the coil.
To avoid this problem, use a toroidal, EI, or EE type open
magnetic core coil.
qSI-8000S Series
(2) Input capacitor C1
Input capacitor C1 operates as a bypass capacitor in the input
circuit.
When selecting input capacitor C1, consider the following:
a) The breakdown voltage is higher than the maximum input volt-
age.
b) Satisfies the allowable ripple current
Exceeding the ratings of this capacitor or using it without de-
rating may reduce its service life and also cause the regulator
to malfunction. Therefore, an input capacitor with a sufficient
margin should be selected. With the SI-8000S Series, the
effective ripple current Irms flowing to the input capacitor can
be calculated approximately as follows:
Irms
1.2
×
VO
× IO
VIN
(3) Output capacitor C2
Output capacitor C2 operates as a smoothing capacitor for switch-
ing output. The output ripple voltage from the regulator is deter-
mined by the product of the pulsating current part
∆IL (=C2 charge-
discharge current) of the choke coil current and the equivalent
series resistance ESR of the output capacitor C2.
Vrip=
∆IL•C2ESR
Therefore, a capacitor of low equivalent series resistance ESR
should be selected to reduce the output ripple voltage. It is rec-
ommended to select a low-impedance capacitor intended for use
with switching regulators as C2.
(4) Diode D1
Use a Schottky barrier diode for D1. If you use a general rectifier
diode or fast recovery diode, the IC may be damaged. (Sanken
RK46 recommended)
2. Notes on Pattern Design
(1) Large current line
Since a large current flows through the bold lines in the standard
external circuit make the pattern as wide and as short as pos-
sible.
2
1
3
4
SI-8000S
VIN
GND
C1
C2
L1
D1
VOUT
GND
+
+
(2) Input capacitor
Place the input capacitor C1 and output capacitor C2 as close to
the IC as possible. Since a large current flows through the lead
wires of the input and output capacitors to charge and discharge
them quickly, minimize the lead wire length. The pattern around
the capacitors should also be minimized.
C1. C2.
C1. C2.
+
+
Example of bad pattern
Example of good pattern


类似零件编号 - SI-8050S

制造商部件名数据表功能描述
logo
Sanken electric
SI-8050S SANKEN-SI-8050S Datasheet
61Kb / 2P
   Full-Mold, Separate Excitation Step-down Switching Mode
SI-8050SD SANKEN-SI-8050SD Datasheet
455Kb / 5P
   Surface Mount Separate Excitation Step-down Switching Mode Regulator ICs
SI-8050SD SANKEN-SI-8050SD Datasheet
55Kb / 2P
   Surface Mount, Separate Excitation Step-down Switching Mode
More results

类似说明 - SI-8050S

制造商部件名数据表功能描述
logo
Sanken electric
SI-8000E SANKEN-SI-8000E Datasheet
41Kb / 4P
   Full-Mold, Separate Excitation Switching Type
SI-8000JF SANKEN-SI-8000JF Datasheet
87Kb / 6P
   Full-Mold, Separate Excitation Switching Type
SI-8015JF SANKEN-SI-8015JF Datasheet
83Kb / 2P
   Full-Mold, Separate Excitation Step-down Switching Mode
SI-8050JF SANKEN-SI-8050JF Datasheet
83Kb / 2P
   Full-Mold, Separate Excitation Step-down Switching Mode
SI-8090S SANKEN-SI-8090S Datasheet
61Kb / 2P
   Full-Mold, Separate Excitation Step-down Switching Mode
SI-8000JF SANKEN-SI-8000JF_11 Datasheet
83Kb / 2P
   Full-Mold, Separate Excitation Step-down Switching Mode
SI-8050S SANKEN-SI-8050S Datasheet
61Kb / 2P
   Full-Mold, Separate Excitation Step-down Switching Mode
SI-8120JF SANKEN-SI-8120JF Datasheet
83Kb / 2P
   Full-Mold, Separate Excitation Step-down Switching Mode
SI-8120S SANKEN-SI-8120S Datasheet
61Kb / 2P
   Full-Mold, Separate Excitation Step-down Switching Mode
SI-8050E SANKEN-SI-8050E Datasheet
49Kb / 2P
   Full-Mold, Separate Excitation Step-down Switching Mode
More results


Html Pages

1 2 3 4 5 6


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
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