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

X  

CS8391 数据表(PDF) 4 Page - Cherry Semiconductor Corporation

部件名 CS8391
功能描述  5V/250mA, 5V/100mA Micropower Low Dropout Regulator with ENABLE
Download  6 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  CHERRY [Cherry Semiconductor Corporation]
网页  http://www.cherrycorp.com/
标志 CHERRY - Cherry Semiconductor Corporation

CS8391 数据表(HTML) 4 Page - Cherry Semiconductor Corporation

  CS8391 Datasheet HTML 1Page - Cherry Semiconductor Corporation CS8391 Datasheet HTML 2Page - Cherry Semiconductor Corporation CS8391 Datasheet HTML 3Page - Cherry Semiconductor Corporation CS8391 Datasheet HTML 4Page - Cherry Semiconductor Corporation CS8391 Datasheet HTML 5Page - Cherry Semiconductor Corporation CS8391 Datasheet HTML 6Page - Cherry Semiconductor Corporation  
Zoom Inzoom in Zoom Outzoom out
 4 / 6 page
background image
The CS8391 is a micropower dual 5V regulator. All bias
required to operate the internal circuitry is derived from
the standby output, VOUT2. If this output experiences an
over current situation and collapses, then VOUT1 will also
collapse (see timing diagrams).
If there is critical circuitry that must remain active under
most conditions it should be connected to VOUT2. Any cir-
cuitry that is likely to be subjected to a short circuit, e.g.,
circuitry outside the module, should be connected to VOUT1.
Output capacitors are required for stability with the CS8391.
Without them, the regulator outputs will oscillate. Actual
size and type may vary depending upon the application
load and temperature range. Capacitor effective series
resistance (ESR) is also a factor in the IC stability. Worst-
case is determined at the minimum ambient temperature
and maximum load expected.
Output capacitors can be increased in size to any desired
value above the minimum. One possible purpose of this
would be to maintain the output voltages during brief con-
ditions of negative input transients that might be character-
istic of a particular system.
Capacitors must also be rated at all ambient temperatures
expected in the system. To maintain regulator stability
down to -40ûC, capacitors rated at that temperature must be
used.
More information on capacitor selection for Smart
Regulatorsª is available in the Smart Regulator applica-
tion note, Compensation for Linear Regulators.
The ENABLE function controls VOUT1. When ENABLE is
high, VOUT1 is on. When ENABLE is low, VOUT1 is off.
The maximum power dissipation for a dual output regula-
tor (Figure 1) is:
PD(max) = {VIN(max)ÐVOUT1(min)}IOUT1(max)+
{VIN(max)ÐVOUT2(min)}IOUT2(max)+VIN(max)IQ (1)
where:
VIN(max) is the maximum input voltage,
VOUT1(min) is the minimum output voltage from VOUT1,
VOUT2(min) is the minimum output voltage from VOUT2,
IOUT1(max) is the maximum output current for the appli-
cation,
IOUT2(max) is the maximum output current for the appli-
cation, and
IQ is the quiescent current the regulator consumes at both
IOUT1(max) and IOUT2(max).
Once the value of PD(max) is known, the maximum per-
missible value of RQJA can be calculated:
RQJA =
(2)
The value of RQJA can then be compared with those in
the package section of the data sheet. Those packages with
RQJA's less than the calculated value in equation 2 will keep
the die temperature below 150¡C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external heat
sink will be required.
Figure 1: Dual output regulator with key performance parameters
labeled.
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed to
determine the value of RQJA:
RQJA = RQJC + RQCS + RQSA
(3)
where:
RQJC = the junctionÐtoÐcase thermal resistance,
RQCS = the caseÐtoÐheat sink thermal resistance, and
RQSA = the heat sinkÐtoÐambient thermal resistance.
RQJC appears in the package section of the data sheet. Like
RQJA, it too is a function of package type. RQCS and RQSA are
functions of the package type, heat sink and the interface
between them. These values appear in heat sink data sheets
of heat sink manufacturers.
Heat Sinks
VIN
VOUT2
IIN
IQ
Control
Features
}
IOUT2
VOUT1
IOUT1
Smart
Regulator
150¡C - TA
PD
Calculating Power Dissipation
in a Dual Output Linear Regulator
ENABLE
External Capacitors
General
4
Application Notes


类似零件编号 - CS8391

制造商部件名数据表功能描述
logo
Shenzhenshi YONGFUKANG ...
CS8390E YONGFUKANG-CS8390E Datasheet
3Mb / 10P
   BOOST
More results

类似说明 - CS8391

制造商部件名数据表功能描述
logo
Cherry Semiconductor Co...
CS8281 CHERRY-CS8281 Datasheet
153Kb / 6P
   5V/250mA, 5V/100mA Micropower Low Dropout Regulator with ENABLE
CS8101 CHERRY-CS8101 Datasheet
196Kb / 8P
   Micropower 5V, 100mA Low Dropout Linear Regulator with RESET and ENABLE
CS8221 CHERRY-CS8221 Datasheet
149Kb / 6P
   Micropower 5V, 100mA Low Dropout Linear Regulator
CS8135 CHERRY-CS8135 Datasheet
180Kb / 8P
   5V, 5V Low Dropout Dual Regulator with /ENABLE RESET
CS8361 CHERRY-CS8361 Datasheet
169Kb / 6P
   5V Dual Micropower Low Dropout Regulator with ENABLE and RESET
logo
Global Mixed-mode Techn...
G9105 GMT-G9105 Datasheet
404Kb / 9P
   5V 1A Low Dropout Regulator with Enable
logo
Cherry Semiconductor Co...
CS8161 CHERRY-CS8161 Datasheet
198Kb / 8P
   12V, 5V Low Dropout Dual Regulator with ENABLE
CS8147 CHERRY-CS8147 Datasheet
173Kb / 8P
   10V/5V Low Dropout Dual Regulator with ENABLE
CS8156 CHERRY-CS8156 Datasheet
172Kb / 8P
   12V, 5V Low Dropout Dual Regulator with ENABLE
CS8164 CHERRY-CS8164 Datasheet
167Kb / 8P
   8V/5V Low Dropout Dual Regulator with ENABLE
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