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參數(shù)資料
| 型號： | NCV8184 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Micropower 70 mA Low Dropout Tracking Regulator/Line Driver |
| 中文描述： | 微七十毫安低壓差跟蹤穩(wěn)壓器/線驅(qū)動器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 143K |
| 代理商： | NCV8184 |
NCV8184
http://onsemi.com
8
External Capacitors
The output capacitor for the NCV8184 is required for
stability. Without it, the regulator output 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.
Worstcase is determined at the minimum ambient
temperature and maximum load expected.
The output capacitor can be increased in size to any
desired value above the minimum. One possible purpose of
this would be to maintain the output voltage during brief
conditions of negative input transients that might be
characteristic of a particular system.
The capacitor must also be rated at all ambient
temperatures expected in the system. To maintain regulator
stability down to 40
°
C, a capacitor rated at that temperature
must be used.
More information on capacitor selection for SMART
REGULATOR
s is available in the SMART REGULATOR
application note, “Compensation for Linear Regulators,”
document number SR003AN/D, available through our
website at http://www.onsemi.com.
Calculating Power Dissipation in a Single Output
Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 23) is:
{VIN(max)
VIN(max)IQ
where:
V
IN(max)
is the maximum input voltage,
V
OUT(min)
is the minimum output voltage,
I
OUT(max)
is the maximum output current, for the
application,and
I
Q
is the quiescent current the regulator consumes at
I
OUT(max)
.
Once the value of PD(max) is known, the maximum
permissible value of R
JA
can be calculated:
150
°
C
PD(max)
VOUT(min)} IOUT(max)
(eq. 1)
RJA
TA
PD
(eq. 2)
The value of R
JA
can then be compared with those in the
Package Thermal Data Section of the data sheet. Those
packages with R
JA
’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 23. Single Output Regulator with Key
Performance Parameters Labeled
Heatsinks
A heatsink 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 R
JA:
I
IN
I
OUT
I
Q
SMART
REGULATOR
V
OUT
V
IN
Control
Features
RJA
RJC
RCS
RSA
(eq. 3)
where:
R
JC
= the junctiontocase thermal resistance,
R
CS
= the casetoheatsink thermal resistance, and
R
SA
= the heatsinktoambient thermal resistance.
R
JC
appears in the package section of the data sheet. Like
R
JA
, it is a function of package type. R
CS
and R
SA
are
functions of the package type, heatsink and the interface
between them. These values appear in heat sink data sheets
of heatsink manufacturers.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCV8184D | Micropower 70 mA Low Dropout Tracking Regulator/Line Driver |
| NCV8184DR2 | Micropower 70 mA Low Dropout Tracking Regulator/Line Driver |
| NCV8503PWADJG | Micropower 400 mA LDO Linear Regulators with ENABLE, DELAY, Adjustable RESET, and General Use Comparator |
| NCV8503PWADJR2G | Micropower 400 mA LDO Linear Regulators with ENABLE, DELAY, Adjustable RESET, and General Use Comparator |
| NCV8503 | Micropower 400mA LDO Linear Regulators with ENABLE, DELAY, Adjustable RESET, and General Use Comparator(微功耗400mA，帶使能、延時、可調(diào)復位端與通用比較器的低壓差線性穩(wěn)壓器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV8184/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Micropower 70mA Low Dropout Tracking Regulator / Line Driver |
| NCV8184_06 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Micropower 70 mA Low Dropout Tracking Regulator/Line Driver |
| NCV8184D | 功能描述:低壓差穩(wěn)壓器 - LDO 70mA Tracking RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV8184DG | 功能描述:低壓差穩(wěn)壓器 - LDO 70mA Tracking RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV8184DR2 | 功能描述:低壓差穩(wěn)壓器 - LDO 70mA Tracking RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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