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參數(shù)資料
| 型號(hào)： | NCV4275 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 5.0V, 450mA Low Drop Voltage Regulator(5.0V, 450mA低壓差穩(wěn)壓器) |
| 中文描述： | 5.0V，四百五十○毫安低壓差穩(wěn)壓器（5.0V，四百五十○毫安低壓差穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大?。?/td> | 117K |
| 代理商： | NCV4275 |
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NCV4275
http://onsemi.com
8
Calculating Power Dissipation
in a Single Output Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 14) is:
PD(max)
[VI(max)
VI(max)Iq
VQ(min)]IQ(max)
(1)
where
V
I(max)
V
Q(min)
I
Q(max)
is the maximum input voltage,
is the minimum output voltage,
is the maximum output current for the
application,
is the quiescent current the regulator
consumes at I
Q(max)
.
Once the value of P
D(max)
is known, the maximum
permissible value of R
JA
can be calculated:
150
°
C
I
q
RJA
TA
PD
(2)
The value of R
JA
can then be compared with those in the
package 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
heatsink will be required.
SMART
REGULATOR
Iq
Control
Features
I
Q
I
I
Figure 14. Single Output Regulator with Key
Performance Parameters Labeled
V
I
V
Q
}
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
:
RJA
RJC
RCS
RSA
(3)
where
R
JC
is the junctiontocase thermal resistance,
R
CS
is the casetoheatsink thermal resistance,
R
SA
is the heatsinktoambient thermal
resistance.
R
JC
appears in the package section of the data sheet.
Like R
JA
, it too 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 heatsink
data sheets of heatsink manufacturers.
Thermal, mounting, and heatsinking considerations are
discussed in the ON Semiconductor application note
AN1040/D.
相關(guān)PDF資料 |
PDF描述 |
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| NCV4279B | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BDW | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BDWR2 | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BD1 | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BD1R2 | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV4275/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5V Low-Drop Voltage Regulator |
| NCV4275A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:5.0 V, 3.3 V 450 mA Low-Dropout Voltage Regulator with Reset |
| NCV4275ADS33G | 功能描述:低壓差穩(wěn)壓器 - LDO 450mA LDO 3.3V 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4275ADS33R4G | 功能描述:低壓差穩(wěn)壓器 - LDO 450mA LDO 3.3V 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4275ADS50G | 功能描述:低壓差穩(wěn)壓器 - LDO 450 mA LDO 5V 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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