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參數(shù)資料
| 型號(hào)： | NCP5501DT50G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 500 mA Linear Regulator |
| 中文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PSSO2 |
| 封裝： | LEAD FREE, PLASTIC, DPAK-3 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大小： | 143K |
| 代理商： | NCP5501DT50G |
NCP5500, NCV5500, NCP5501, NCV5501
http://onsemi.com
6
DEFINITION OF TERMS
Dropout Voltage:
The input
to
output voltage differential
at which the circuit ceases to regulate against further
reduction input voltage. Measured when the output voltage
has dropped 2% relative to the value measured at 6.0 V
input, dropout voltage is dependent upon load current and
junction temperature.
Input Voltage:
The DC voltage applied to the input
terminals with respect to ground.
Line Regulation:
The change in output voltage for a change
in the input voltage. The measurement is made under
conditions of low dissipation or by using pulse techniques
such that the average chip temperature is not significantly
affected.
Load Regulation:
The change in output voltage for a change
in load current at constant chip temperature. Pulse loading
techniques are employed such that the average chip
temperature is not significantly affected.
Quiescent Current:
The part of the positive input current
that does not contribute to the positive load current. The
regulator ground pin current with no load.
Ripple Rejection:
The ratio of the peak
to
peak input ripple
voltage to the peak
to
peak output ripple voltage.
Current Limit:
Peak current that can be delivered to the
output.
Calculating Power Dissipation
The maximum power dissipation for a single output
regulator (Figure
3) is:
P
D(max)
V
IN(max)
V
OUT(min)
I
OUT(max)
V
IN(max)
I
q
(eq. 1)
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,
I
GND
is the ground current at I
OUT(max)
.
Once the value of P
D(max)
is known, the maximum
permissible value of R
JA
can be calculated:
150 C
T
A
P
D
The value of R
JA
can then be compared with those in the
package section of the data sheet. Those packages with R
JA
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.
R
JA
(eq. 2)
°
Heat sinks
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 R
JA
:
R
JA
R
JC
R
CS
R
SA
(eq. 3)
where
R
JC
is the junction
to
case thermal resistance,
R
CS
is the case
to
heatsink thermal resistance,
R
SA
is the heatsink
to
ambient 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, heat sink and the interface
between them. These values appear in data sheets of heat
sink manufacturers.
Thermal, mounting, and heat sink considerations are
further discussed in ON Semiconductor Application Note
AN1040/D.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP5501DT50G | 制造商:ON Semiconductor 功能描述:Linear Voltage Regulator IC |
| NCP5501DT50RKG | 功能描述:低壓差穩(wěn)壓器 - LDO ANA LDO REG 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 |
| NCP5501DT50RKG-CUT TAPE | 制造商:ON 功能描述:NCP5500 Series 5 V 500 mA Positive Fixed LDO Voltage Regulator - DPAK-3 |
| NCP5504 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:250 mA Dual Output Low Dropout Linear Regulator |
| NCP5504_06 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:250 mA Dual Output Low Dropout Linear Regulator |
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