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參數(shù)資料
| 型號(hào)： | NCV8508 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 5.0 V, 250 mA LDO with Watchdog and RESET |
| 中文描述： | 5.0V的，250 mA的LDO，帶有看門狗和RESET |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 89K |
| 代理商： | NCV8508 |
NCV8508
http://onsemi.com
10
APPLICATION NOTES
Calculating Power Dissipation in a Single Output
Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 19) is:
PD(max)
[VIN(max)
VIN(max)IQ
VOUT(min)]IOUT(max)
(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, and
I
Q
is the quiescent current the regulator consumes at
I
OUT(max)
.
SMART
REGULATOR
I
Q
Control
Features
I
OUT
I
IN
Figure 19. Single Output Regulator with Key
Performance Parameters Labeled
V
IN
V
OUT
}
Once the value of P
D(max)
is known, the maximum
permissible value of R
JA
can be calculated:
150
°
C
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.
Figure 20. 16 Lead SOW (4 Leads Fused), JA as
a Function of the Pad Copper Area (2 oz. Cu
Thickness), Board Material = 0.0625 G10/R4
40
70
90
100
T
J
J
,
°
C
0
Copper Area (inch
2
)
0.5
1.0
1.5
2.0
3.0
80
60
50
2.5
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
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 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.
RSA
(3)
ORDERING INFORMATION
Device
Output Voltage
Package
Shipping
NCV8508DW50
5.0 V
SO16L
47 Units / Rail
NCV8508DW50G
5.0 V
SO16L
(PbFree)
47 Units / Rail
NCV8508DW50R2
5.0 V
SO16L
1000 / Tape & Reel
NCV8508D2T50
5.0 V
D
2
PAK7
50 Units / Rail
NCV8508D2T50G
5.0 V
D
2
PAK7
(PbFree)
50 Units / Rail
NCV8508D2T50R4
5.0 V
D
2
PAK7
750 / Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCV8508D2T50 | 5.0 V, 250 mA LDO with Watchdog and RESET |
| NCV8508D2T50G | 5.0 V, 250 mA LDO with Watchdog and RESET |
| NCV8508D2T50R4 | 5.0 V, 250 mA LDO with Watchdog and RESET |
| NCV8508DW50 | 5.0 V, 250 mA LDO with Watchdog and RESET |
| NCV8508DW50G | 5.0 V, 250 mA LDO with Watchdog and RESET |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV85081BDS50G | 功能描述:低壓差穩(wěn)壓器 - LDO 250 MA, 5 V, LDO 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 |
| NCV85081BDS50R4G | 功能描述:低壓差穩(wěn)壓器 - LDO 250 MA 5 V LDO 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 |
| NCV85081BDS50R4G/H | 制造商:ON Semiconductor 功能描述: |
| NCV85081BPD50R2G | 功能描述:低壓差穩(wěn)壓器 - LDO 250 MA 5 V LDO 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 |
| NCV85081BPD50R2G/H | 制造商:ON Semiconductor 功能描述: |
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