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參數(shù)資料
| 型號： | CS8321YDPR3 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | Micropower 5V, 150mA Low Dropout Linear Regulator |
| 中文描述： | 微5V的，150mA的低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大小： | 164K |
| 代理商： | CS8321YDPR3 |
C
Circuit Description and Application Notes: continued
4
The maximum power dissipation for a single output regu-
lator (Figure 3) is:
P
D(max)
=
(
V
IN(max)
DV
OUT(min)
)
I
OUT(max)
+V
IN(max)
I
Q
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 applica-
tion, and
I
Q
is the quiescent current the regulator consumes at
I
OUT(max)
.
(1)
Once the value of P
D(max)
is known, the maximum permis-
sible value of R
Q
JA
can be calculated:
R
Q
JA
=
(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 150C.
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 4: Single output regulator with key performance parameters
labeled.
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
Q
JA
:
R
Q
JA
= R
Q
JC
+ R
Q
CS
+ R
Q
SA
(3)
where:
R
Q
JC
= the junctionDtoDcase thermal resistance,
R
Q
CS
= the caseDtoDheatsink thermal resistance, and
R
Q
SA
= the heatsinkDtoDambient thermal resistance.
R
Q
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 inter-
face between them. These values appear in heatsink data
sheets of heatsink manufacturers.
Heatsinks
V
IN
CS8321
V
OUT
I
OUT
I
IN
I
Q
150C - T
A
P
D
Calculating Power Dissipation
in a Single Output Linear Regulator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS8321YDPR3G | 功能描述:低壓差穩(wěn)壓器 - LDO ANA 5V 150MA LOGEAR 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(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 |
| CS8321YT3 | 功能描述:低壓差穩(wěn)壓器 - LDO 5V/150mA 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(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 |
| CS8321YT3G | 功能描述:低壓差穩(wěn)壓器 - LDO 5V/150mA Micropower w/ENABLE 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(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 |
| CS832-2 | 制造商:Captive Fastener Corporation 功能描述: |
| CS832-3 | 制造商:Captive Fastener Corporation 功能描述: |
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