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參數(shù)資料
| 型號： | CS8182YDP5 |
| 英文描述： | Positive Adjustable Voltage Regulator |
| 中文描述： | 積極可調(diào)電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 64K |
| 代理商： | CS8182YDP5 |
4
Application Notes
C
The output capacitor for the CS8182 is required for stabili-
ty. 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. Worst-
case 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 tempera-
tures expected in the system. To maintain regulator stabili-
ty down to -40°C, a capacitor rated at that temperature
must be used.
More information on capacitor selection for Smart
Regulators is available in the Smart Regulator applica-
tion note, “Compensation for Linear Regulators.”
The maximum power dissipation for a single output regu-
lator (Figure 1) is:
P
D(max)
= {V
IN(max)
- V
OUT(min)
}I
OUT(max)
+ V
IN(max)
I
Q
(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 applica-
tion, and
I
Q
is the quiescent current the regulator consumes at
I
OUT(max)
.
Once the value of P
D(max)
is known, the maximum permis-
sible value of R
Θ
JA
can be calculated:
R
Θ
JA
=
(2)
The value of R
Θ
JA
can then be compared with those in
the package section of the data sheet. Those packages
with R
Θ
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 1. 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
Θ
JA
.
R
Θ
JA
= R
Θ
JC
+ R
Θ
CS
+ R
Θ
SA
where:
R
Θ
JC
= the junction–to–case thermal resistance,
R
Θ
CS
= the case–to–heatsink thermal resistance, and
R
Θ
SA
= the heatsink–to–ambient thermal resistance.
R
Θ
JC
appears in the package section of the data sheet. Like
R
Θ
JA
, it is a function of package type. R
Θ
CS
and R
Θ
SA
are
functions of the package type, heatsink and the interface
between them. These values appear in heat sink data
sheets of heatsink manufacturers.
(3)
Heatsinks
V
IN
Smart
Regulator
V
OUT
I
OUT
I
IN
I
Q
Control
Features
}
150°C - T
A
P
D
Calculating Power Dissipation
in a Single Output Linear Regulator
External Capacitors
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| CS8182YDPR5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Adjustable Voltage Regulator |
| CS8182YDPS5 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.8-45V ADJ 200mA 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 |
| CS8182YDPS5G | 功能描述:低壓差穩(wěn)壓器 - LDO 200mA TRCKNG/LN DRV 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 |
| CS8182YDPSR5 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.8-45V ADJ 200mA 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 |
| CS8182YDPSR5G | 功能描述:低壓差穩(wěn)壓器 - LDO 200mA TRCKNG/LN DRV 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 |
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