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參數(shù)資料
| 型號： | SPX29302A |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 3A High Current, Low Dropout Voltage Regulator Adjustable, Fast Response Time |
| 中文描述： | 第3A大電流，低壓差線性穩(wěn)壓器可調(diào)，快速響應(yīng)時間 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大小： | 57K |
| 代理商： | SPX29302A |
Date: 5/25/04
SPX29302A 3Amp LDO Low Dropout Voltage Regulator
Copyright 2004 Sipex Corporation
4
The SPX29302A incorporates protection
against over-current faults, reversed load
insertion, over temperature operation, and
positive and negative transient voltage.
Thermal Considerations
Although the SPX29302A offers limiting
circuitry for overload conditions, it is still
necessary to insure that the maximum junction
temperature is not exceeded in the applica-
tion. Heat will flow through the lowest
resistance path, the junction-to-case path. In
order to insure the best thermal flow of the
component, proper mounting is required.
TO-220 Design Example:
Assume that V
IN
= 10V, V
= 5V, I
OUT
=
1.5A, T
= 50
°
θ
= 1
°
C/W,
θ
CH
= 2
°
C/W,
and
θ
JC
= 3C
°
/W, where:
T
A
= ambient temperature,
θ
HA
= heatsink to ambient thermal
resistance
θ
CH
= case to heatsink thermal
resistance
θ
JC
= junction to case thermal
resistance
The power calculated under these conditions
is:
P
D
= (V
IN
– V
OUT
) * I
OUT
= 7.5W.
And the junction temperature is calculated as
T
J
= T
+ P
* (
θ
+
θ
+
θ
JC
) or
T
J
= 50 + 7.5 * (1+2+3) = 95
°
C
Reliable operation is insured below 125
°
C.
Capacitor Requirements
The output capacitor is needed to insure
stability and minimize the output noise. The
value of the capacitor varies with the load.
However, a minimum value of 10
μ
F alumi-
num capacitor will guarantee stability over all
load conditions. A tantalum capacitor is
recommended if a faster load transient
response is needed. If the power source has a
high AC impedance, a 0.1
μ
F ceramic capaci-
tor between input & ground is recommended.
Minimum Load Current
To ensure a proper behavior of the regulator
under light load, a minimum load of 5mA for
SPX29302A is required.
Adjustable Regulator Design
The SPX29302A are adjustable regulators that
can be programmed to any value between
1.25V and 16V using 2 resistors, R1 and R2.
The relationship between the resistors is:
R1 = R2(V
OUT
/1.240-1).
Enable Input
The SPX29302A has an Enable function that
switches the regulator on and off.
Its thresholds is TTL compatible. When the
regulator is active, approximately 20 uA flows
through the Enable pin.
Typical Application Circuits
Figure 1 represents an adjustable output linear
regulator. The values of R1 and R2 set the
output voltage value as follows:
V
=V
* [1 + (R1/R2)].
For best results, the total series resistance
should be small enough to pass a minimum
regulator load current of 5 mA. A minimum
value of 10kohms is recommended for R2
with a range between 10kohms and 47 kohms.
APPLICATION INFORMATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPX29302AT5 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:3A High Current, Low Dropout Voltage Regulator Adjustable, Fast Response Time |
| SPX29302AT5/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:3A High Current, Low Dropout Voltage Regulator Adjustable, Fast Response Time |
| SPX29302AT5-L | 功能描述:低壓差穩(wěn)壓器 - LDO 3A LOW DROPOUT 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 |
| SPX29302AT5-L/TR | 功能描述:低壓差穩(wěn)壓器 - LDO 3A LOW DROPOUT 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 |
| SPX29302AU5 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:3A High Current, Low Dropout Voltage Regulator Adjustable, Fast Response Time |
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