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參數(shù)資料
| 型號(hào)： | SPX3940T-1.8 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1A Low Dropout Voltage Regulator Fixed Output, Fast Response |
| 中文描述： | 1A低壓差線性穩(wěn)壓器固定輸出，快速響應(yīng) |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 213K |
| 代理商： | SPX3940T-1.8 |
6
Date: 5/25/04 SPX3940 1A Low Dropout Voltage Regulator
Copyright 2004 Sipex Corporation
APPLICATION INFORMATION
The SPX3940 incorporates protection against
over-current faults, reversed load insertion, over
temperature operation, and positive and nega-
tive transient voltage.
Thermal Considerations
Although the SPX3940 offers limiting circuitry
for overload conditions, it is still necessary to
insure that the maximum junction temperature
is not exceeded in the application. 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 mount-
ing is required. Consult heatsink manufacturer
for thermal resistance and design of heatsink.
For example, TO-220 design:
Assume that V
IN
= 10V, V
= 5V, I
OUT
= 1.5A,
T
A
= 50
°
C/W,
θ
HA
= 1
°
C/W,
θ
CH
= 2
°
θ
= 3
°
C/W.
Where TA = 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
) or
T
J
= 50 + 7.5 * (1 + 2 + 3) = 95
°
C
Reliable operation is insured.
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 aluminum 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 capacitor 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 SPX3940
is required.
SPX3940
V
OUT
V
IN
+
6.8
μ
F
+10
μ
F
1
2
3
Figure 18. Fixed Output Linear Regulator.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPX3940T-2.5 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1A Low Dropout Voltage Regulator Fixed Output, Fast Response |
| SPX3940T-2.5/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1A Low Dropout Voltage Regulator Fixed Output, Fast Response |
| SPX3940T-3.3 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1A Low Dropout Voltage Regulator Fixed Output, Fast Response |
| SPX3940T-3.3/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1A Low Dropout Voltage Regulator Fixed Output, Fast Response |
| SPX3940T-5.0 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1A Low Drop Out Voltage Regulator |
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