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| 型号： | SPX29500T-3.3 |
| 元件分类： | 线性稳压 |
| 英文描述： | 5A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response Time |
| 中文描述： | 第5A低压差线性稳压器可调节 |
| 文件页数： | 7/11页 |
| 文件大小： | 515K |
| 代理商： | SPX29500T-3.3 |
5
Rev:A Date: 3/8/04
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
Copyright 2004 Sipex Corporation
APPLICATION INFORMATION
The SPX29500/01/02/03 incorporates protec-
tion against over-current faults, reversed load
insertion, over temperature operation, and posi-
tive and negative transient voltage.
Thermal Considerations
Although the SPX29500/01/02/03 offers limit-
ing 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
mounting is required.
TO-220 Design Example:
Assume that V
IN = 8V, VOUT = 5V, IOUT = 5A, TA
= 50
°C, θ
HA= 1°C/W, θCH= 2°C/W,
and
θ
JC=
2
°C/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 = (VIN – VOUT) * IOUT = 15W.
And the junction temperature is calculated as
T
J = TA + PD * (θHA + θCH
+
θ
JC) or
T
J = 50 + 15 * (1+2+2) = 125°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 22
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
F ce-
ramic capacitor between input & ground is rec-
ommended.
Minimum Load Current
To ensure a proper behavior of the regulator
under light load, a minimum load of 10mA for
SPX29500/01/02/03 is required.
Adjustable Regulator Design
The SPX29502/03 are adjustable regulators that
can be programmed to any value between 1.24V
and 16V using 2 resistors, R1 and R2. The
relationship between the resistors is:
R1 = R2(V
OUT/1.24-1).
Error Flag
The SPX29501/03 features an error flag that
indicates either an over current or under voltage
condition. The flag output goes low, sinking
10mA when either condition occurs.
Enable Input
The SPX29501/02 have an Enable function that
switches the regulator on and off. Their thresh-
olds are TTL compatible. Enabling the regulator
requires approximately 20
A of current.
Typical Application Circuits
Figure 1 represents at typical fixed output regu-
lator. Figure 2 represents an adjustable output
regulator. The values of R1 and R2 set the output
voltage value as follows:
V
OUT =VREF * [1 + (R1/R2)].
For best results, the total series resistance should
guarantee a minimum regulator load current of
10mA.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SPX29500T-5.0 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:5A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response Time |
| SPX29500T-L-1-8 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SPX29500T-L-2-5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SPX29500T-L-3-3 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SPX29500T-L-5-0 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
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