SPX29150T-1.8 查看數據表（PDF） - Signal Processing Technologies

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SPX29150T-1.8

1.5A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response Time

Signal Processing Technologies 

The SPX29150/51/52/53 incorporates protec-

tion against over-current faults, reversed load

insertion, over temperature operation, and

positive and negative transient voltage.

Thermal Considerations

Although the SPX29150/51/52/53 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 mounting is required.

Consult the heatsink manufacturer for thermal

resistance and heat sink design.

TO-220 Design Example:

Assume that VIN = 10V, VOUT = 5V, IOUT =

1.5A, TA = 50°C, θHA= 1°C/W, θCH= 2°C/W,

and θJC= 3C°/W, where:

TA = ambient temperature,

θHA= heatsink to ambient thermal

resistance

θCH= case to heatsink thermal

resistance

θJC = junction to case thermal

resistance

The power calculated under these conditions

is:

PD = (VIN – VOUT) * IOUT = 7.5W.

APPLICATION INFORMATION

And the junction temperature is calculated as

TJ = TA + PD * (θHA + θCH + θJC) or

TJ = 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 10µF 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 0.1µF 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

SPX29150/51/52/53 is required.

Typical Application Circuits

Figure 19 represents at typical fixed output

regulator. Figure 20 represents an adjustable

output regulator. The values of R1 and R2 set

the output voltage value as follows: VOUT

=VREF * [1 + (R1/R2)]. For best results, the

total series resistance should be small enough

to pass a minimum regulator load current of

5mA. A minimum value of 10kΩ is recom-

mended for R2 with a range between 10kΩ

and 47kΩ.

VIN

+

6.8 F

1 SPX29150 3

2

VOUT

+ 10 F

VIN

+

6.8 F

1 SPX29152 4

2

3

GND

5

ADJ

VOUT

+

R1

10 F

R2

Figure 19. Fixed Output Linear Regulator

Figure 20. Adjustable Output Linear Regulator

Date:5/25/04

SP29150/51/52/53 1.5A Low Dropout Voltage Regulator

7

© Copyright 2004 Sipex Corporation

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