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SPX29300 Datasheet(PDF) 5 Page - Sipex Corporation

No. de Pieza. SPX29300
Descripción  3A High Current, Low Dropout Voltage Regulator
Descarga  11 Pages
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Fabricante  SIPEX [Sipex Corporation]
Página de inicio  http://www.sipex.com
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SPX29300 Datasheet(HTML) 5 Page - Sipex Corporation

 
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Date: 9/5/06 Rev C
SPX29300/01/02/03 3A Low Dropout Voltage Regulator
© 2006 Sipex Corporation
The SPX29300/01/02/03 incorporates pro-
tection against over-current faults, reversed
load insertion, over temperature operation, and
positive and negative transient voltage.
Thermal Considerations
Although the SPX29300/01/02/03 offers lim-
iting 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 = 10V, VOUT = 5V, IOUT =
1.5A, T
A = 50°C, θHA= 1°C/W, θCH= 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 = (VIN – VOUT) * IOUT = 7.5W.
And the junction temperature is calculated as
T
J = TA + PD * (θHA + θCH
+
θ
JC) or
T
J = 50 + 7.5 * (1+2+3) = 95°C
Reliable operation is insured.
Capacitor Requirements
The output capacitor is needed to insure sta-
bility and minimize the output noise. The value
of the capacitor varies with the load. However,
a minimum value of 10
μF 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
μF ceramic capacit-
or 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
SPX29300/01/02/03 is required.
Adjustable Regulator Design
The SPX29302/03 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(Vout/1.240-1).
Error Flag
The SPX29301/03 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 SPX29301/02 have an Enable function
that switches the regulator on and off. Their
thresholds are TTL compatible. When the
regulator is active, approximately 20 uA flows
through the Enable pin.
Typical Application Circuits
Figure 1 represents at typical fixed output
regulator. 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)].
A minimum value of 10kohms is recommen-
ded for R2 with a range between 10kohms and
47 kohms.
APPLICATION INFORMATION


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