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KIA79M08PI Folha de dados(PDF) 9 Page - KEC(Korea Electronics)

Nome de Peças KIA79M08PI
Descrição Electrónicos  BIPOLAR LINEAR INTEGRATED CIRCUIT (THREE TERMINAL POSITIVE VOLTAGE REGULATORS)
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Fabricante Electrônico  KEC [KEC(Korea Electronics)]
Página de início  http://www.keccorp.com
Logo KEC - KEC(Korea Electronics)

KIA79M08PI Folha de dados(HTML) 9 Page - KEC(Korea Electronics)

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2002. 9. 24
9/9
KIA79M05F/PI/T~79M15F/PI/T
Revision No : 2
Design Considerations
The KIA79M
×× fixed voltage regulator series have thermal
overload protection from excessive power, internal short circuit
protection which limits the circuit’s maximum current, and output
transistor safe-area compensation for reducing the output current
as the voltage across the pass transistor is increased.
Although the internal power dissipation is limited, the junction
temperature must be kept below the maximum specified temperature
in order to meet data sheet specifications. To calculate the maximum
junction temperature or heat sink required, the following thermal
resistance values should be used ;
Tjmax - Ta
PDMAX =
or
θ
JC
CA
Tjmax - Ta
=
θ
JA
θ
CA
CS
SA
Solving for TJ :
TJ = Ta+PD
JC
CA) or
= Ta+PD θ
JA
Where
TJ = Junction Temperature
Ta = Ambient Temperature
PD = Power Dissipation
θ
JC = Junction to Case Thermal Resistance
θ
CA = Case to Ambient Thermal Resistance
θ
CS = Case to Heaksink Thermal Resistance
θ
SA = Heatsink to Ambient Thermal Resistance
θ
JA = Junction to Ambient Thermal Resistance
Typical Applications
Bypass capacitors are necessary for stable operation of the
KIA79M
×× series of regulators over the input voltage and output
current ranges. Output bypass capacitors will improve the transient
response of the regulator.
The bypass capacitors (2.2
μF on the input, 1.0μF on the output),
Should be ceramic or solid tantalum which have good high frequency
characteristics. If aluminum electrolytics are used, their values
should be 10
μF or larger. The bypass capacitors should be mounted
with the shortest leads, and if possible, directly across the regulator
terminals.
(1) Required if regulator is separated from filter capacitor by
more than 3. For value given, capacitor must be solid tantalum.
25
μF aluminum electrolytic may be substituted.
(2) Required for stability. For value given, capacitor must be solid
tantalum. 25
μF aluminum electrolytic may be substituted.
Values given may be increased without limit.
For output capacitance in excess of 100
μF, a high current
diode from input to output (1N4001, etc.) will protect the
regulator from momentary input shorts.
* Improves transient response and ripple rejection.
Do not increase beyond 50
≦F.
R1+R2
VOUT=VSET (
)
R2
Select R2 as follows : KIA79M05
300
KIA79M08
470
KIA79M12
750
KIA79M15
1k
PACKAGE
θ
JC (℃/W)
θ
JA (℃/W)
DPAK
10.4
96.1
KIA79XX
+
+
GND
IN
OUT
-VO
-VI
1
µF
CO =
2.2
µF
CI =
2.2
µF
-
+
1
C
-
+
KIA79MXX
-
+
SOLID
TANTALUM
C
25
µF
3
1
R
R2
TANTALUM
C
1
µF
SOLID
2
25
µF
C 3
Varlable Output
*
INPUT
OUTPUT


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