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LM7915CT bảng dữ liệu(PDF) 4 Page - National Semiconductor (TI)

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tên linh kiện LM7915CT
Giải thích chi tiết về linh kiện  LM79XX Series 3-Terminal Negative Regulators
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Design Considerations
The LM79XX fixed voltage regulator series has thermal
overload protection from excessive power dissipation inter-
nal short circuit protection which limits the circuit’s maxi-
mum 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 junc-
tion temperature must be kept below the maximum speci-
fied temperature (125 C) in order to meet data sheet specifi-
cations To calculate the maximum junction temperature or
heat sink required the following thermal resistance values
should be used
Typ
Max
Typ
Max
Package
iJC
iJC
iJA
iJA
CW
CW
CW
CW
TO-220
30
50
60
40
PD MAX e
TJ Max b TA
iJC a iCA
or
TJ Max TA
iJA
iCA e iCS a iSA (without heat sink)
Solving for TJ
TJ e TA a PD (iJC a iCA)or
e
TA a PDiJA (without heat sink)
Where
TJ
e
Junction Temperature
TA
e
Ambient Temperature
PD
e
Power Dissipation
iJA e Junction-to-Ambient Thermal Resistance
iJC e Junction-to-Case Thermal Resistance
iCA e Case-to-Ambient Thermal Resistance
iCS e Case-to-Heat Sink Thermal Resistance
iSA e Heat Sink-to-Ambient Thermal Resistance
Typical Applications (Continued)
Bypass capacitors are necessary for stable operation of the
LM79XX series of regulators over the input voltage and out-
put current ranges Output bypass capacitors will improve
the transient response by the regulator
The bypass capacitors (22 mF on the input 10 mFonthe
output) should be ceramic or solid tantalum which have
good high frequency characteristics If aluminum electrolyt-
ics are used their values should be 10 mF or larger The
bypass capacitors should be mounted with the shortest
leads and if possible directly across the regulator termi-
nals
High Stability 1 Amp Regulator
TLH7340 – 5
Load and line regulation k 001% temperature stability s 02%
Determine Zener current
Solid tantalum
Select resistors to set output voltage 2 ppm C tracking suggested
4


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