EL5106ISZ(2007) データシートの表示（PDF） - Intersil
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EL5106ISZ Datasheet PDF : 12 Pages
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EL5106, EL5306
Current Limiting
The EL5106 and EL5306 have no internal current-limiting
circuitry. If the output is shorted, it is possible to exceed the
Absolute Maximum Rating for output current or power
dissipation, potentially resulting in the destruction of the
device.
Power Dissipation
With the high output drive capability of the EL5106 and
EL5306, it is possible to exceed the +125°C Absolute
Maximum junction temperature under certain very high load
current conditions. Generally speaking when RL falls below
about 25Ω, it is important to calculate the maximum junction
temperature (TJMAX) for the application to determine if
power supply voltages, load conditions, or package type
need to be modified for the EL5106 and EL5306 to remain in
the safe operating area. These parameters are calculated as
follows:
TJMAX = TMAX + (θJA × n × PDMAX)
where:
TMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
n = Number of amplifiers in the package
PDMAX = Maximum power dissipation of each amplifier in
the package
PDMAX for each amplifier can be calculated as follows:
PDMAX =
(2 × VS × ISMAX ) +
( VS
-
VOUTMAX )
×
V-----O----U----T----M-----A----X--
RL
where:
VS = Supply voltage
ISMAX = Maximum bias supply current
VOUTMAX = Maximum output voltage (required)
RL = Load resistance
9
FN7357.5
May 3, 2007
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