EL5246CSZ Просмотр технического описания (PDF) - Intersil
Номер в каталоге
Компоненты Описание
производитель
EL5246CSZ Datasheet PDF : 19 Pages
| |||
EL5144, EL5146, EL5244, EL5246, EL5444
relative to the GND pin. Letting the CE pin float will enable
the amplifier. Hence, the 8-pin PDIP and SOIC single amps
are pin compatible with standard amplifiers that don’t have a
power down feature.
Short Circuit Current Limit
The EL5144 series amplifiers do not have internal short
circuit protection circuitry. Short circuit current of 90mA
sourcing and 65mA sinking typically will flow if the output is
trying to drive high or low but is shorted to half way between
the rails. If an output is shorted indefinitely, the power
dissipation could easily increase such that the part will be
destroyed. Maximum reliability is maintained if the output
current never exceeds ±50mA. This limit is set by internal
metal interconnect limitations. Obviously, short circuit
conditions must not remain or the internal metal connections
will be destroyed.
Power Dissipation
With the high output drive capability of the EL5144 series
amplifiers, it is possible to exceed the 150°C Absolute
Maximum junction temperature under certain load current
conditions. Therefore, it is important to calculate the
maximum junction temperature for the application to
determine if load conditions or package type need to be
modified for the amplifier to remain in the safe operating
area.
The maximum power dissipation allowed in a package is
determined according to:
PDMAX = T----J---M-----A----X--θ----J----A-T----A----M----A----X--
where:
TJMAX = Maximum junction temperature
TAMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
PDMAX = Maximum power dissipation in the package
The maximum power dissipation actually produced by an IC
is the total quiescent supply current times the total power
supply voltage, plus the power in the IC due to the load, or:
PDMAX =
N×
VS
×
ISMAX
+
( VS
-
VOUT )
×
V-----O----U----T--
RL
If we set the two PDMAX equations equal to each other, we
can solve for RL:
RL
=
-------------------V----O-----U----T-----×----(---V----S-----------V----O----U-----T---)-------------------
-T---J---M-----A-N---X---×------θ--T-J---AA----M----A----X--
-
(VS × ISMAX)
Assuming worst case conditions of TA = +85°C,
VOUT = VS/2V, VS = 5.5V, and ISMAX = 8.8mA per amplifier,
below is a table of all packages and the minimum RL
allowed.
PART
EL5144CW
EL5146CS
EL5146CN
EL5244CS
EL5244CN
EL5244CY
EL5246CY
EL5246CS
EL5246CN
EL5444CU
EL5444CS
EL5444CN
PACKAGE
SOT23-5
SOIC-8
PDIP-8
SOIC-8
PDIP-8
MSOP-8
MSOP-10
SOIC-14
PDIP-14
QSOP-16
SOIC-14
PDIP-14
MINIMUM RL
37
21
14
48
30
69
69
34
23
139
85
51
EL5144 Series Comparator Application
The EL5144 series amplifier can be used as a very fast,
single supply comparator. Most op amps used as a
comparator allow only slow speed operation because of
output saturation issues. The EL5144 series amplifier
doesn’t suffer from output saturation issues. Figure 3 shows
the amplifier implemented as a comparator. Figure 4 is a
where:
N = Number of amplifiers in the package
VS = Total supply voltage
ISMAX = Maximum supply current per amplifier
VOUT = Maximum output voltage of the application
RL = Load resistance tied to ground
17
Share Link: 