EL5164IW-T7 View Datasheet(PDF) - Intersil
Part Name
Description
MFG CO.
EL5164IW-T7 Datasheet PDF : 12 Pages
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EL5164, EL5165, EL5364
choice for driving isolation transformers in
telecommunications applications.
Driving Cables and Capacitive Loads
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, the back-termination series resistor will
decouple the EL5164, EL5165, and EL5364 from the cable
and allow extensive capacitive drive. However, other
applications may have high capacitive loads without a back-
termination resistor. In these applications, a small series
resistor (usually between 5Ω and 50Ω) can be placed in
series with the output to eliminate most peaking. The gain
resistor (RG) can then be chosen to make up for any gain
loss which may be created by this additional resistor at the
output. In many cases it is also possible to simply increase
the value of the feedback resistor (RF) to reduce the
peaking.
Current Limiting
The EL5164, EL5165, and EL5364 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 EL5164, EL5165,
and EL5364, 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 EL5164, EL5165, and EL5364 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 supply current of 1A
• VOUTMAX = Maximum output voltage (required)
• RL = Load resistance
Typical Application Circuits
0.1µF
+5V
IN+
IN-
-5V
VS+
OUT
VS-
0.1µF
375Ω
5Ω
0.1µF
+5V
IN+
IN-
-5V
VS+
OUT
VS-
0.1µF
375Ω
VIN
375Ω
VOUT
5Ω
FIGURE 23. INVERTING 200mA OUTPUT CURRENT
DISTRIBUTION AMPLIFIER
375Ω
375Ω
+5V
IN+
IN-
375Ω -5V
0.1µF
VS+
OUT
VS-
0.1µF
375Ω +5V
VIN
IN+
IN-
-5V
0.1µF
VS+
OUT
VS-
0.1µF
VOUT
FIGURE 24. FAST-SETTLING PRECISION AMPLIFIER
11
FN7389.5
August 10, 2005
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