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excellent 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 EL5293 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 5

Ω and

50

Ω) can be placed in series with the output to eliminate

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

Current Limiting

The EL5293 has 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 EL5293, it is

possible to exceed the 125°C Absolute Maximum junction

temperature under certain very high load current conditions.

important to calculate the maximum junction temperature

voltages, load conditions, or package type need to be

modified for the EL5293 to remain in the safe operating area.

These parameters are calculated as follows:

where:

n = Number of amplifiers in the package

the package

where:

T

JMAX

T

MAX

θ

JA

nPD

MAX

×

×

()

+

=

PD

MAX

2

(

V

S

I

V

S

(

- V

V

OUTMAX

R

L

----------------------------

×

+

×

×

=

EL5293, EL5293A