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FN6293.5

July 27, 2009

the gain error contributed by the resistors. There is an

additional gain error due to the tolerance of the resistors used.

The resulting non-ideal transfer function effectively becomes:

Where:

error. For example, if 1% resistors are used for the EL8171,

the total gain error would be:

Power Dissipation

It is possible to exceed the +150°C maximum junction

temperatures under certain load and power-supply

conditions. It is therefore important to calculate the

to determine if power supply voltages, load conditions, or

package type need to be modified to remain in the safe

operating area. These parameters are related in Equation 6:

where:

Equation 7:

where:

•

θ

application

V

OUT

1

R

F

R

G

--------

+

⎝⎠

⎜⎟

⎛⎞

1E

RG

E

RF

E

G

++

()

–

[] V

IN

×

×

=

(EQ. 4)

E

RG

E

RF

E

()

++

()

±

=

0.01

0.01

0.003

++

()

±

=

2.3%

±

=

(EQ. 5)

T

JMAX

T

MAX

θ

()

+

=

(EQ. 6)

PD

MAX

2*V

S

I

SMAX

V

S

(

- V

V

OUTMAX

R

L

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

×

+

×

=

(EQ. 7)

EL8171, EL8172