LT6107

10

6107fb

APPLICATIONS INFORMATION

power dissipation is 41mW. This amount of power dis-

sipation will result in a 10°C rise in junction temperature

above the ambient temperature.

It is important to note that the LT6107 has been designed

to provide at least 1mA to the output when required, and

can deliver more depending on the conditions. Care must

be taken to limit the maximum output current by proper

ditions exist, external clamps.

Output Filtering

makes filtering straightforward. Any circuit may be used

will give a lowpass response. This will reduce unwanted

noise from the output, and may also be useful as a charge

reservoir to keep the output steady while driving a switch-

ing circuit such as a MUX or ADC. This output capacitor

in parallel with an output resistor will create a pole in the

output response at:

f

RC

dB

OUT

OUT

–

••

•

3

1

2

=

π

Useful Equations

Voltage

SENSE

SENSE

•

G

Gain:

V

R

R

SENSE

OUT

IN

=

Current Gain:

I

Transcond

OUT

I

R

R

SENSE

SENSE

IN

=

u

uctance:

I

Transimpedance:

V

OUT

O

VR

SENSE

IN

=

1

U

UT

I

R

R

R

SENSE

SENSE

OUT

IN

=

•

Power Supply Connection

either side of the sense resistor. Either connection will

Referring to Figure 5, feedback will force the voltages

end of the shunt results in the voltages at +IN and –IN to

resistor, the supply current drawn by the LT6107 is not

nected to the load side of the shunt resistor (Figure 5),

the supply current drawn by the LT6107 is included in

the monitored current. It should be noted that in either

configuration, the output current of the LT6107 will not

connected to the positive side of the shunt. Contact the

the recommended operating range.

Figure 5. LT6107 Supply Current Monitored with the Load

Reverse Supply Protection

Some applications may be tested with reverse-polarity

supplies due to an expectation of the type of fault during

operation. The LT6107 is not protected internally from ex-

ternal reversal of supply polarity. To prevent damage that

may occur during this condition, a Schottky diode should

reverse current through the LT6107. Note that this diode

will limit the low voltage performance of the LT6107 by ef-

LT6107

6107 F05

LOAD

OUT

–IN

+IN