11

®

INA146

FIGURE 7. Current Monitor, G = 1.

FIGURE 8. Comparator Output with Optional Hysteresis Application to Sense Lamp Burn-Out.

FIGURE 9. AC Coupling (DC Restoration).

FIGURE 10. Precision Current Source.

V

O

1V – 50mV

+5V

1

Ref

48

6

8.4k

Ω

INA146

5

7

Feedback

2

3

10M

Ω

8k

Ω

10k

Ω

1V

2k

Ω

Lamp

24V

SHUNT

R-I Lamp/10

e.g., 0.1

Ω for 1A

V

O

V

O1

18

6

R

G1

11k

Ω

R

C

100

Ω

R

S

100

Ω

R

G2

100k

Ω

INA146

5

2

Power

Supply

Load

3

For sense resistors (R

greater than 10

Ω, use

series compensation

resistor (R

common-mode rejection.

Sense resistors greater

than 500

Ω are not

recommended.

V

O

1

R

G1

11k

Ω

R

G2

100k

Ω

R

1

1M

Ω

INA146

OPA277

5

2

3

C

1

0.1

µF

V

IN

–

V

IN

+

Pole at

f =

= 1.6Hz

1

2

πR

V

O

I

V

O1

18

6

R

G2

10k

Ω

10k

Ω

INA146

5

2

3

V

IN

–

+

V

IN

+