OPA333A

ADS1100

Load

V

R

1

4.99k

Ω

R

3

4.99k

Ω

R

4

48.7k

Ω

R

2

49.9k

Ω

+5V

3V

REF3130

R

7

1.18k

Ω

R

SHUNT

1

Ω

R

6

71.5k

Ω

R

N

56

Ω

R

N

56

Ω

(PGA Gain = 4)

FS = 3.0V

NOTE: 1% resistors provide adequate common−mode rejection at small ground−loop errors.

Stray Ground−Loop Resistance

I

LOAD

OPA333A

Output

R

SHUNT

Load

V+

V+

R

G

R

L

R

1

(2)

10k

Ω

R

BIAS

+5V

Two zener

biasing methods

MOSFET rated to

stand−off supply voltage

such as BSS84 for

up to 50V.

(1) zener rated for op amp supply capability (that is, 5.1V for OPA333).

(2) Current−limiting resistor.

(3) Choose zener biasing resistor or dual NMOSFETS (FDG6301N, NTJD4001N, or Si1034)

NOTES:

OPA333A-EP

,, OPA2333A-EP

Figure 5. Low-Side Current Monitor

Figure 6. High-Side Current Monitor

Copyright © 2007–2008, Texas Instruments Incorporated

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Product Folder Link(s): OPA333A-EP OPA2333A-EP