Datasheet

OPA333A
ADS1100
Load
V
I
2
C
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
zener
(1)
Two zener
biasing methods
are shown.
(3)
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:
OPA333-Q1
www.ti.com SBOS522 –JUNE 2010
Figure 5. Low-Side Current Monitor
Figure 6. High-Side Current Monitor
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 11
Product Folder Link(s): OPA333-Q1