Datasheet

10
®
OPA241, 2241, 4241
OPA251, 2251, 4251
R
L
10Ω
A1
OPA241
+
R
1
38.3kΩ
R
3
38.3kΩ
R
5
383kΩ
R
6
10kΩ
R
7
9.09kΩ
R
4
20kΩ
R
2
19.1kΩ
A2
OPA241
R
8
100kΩ
R
H
10Ω
I
H
V+
V–
V+
V–
2.7V to ±15V
V+ for A
1
, A
2
–In
+In
–In
+In
V
O
= 10 • I
H
• R
H
To Load
To Load
V
O
= 10 • I
L
• R
L
Common-mode range of A2
extends to V– for low-side sensing.
Optional for I
B
Cancellation
(R
7
= R
6
II R
8
)
R
2
and R
4
divide down the
common-mode input to A1.
Low-Side
Current Sense
High-Side
Current Sense
Out
Out
NOTE: Low and high-side sensing circuits can be used independently.
V– for A
1
, A
2
I
L
FIGURE 5. Low and High-Side Battery Current Sensing.
R
S
5kΩ
OPA241
C
L
V
IN
V
OUT
FIGURE 4. Series Resistor in Unity Gain Configuration Improves Capacitive Load Drive.