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