RS
5kΩ
OPA241
VOUT
VIN
CL
FIGURE 4. Series Resistor in Unity Gain Configuration Improves Capacitive Load Drive.
RH
10Ω
To Load
R5
383kΩ
IH
High-Side
Current Sense
R3
38.3kΩ
R1
V+
38.3kΩ
–In
+In
Out
A1
OPA241
VO = 10 • IH • RH
V–
V+ for A1, A2
R4
20kΩ
R2
19.1kΩ
+
R
2 and R4 divide down the
2.7V to ±15V
R8
100kΩ
common-mode input to A1.
V– for A1, A2
V+
–In
A2
OPA241
Out
VO = 10 • IL • RL
+In
Low-Side
Current Sense
V–
R7
9.09kΩ
Common-mode range of A2
extends to V– for low-side sensing.
R6
10kΩ
RL
10Ω
Optional for IB Cancellation
(R7 = R6 II R8)
To Load
IL
NOTE: Low and high-side sensing circuits can be used independently.
FIGURE 5. Low and High-Side Battery Current Sensing.
®
OPA241, 2241, 4241
10
OPA251, 2251, 4251
TI [ TEXAS INSTRUMENTS ]
