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| OPA454_16 Datasheet, PDF (31/47 Pages) Texas Instruments – High-Voltage (100-V), High-Current (50-mA) Operational Amplifiers | |||
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OPA454
SBOS391B â DECEMBER 2007 â REVISED MARCH 2016
System Examples (continued)
10.3.5 High-Voltage Instrumentation Amplifier
Figure 79 uses three OPA454s to create a high-voltage instrumentation amplifier. VCM ± VSIG must be between
(Vâ) + 2.5 V and (V+) â 2.5 V. The maximum supply voltage equals ±50 V or 100 V total.
V+
V1
OPA454
A1
R4
R5
V-
R2
V+
VSIG
R1
R2
V+
OPA454
A3(1)
VOUT
V-
R6
R7
OPA454
A2
V2
VOUT = (1 + 2R2/R1) (V2 - V1)
VCM
V-
(1) The linear input range is limited by the output swing on the input amplifiers, A1 and A2.
Figure 79. High-Voltage Instrumentation Amplifier
Figure 80 uses three OPA454s to measure current in a high-side shunt application. VSUPPLY must be greater than
VCM. VCM must be between (Vâ) + 2.5 V and (V+) â 2.5 V. Adhering to these restrictions keeps V1 and V2 within
the voltage range required for linear operation of the OPA454. For example, if V+ = 50 V and Vâ = 50 V, then
V1 = +47.5 V (maximum) and V2 = â47.5 V (minimum). The maximum supply voltage equals ±50 V, or 100 V
total.
RSHUNT
Plus
VSUPPLY
or
Minus
V+
V1
OPA454
A1(1)
R4
R5
V-
R2
V+
Load
R1
R2
V+
OPA454
A3(2)
VOUT
V-
R6
R7
OPA454
V2
A2(1) VOUT = (1 + 2R2/R1) (V2 - V1)
V-
(1) To increase the linear input voltage range, configure A1 and A2 as unity-gain followers.
(2) The linear input range is limited by the output swing on the input amplifiers, A1 and A2.
Figure 80. High-Voltage Instrumentation Amplifier for Measuring High-Side Shunt
Copyright © 2007â2016, Texas Instruments Incorporated
Product Folder Links: OPA454
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