 English |
|
|
|
|
|
|
|
| OPA454 Datasheet, PDF (25/36 Pages) Texas Instruments – High-Voltage (100V), High-Current (50mA) OPERATIONAL AMPLIFIERS, G = 1 Stable | |||
| |||
| ◁ |
www.ti.com
Figure 74 uses three OPA454s to create a
high-voltage instrumentation amplifier. VCM ± VSIG
must be between (Vâ) + 2.5V and (V+) â 2.5V. The
maximum supply voltage equals ±50V or 100V total.
Figure 75 uses three OPA454s to measure current in
a high-side shunt application. VSUPPLY must be
greater than VCM. VCM must be between (Vâ) + 2.5V
and (V+) â 2.5V. Adhering to these restrictions keeps
V1 and V2 within the voltage range required for linear
operation of the OPA454. For example, if V+ = 50V
VSIG
and Vâ = 50V, then V1 = +47.5V (maximum) and
V2 = â47.5V (minimum). The maximum supply
voltage equals ±50V, or 100V total.
See Figure 76 and Figure 79 for example circuits that
use the OPA454 in an output voltage boost
configurations in three and six op amp output stages,
respectively.
VCM
OPA454
V+
V1
OPA454
A1
V-
R2
SBOS391 â DECEMBER 2007
R4
R5
V+
R1
R2
V+
OPA454
A3(1)
VOUT
V-
R6
R7
OPA454
A2
V2
V-
VOUT = (1 + 2R2/R1) (V2 - V1)
(1) The linear input range is limited by the output swing on the
input amplifiers, A1 and A2.
Figure 74. High-Voltage Instrumentation Amplifier
RSHUNT
VSUPPLY
Plus
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 75. High-Voltage Instrumentation Amplifier for Measuring High-Side Shunt
Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): OPA454
Submit Documentation Feedback
25
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese