OPA189 Datasheet, PDF (25/34 Pages) Texas Instruments – Precision, 36-V, 14-MHz, MUX-Friendly Low-Noise, Rail-to-Rail Output, Zero-Drift Operational Amplifiers

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VSYSTEM
OPA189, OPA2189, OPA4189
SBOS830 – JUNE 2017
Load
ILOAD
RSHUNT
100 m
15 V
+
OPAx189
±
VOUT
VOUT = ILOAD * RSHUNT(1 + RF / RIN)
VOUT / ILOAD= 1 V / 49.75 mA
RIN
RF
100
20 k
CF
150
Copyright © 2017, Texas Instruments Incorporated
pF
Figure 16. Low-Side Current Monitor
9.2.6 Programmable Power Supply
Figure 17 shows the OPAx189 configured as a precision programmable power supply using the 16-bit, voltage
output DAC8581 and the OPA548 high-current amplifier. This application amplifies the digital-to-analog converter
(DAC) voltage by a value of five, and handles a large variety of capacitive and current loads. The OPAx189 in
the front-end provides precision and low drift across a wide range of inputs and conditions. Click the following
link to download the TINA-TI file: Programmable Power-Supply Circuit.
C1
500 nF
R1
10 k
GND
DAC8581
Input = ± 5V
R2
1k
C2
500 nF
+15V
±
R3
10 k
OPAx189
+
±15V
R4
40 k
+30V
±
OPA548
+
VOUT
Output = ± 25V
±30V
Copyright © 2017, Texas Instruments Incorporated
Figure 17. Programmable Power Supply
Copyright © 2017, Texas Instruments Incorporated
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Product Folder Links: OPA189 OPA2189 OPA4189