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TLV2186 数据表(PDF) 23 Page - Texas Instruments

部件名 TLV2186
功能描述  TLV2186 Precision, Rail-to-Rail Input and Output, 24-V, Zero-Drift Operational Amplifier
Download  39 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TLV2186 数据表(HTML) 23 Page - Texas Instruments

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+
±
+ 24 V ±
VO = 300 mV to 3.3 V
+
24 V
±
RL = 10 m
R1 = 1 k
R2 = 30 k
R3 = 1 k
R4 = 30 k
TLV2186
IL
Load Current
1 A to 11 A
µController
ADC
+ 3.3 V ±
:
OMIN
A
SMIN
S
OMIN
V
G
* I
* R
V
V
30
* 1 A * 10 m
300 mV
V
OMAX
A
S
A
V
G
V
3.3 V
V
G
30
0.11 V
V
:
S
L
S
S
V
I * R
V
11 A * 10 m
110 mV
23
TLV2186
www.ti.com
SBOS947A – JULY 2019 – REVISED JUNE 2020
Product Folder Links: TLV2186
Submit Documentation Feedback
Copyright © 2019–2020, Texas Instruments Incorporated
Typical Applications (continued)
The TLV2186 is powered by 24 V; therefore, the device is easily capable of providing the 3.3-V positive level, or
even more if the ADC has a wider input range. However, because the TLV2186 output does not swing
completely to 0 V, the specified lower swing limit must be observed in the design.
The best measure of an op amp linear output voltage range comes from the open-loop voltage gain (AOL)
specification listed in the Electrical Characteristics table. The AOL test conditions specify a linear swing range 300
mV from each supply rail (RL = 10 kΩ). Therefore, the linear swing limit on the low end (VoMIN) is 300 mV, and
3.3 V is the VoMAX limit, thus yielding an 11:1 VoMAX to VoMIN ratio. This ratio proves important in determining the
difference amplifier operating parameters.
An optimum load current, ILOAD of 10 A is used as an example. In most applications, however, the ability to
monitor current levels well below 10 A is useful. This situation is where the 11:1 VoMAX to VoMIN ratio is crucial. If
11 A is set as the maximum current, this current must correspond to a 3.3-V output. Using the 11:1 ratio, the
minimum current of 1 A corresponds to 300 mV.
Selection of the current sense resistor RS comes down to how much voltage drop can be tolerated at maximum
current and the permissible power loss, or dissipation. A good compromise for a 10-A sense application is an RS
of 10 m
Ω. That value results in a power dissipation of 1 W, and a 0.1-V drop at 10 amps.
Next, determine the gain of the TLV2186 difference amplifier circuit. The maximum current of 11 A flowing
through a 10-m
Ω sense resistor results in 110 mV across the resistor. That voltage appears as a differential
voltage, VR, that is applied across the TLV2186 difference amplifier circuit inputs:
(1)
The TLV2186 required voltage gain is determined from:
(2)
Now, checking the VoMIN using IL = 1 A:
(3)
The complete TLV2186 high-side current monitor is shown in Figure 45. The circuit is capable of monitoring a
current range of < 1 A to 11 A, with a VCM very close to the 24-V supply voltage.
Figure 45. TLV2186 Configured as a High-Side Current Monitor


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