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DAC8760IPWPR bảng dữ liệu(PDF) 46 Page - Texas Instruments

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tên linh kiện DAC8760IPWPR
Giải thích chi tiết về linh kiện  Single-Channel, 12- and 16-Bit Programmable Current Output and Voltage Output Digital-to-Analog Converters for 4-mA to 20-mA Current Loop Applications
PDF  63 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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DAC8760IPWPR bảng dữ liệu(HTML) 46 Page - Texas Instruments

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R1
R2
R3
R4
D1
Q1
Q2
VIN
VOUT
46
DAC7760, DAC8760
SBAS528B – JUNE 2013 – REVISED JUNE 2016
www.ti.com
Product Folder Links: DAC7760 DAC8760
Submit Documentation Feedback
Copyright © 2013–2016, Texas Instruments Incorporated
Application Information (continued)
Figure 95. Unidirectional Current Limiter Circuit
Under normal operation, most current in this circuit flows through Q1 and into R3. As current increases through
R3, so does the voltage drop across R3, which increases the base-emitter voltage of Q2. Eventually the base-
emitter voltage of Q2 becomes high enough to turn on Q2, which turns off Q1 and reduce the current that can
pass from VIN to VOUT. The value of R3 sets the current limit. Note that this is a very simple example and only
applies for sourcing current into a resistive load. For cases involving both sourcing and sinking current as well as
nonresistive loads, more complex circuits are required to achieve bidirectional current limiting.



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