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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DAC8760IPWPR датащи(PDF) 46 Page - Texas Instruments |
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DAC8760IPWPR датащи(HTML) 46 Page - Texas Instruments |
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46 / 63 page  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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