DAC7760IPWPR datasheet(46/63 Pages) TI1

Part #	DAC7760IPWPR

Description	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

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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46 / 63 page

VIN

VOUT

DAC7760, DAC8760

SBAS528B – JUNE 2013 – REVISED JUNE 2016

www.ti.com

Product Folder Links: DAC7760 DAC8760

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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.

DAC7760IPWPR Datasheet(PDF) 46 Page - Texas Instruments