LM334Z

TEXAS INSTRUMENTS  LM334Z.  芯片, ADJUSTABLE CURRENT SOURCE [ROHS Substitute: 9488065]

The LM334 is a 3-terminal adjustable current source featuring 10,000:1 range in operating current, excellent current regulation and a wide dynamic voltage range of 1V to 40V. Current is established with one external resistor and no other parts are required. Initial current accuracy is ±3%. The LM334 is a true floating current sources with no separate power supply connections. In addition, reverse applied voltages of up to 20V will draw only a few dozen microamperes of current, allowing the devices to act as both a rectifier and current source in AC applications. The sense voltage used to establish operating current in the LM134 is 64mV at 25°C and is directly proportional to absolute temperature °K. The simplest one external resistor connection, then, generates a current with +0.33%/°C temperature dependence. Zero drift operation can be obtained by adding one extra resistor and a diode.

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0.02%/V current regulation

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Programmable from 1µA to 10mA

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True 2-terminal operation

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Available as fully specified temperature sensor

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±3% initial accuracy