3-Terminal Adjustable Current Sources
LM134/LM234/LM334 3-Terminal Adjustable Current Sources
March 2000
LM134/LM234/LM334 3-Terminal Adjustable Current Sou...
Description
LM134/LM234/LM334 3-Terminal Adjustable Current Sources
March 2000
LM134/LM234/LM334 3-Terminal Adjustable Current Sources
General Description
The LM134/LM234/LM334 are 3-terminal adjustable current sources 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 LM134/LM234/LM334 are 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. Z...
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