LM234Z-6

• Operation from 1V to 40V
• 0.02%/V current regulation
• Programmable from 1μA to 10mA
• True 2-end operation
• Available as a fully specified temperature sensor
• Initial accuracy of ± 3%

illustrate

The LM134/LM234/LM334 features a 3-terminal adjustable working current, excellent current regulation and a wide dynamic voltage range of 10000:1 for a current source in the range of 1V to 40V. An external resistor is currently built, and no other place is required. The initial current accuracy is ± 3%. The LM134/LM234/LM334 are truly floating and do not have a separate power connected current source. In addition, using a reverse voltage of up to 20V will only provide a few tens of microamps, thus serving as a current source for both rectifiers and AC applications.

The detection voltage is used to establish a current operating at 25°C 64mV at LM134, which is proportional to the absolute temperature (°K). The simplest is to connect an external resistor and then generate a temperature-dependent current of [approximate] +0.33%/°C. Zero drift operation can be done by adding an additional resistor and diode.

Applications for current sources include bias networks, surge protection, low-power references, tarmac generations, LED drivers, and temperature sensing. The LM234-3 and LM234-6 are specified as true temperature sensors with guaranteed ± 3°C and ±6°C respectively. These devices are ideal for remote sensing applications because of the series of operation of long wire resistors without compromising accuracy. In addition, only 2 lines are required.

The LM134 guarantees a temperature range of 125°C at -55°C, from -25°C to +100°C and from 0°C to +70°C for the LM234 and LM334 from 0°C to +70°C The devices are available in TO-46 sealed TO-92 and SO-8 plastic packages.