- Operates between 1V and 40V
- 0.02%/V current regulation
- Programmable from 1μA to 10mA
- True 2-end operation
- Can be used as a fully specified temperature sensor
- Initial accuracy of ± 3%
illustrate
The LM134/LM234/LM334 are three-terminal adjustable operating currents, featuring excellent current regulation and a wide dynamic voltage range from 1V to 40V, with a 10000:1 current source. Currently, an external resistor is being built, and no other one is necessary. The initial current accuracy is ± 3%. The LM134/LM234/LM334 are truly floating, with no separate power supply connection to the current source. Additionally, reverse voltages up to 20V will allow applications with only a few tens of microamperes to carry current, allowing devices to serve as both rectifiers and current sources in AC applications.
This detection voltage is used to establish the LM134 operating current of 64mV at 25°C, which is proportional to the absolute temperature (°K). The simplest is an external resistor connected to generate a temperature-dependent current with [about] 0.33%/°C. Zero drift can be operated by adding an extra resistor and a diode.
Applications for current sources include bias networks, surge protection, low-power references, apron generation, LED drivers, and temperature sensors. The LM234-3 and LM234-6 are designated as guaranteed ± 3°C and ±6°C, respectively, as initial accuracy true temperature sensors. These devices are ideal for remote sensing applications, as the long-range running resistance in the series does not compromise accuracy. In addition, only 2 lines are required.
The LM134 is guaranteed within a temperature range of -55°C to +125°C, from -25°C to +100°C, and from 0°C to +70°C. These devices are available in TO-46 sealed, TO-92, and SO-8 plastic packages.
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