LM334 - 3 端子可调节电流源

LM334是TI德州仪器公司的一款电流基准产品，LM334是3 端子可调节电流源，本站介绍了LM334的封装应用图解、特点和优点、功能等，并给出了与LM334相关的TI元器件型号供参考。

LM334 - 3 端子可调节电流源 - 电流基准 - 电压基准 - 德州仪器

产品描述

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. Zero drift operation can be obtained by adding one extra resistor and a diode.

Applications for the current sources include bias networks, surge protection, low power reference, ramp generation, LED driver, and temperature sensing. The LM234-3 and LM234-6 are specified as true temperature sensors with ensured initial accuracy of ±3°C and ±6°C, respectively. These devices are ideal in remote sense applications because series resistance in long wire runs does not affect accuracy. In addition, only 2 wires are required.

The LM134 is specified over a temperature range of −55°C to +125°C, the LM234 from −25°C to +100°C and the LM334 from 0°C to +70°C. These devices are available in TO hermetic, TO-92 and SOIC-8 plastic packages.

产品特性

Operates From 1V to 40V
0.02%/V Current Regulation
Programmable From 1µA to 10mA
True 2-Terminal Operation
Available as Fully Specified Temperature Sensor
±3% Initial Accuracy

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