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LM234Z Scheda tecnica(PDF) 1 Page - STMicroelectronics |
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LM234Z Scheda tecnica(HTML) 1 Page - STMicroelectronics |
1 / 16 page May 2007 Rev 3 1/16 16 LM134-LM234-LM334 Three terminal adjustable current sources Features ■ Operates from 1V to 40V ■ 0.02%/V current regulation ■ Programmable from 1µA to 10mA ■ ±3% initial accuracy Description The LM134/LM234/LM334 are 3-terminal adjustable current sources characterized by: ■ an operating current range of 10000: 1 ■ an excellent current regulation ■ a wide dynamic voltage range of 1V t 10V The current is determined by an external resistor without requiring other external components. Reverse voltages of up to 20V will only draw a current of several microamperes. This enables the circuit to operate as a rectifier and as a source of current in a.c. applications. For the LM134/LM234/LM334, the voltage on the control pin is 64mV at +25°C and is directly proportional to the absolute temperature (°K). The simplest external resistor connection generates a current with approximately 0.33%/°C temperature dependence. Zero drift can be obtained by adding an additional resistor and a diode to the external circuit. Z TO-92 (Plastic package) D SO-8 (Plastic micropackage) ADJ v+ v- 21 3 TO-92 (Bottom view) 8765 1234 NC NC V- NC ADJ NC NC V+ SO-8 (Top view) Pin connections www.st.com |
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