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This IC in a TO92 package is a 3-terminal adjustable current source with a 10,000 to 1 range in operating current, excellent current regulation and a wide dynamic voltage regulation of 1V to 40V. Current is established with one resistor connected between pins 1 (R) and 3 (V-), and no other parts are required. The current is equal to 0.0677V divided by the resistor in ohms (i.e. for 1mA, R = 68 ) at 25°C. Currents may be set in the range 1╡A to 10mA and regulation is 0.02% per volt. Initial current accuracy is ▒3% typical. Reverse voltages of up to 20V will draw only a few microamps allowing the device to act as a rectifier and current source in AC applications. The current is also directly proportional to the temperature at the rate +0.33% per °C. Zero drift operation can be obtained by adding one resistor and one diode. Applications include bias networks, surge protection, low power reference, ramp generation, LED driver, and temperature sensing. |
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