Toshiba small flat coupler TLP181(p181) is a small external coupler, which is suitable for patch mounting. TLP 18 1 includes an optical transistor, which is optically coupled with a gallium arsenide infrared light emitting diode.
The operating voltage and current of optocoupler p52 1 are 1.2V and 10mA, respectively. It consists of two photoelectric couplers T 1 and T2 with the same nonlinear transmission characteristics and two emitter followers A 1 and A2.
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Principle and testing method of optical coupler P 18 1.
P 18 1 is a four-pin optical coupler, 1, 2 pins are input terminals, and 3 pins and 4 pins are output terminals. First of all, static detection, using a digital meter to measure 1, 2 feet, there will be a pipeline pressure drop of about 1. 1 in the forward direction and infinity in the reverse direction. The output end uses a resistor, and the forward and reverse directions are infinite. Generally, the optical coupler is damaged, and the output resistance is obviously reduced, so it can be replaced.
Then power on the test, and add a voltage of about 1 .0-1.5v to the input terminal1.5v (with or without current limiting resistor). At the output terminals 3 and 4, the resistance measured by the resistance file will obviously decrease, which proves to be good. If it doesn't drop significantly to bad, replace it.