The photoelectric coupling separation amplifier circuit of push-pull circuit improvement

Published:2011/7/4 20:04:00 Author:Borg | Keyword: photoelectric coupling, amplifier, push-pull circuit | From:SeekIC

See as the figure, this is the photoelectric coupling separation amplifier circuit of push-pull circuit improvement: the forward current of the LED in the coupler is not in total proportion to the transistor electrode current, therefore, TLP521（1）and TLP521（2）are used to fulfill the push-full function in the circuit, the input and output feature of the 2 lines are integrated. A1 is the phase reverser, whose output voltage changes the emitting pole currents of VT1 and VT2, the LED is connected with its collecting electrode. The output voltage is converted into the forward bias current according to the input voltage, i.e constant current drive.



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