SIPMOS transistor control circuit using optical isolation

Published:2011/11/23 2:20:00 Author:May | Keyword: SIPMOS transistor, control, optical isolation | From:SeekIC

When TDA4700's output transistor is breaking over, optoelectronic isolator is breaking over. R1 is used for limitting the current, its value's sending and getting must make light coupled input end have about 4mA current. Diode D1 is used for limitting reverse over voltage when it is cut off. The input end of light coupling output gate circuit is connecting with ground through resistor R2 in order to make its output endbe open circuit when the power supply voltage drops to 4V. That is two push pull circuits's output transistor keeps on the cutting off state. It can make light coupling output to be low level when power supply voltage increases to about 3V in order to make back connecting six inverter 4096to control SIPMOS transistor. When it is working, light coupling end is open, it can make six inverter output end be in high level, but its output end is in low level.



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