TOSHIBA F3SS color TV movement protection circuit

Published:2011/5/26 21:02:00 Author:Christina | Keyword: TOSHIBA, color TV, movement, protection circuit | From:SeekIC

1.+B line over-current protection circuit When the +B line is over-current, the current of R470 increases, the pressure drop of R470 increases. When the pressure drop of R470 makes the e electrode's voltage higher than b electrode (0.7V), the Q470 conducts. 2.+B over-voltage protection circuit When the +B line is over-voltage, the pulse voltage which is output by the line output transformer is rectified by D408, then is filtered by C449. 3.Field output over-current protection circuit When the output current is over-current, the pin-6's voltage of the supply field output integrated circuit Q301 reduces, the pressure drop of resistance R490 increases, the Q490 conducts, the D490 conducts, the D471 conducts, the Q838 conducts.



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