CIRCUIT DEVICE FOR PROTECTING THE END STAGE OF AN INTEGRATED CIRCUIT POWER AMPLIFIER FOR THE VERTICAL DEFLECTION OF A TELEVISION KINESCOPE

摘要

P A T5, T6 CURRENT MIRROR WITH A REFLECTION RATIO OF GREATER THAN 1, IS MOUNTED AS THE ACTIVE LOAD OF THE T1 DIFFERENTIAL AMPLIFIER, T2 INPUT OF THE POWER AMPLIFIER USUAL CURRENT MIRROR T3, T4 WHICH IS MOUNTED AT THE OUTPUT OF THE FINAL TRANSISTOR OF THE FINAL FLOOR T8, T11. IT PERCEIVES THE IMBALANCE OF THE VOLTAGE PIC WHICH HAPPENS AT THE REVERSE INPUT OF THE DIFFERENTIAL AMPLIFIER FROM THE BEGINNING OF THE FRONT DESCENDING FROM THE RAMP OF THE SAW TOOTH INPUT SIGNAL RAMP AND IT CONTROLS A T12 TRANSISTOR CONNECTED TO THE BASE OF THE PILOT TRANSISTOR, SO THAT THE POWER TRANSISTOR OF THE LOWER SECTION OF THE FINAL FLOOR IS FORBIDDEN. PROTECTION INTERVENES BEFORE THE OUTPUT HAS REACHED THE LEVEL OF THE SUPPLY VOLTAGE. /P