80_V_AT_15_A_FOR_COLOR_TV

Published:2009/7/17 0:13:00 Author:Jessie | From:SeekIC

Holds output voltage across RL within 2% over line-voltage range of 105 to 140 V. Designed for use in 19-inch color TV receiver having 700-V fly back horizontal system. Bridge rectifier has two 2N4442 SCRs that control amount of output voltage by using variable duty cycle. Regulator uses MPU131 programmable UJT, which also serves for gating SCRs. 1K pot provides control of PUT gate voltage, which in turn determines output voltage across RL.-R. J. Valentine, A Low-Cost 80 V-1.5 A Color TV Power Supply, Motorola, Phoenix, AZ, 1974, AN-725, p 2.



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