2_V_TO_2O_AND_15O_V

Published:2009/6/30 2:02:00 Author:May | From:SeekIC

Use of 7-turn toroidal transformer in self-excited dnging-choke blocking-oscillator circuit improves efficiency of converter circuit by providing fast switching time. Circuit is practical only when input and output voltages differ signfficantly. Blocking oscillator is formed by Q1, T2, C1, R2, and base-bias network R6-Q2. Q4 makes possible external synchronization, permitting use in television systems for triggering regulator with leading edge of horizontal drive pulse. This ensures completion of cycle within blanking interval.—N. Tkacenko, Transformer Increases DC-DC Converter Efficiency to 80%, EDN Magazine, May 5, 1976, p 110 and 112.



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