VARIABLE_DUTY_CYCLE

Published:2009/7/1 20:02:00 Author:May | From:SeekIC

First section of Exar XR-2556 dual timer operates as astable MVBR whose frequency is equal to 1.44/(RA + 2RB)C1, with output used to trigger timer 2 connected in monostable mode. Time delay T2 of timer 2 is made less than period of timer 1 waveform, so both timers have same frequency. Duty cycle is determined by timing cycle of timer 2, adjustable from 1% to 99% with R2. Supply voltage is 4.5-16 V.- Timer Data Book, Exar Integrated Systems, Sunnyvale, CA, 1978, p 23-30.



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