Switching_regulator_using_a_timer

Published:2009/7/25 0:21:00 Author:Jessie | From:SeekIC

This circuit uses an LM122 timer to provide switching regulation. (The internal reference and comparator of the timer are used to drive a pnp switch transistor). Circuit features include a 5.5-V minimum input voltage at 1-A output current, low parts count, and good efficiency (greater than 75% ) for input voltages up to 10 V. Output ripple at the switching frequency is about 30 mV. Other values for Vout can be obtained with corresponding values of R2, R3, R4, and R5.



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