_5_V_TO__15_V

Published:2009/7/14 4:32:00 Author:May | From:SeekIC

Use of switching regulator for voltage conversion permits generation of higher output voltage along with polarity reversal. LM311 operates as free-running MVBR with low duty cycle. Frequency is determined by C1 and R5 and duty cycle by divider R3-R4. Extra loop function performed by Q1 and zener operating in conjunction with resistor network modifies oscillator duty cycle until desired out-put level is obtained. Nominal frequency is 6 kHz, duty cycle is 20% for -15 V output, and maximum load current is 200 mA. Design equations are given.-H, Mortensen, IC Comparator Converts +5 to -15V DC, EDN Magazine, Dec. 20, 1973, p 78-79.



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