DN-25 integrated circuit switching voltage-stabilized power supply circuit

Published:2011/5/19 19:32:00 Author:Christina | Keyword: switching, voltage-stabilized, power supply circuit | From:SeekIC

After startup, the oscillator starts working, the output VF signal is reshaped and transformed by R-S trigger to produce a original frequency rectangular pulse excitation voltage, and the VF signal is amplified by the darlington circuit which is composed of th Q1 and Q2 then output by pin-2. You can adjust the output voltage V0 by adjusting the voltage of comparator reversed-phase input terminal pin-5. By changing pin-5's voltage, we can adjust R-S trigger excitation pulse width, and cause the changing of the output voltage Vo. This voltage-stabilized power supply VIN=25V,Vo=(1+RP/XVREF), the stability is 0.12%; the load regulation is 0.03%; the short-circuit limit current is IOSH=1.1A; the efficiency is η=82.50%; the ripple wave is less than 120mVp-p.



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