400_VOLT，60_WATT_PUSH_PULL_POWER_SUPPLY_

Published:2009/7/2 3:43:00 Author:May | From:SeekIC

Circuit Notes The design delivers a regulated 400-V, 60-W output. The TL494 switching regulator governs the opdrating frequency and regulates output voltage. R1 and C1 determine switching frequency, which is approximately 0.5RC-100 kHz for the values shown. The TL494 directly drives the FET's gates with a voltage-controlled, pulse-width-modulated signal. After fullwave rectification, the output waveform is filtered by a chokeinput arrangement. The 1 μH, 75 μF filter accomplishes the job nicely at 100 kHz. A feedback scheme using R4, R5 and R6 provides for outputvoltage regulation adjustment, with loop compensation handled by C2. Diodes D1 and D2 provide isolation and steering for the 33-V zener transient clamp, D3. Output regulation is typically 1.250/0 from noload to the full 60-W design rating. Regulation is essentially determined by the TL494. Output noise and ripple consists mainly of positive and negative 0.8-V spikes occurring when the output stage switches.



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