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FDS2570 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FDS2570 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 12 page 3 Rev. A, June 2001 ©2001 Fairchild Semiconductor Corporation Figure 2. Typical waveforms for the flyback regulator. Single Transistor Forward Converters The forward converter achieves much better transformer utilization than the flyback design since in theory, the transformer stores no energy. There is an extra inductor in the output power path and an additional diode as well. Single transistor forward converters are useful in 48V system designs, up to 150 watts or so. A similar problem exists in the forward converter as in the flyback design because the drain voltage is inherently unconstrained. Leakage nductance in the power transformer will produce large voltage spikes that must be snubbed or clamped. VGS -VSPIKE -VIN + VFB -VIN VDS ID(Q1) ID1 VSW VIN IPK 0 TIME SW ON VSAT VFLBK IPRI 0 TIME ISEC 0 TIME PWM'ED EDGE |
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