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FDS3670 датащи(PDF) 8 Page - Fairchild Semiconductor |
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FDS3670 датащи(HTML) 8 Page - Fairchild Semiconductor |
8 / 12 page 8 Rev. A, June 2001 ©2001 Fairchild Semiconductor Corporation Figure 9. Voltage and current waveforms for the basic push-pull design. Full-Bridge Designs Full-bridge designs, sometimes called four transistor bridges, are generally used at very high power levels, mainly due to the cost of these designs. Two of the four switches have floating sources, so they each require an isolated gate drive, usually transformer coupled. The power transformers primary winding design is a simple single winding. The secondary, is generally center-tapped, at least for very low output voltage designs. The main advantage of the bridge topology is that the drain voltages of all four switches are constrained to Vin. Energy in the transformer’s leakage inductance gets returned to the input and can help force commutate the switches. The switches get turned on across a diagonal of the bridge. Figure 10 shows the basic circuit design, and Figure 11 shows the idealized waveforms. Since the drain voltage is well clamped to Vin without snubbers, there is no concern for passive energy losses. This also allows the use of the 80V, FDS3570 in all four locations. With these devices, output power VGS(Q2) VGS(Q1) PWM'ED EDGE -2VIN -VIN VDS(Q1) VDS(Q2) D1(ANODE) D2(ANODE) IL1 I0 VSW VSAT IPK 0 TIME SW2 SW1 2VIN VIN IPRI 0 TIME IMIN |
Аналогичный номер детали - FDS3670 |
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Аналогичное описание - FDS3670 |
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