поискавой системы для электроныых деталей |
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FDS2670 датащи(PDF) 5 Page - Fairchild Semiconductor |
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FDS2670 датащи(HTML) 5 Page - Fairchild Semiconductor |
5 / 12 page 5 Rev. A, June 2001 ©2001 Fairchild Semiconductor Corporation Figure 5. Voltage and current waveforms for a single transistor forward converter. The average switch current in a Forward converter is equal POUT/ηVIN where POUT is the max- imum output power, η is the efficiency, and VIN is the minimum input voltage. With a maximum rating of 3 amps for the FDS2670 and assuming an efficiency of 80%, the maximum output power that can be obtained with a single primary-side FET is approximately 80W. Utilizing two FDS2670 devices in parallel are therefore capable of a theoretical output power of about 160 watts. Note the instantaneous peak switch current is going to be 2.5 to 5 times higher than the average current, depending on the input voltage range. The wider the input voltage range, the higher the peak switch current. Two Transistor Forward Converters For still higher power levels, up to about 200 watts, the two transistor forward converter of Figure 6 is a good choice. The basics of the circuit’s operation are similar to the single transistor design. The difference is that the leakage inductance’s energy, and therefore, the drain voltage, is no longer unconstrained. During the off state, the transformer’s primary VGS(Q1) -VSPIKE -VRESET -VIN VDS(Q1) ID(Q1) ID1 ID2 IL1 IOUT VSW VSAT 2VIN IPK 0 TIME SW ON IPRI 0 TIME IMIN PWM'ED EDGE |
Аналогичный номер детали - FDS2670 |
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Аналогичное описание - FDS2670 |
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