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FDS3570 датащи(PDF) 6 Page - Fairchild Semiconductor

номер детали FDS3570
подробное описание детали  Power Converter Topology and MOSFET Selection for 48-V Telecom
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производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FDS3570 датащи(HTML) 6 Page - Fairchild Semiconductor

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6
Rev. A, June 2001
©2001 Fairchild Semiconductor Corporation
becomes a current source that forward biases diodes D1 and D2, returning the energy stored
in the transformer’s primary to the input capacitor. No snubbers or clamps are required, and
the maximum off voltage the primary side FET will see is the input voltage, plus a couple of
diode drops. Therefore, the 80V FDS3570 is useful in designs that will never have the input
exceed of 76V. The 100V FDS3670 will provide a little more design margin if desired. All wave-
forms are essentially similar to Figure 5 except the FET’s drain voltages, which are shown in
Figure 7.
Figure 6. Two transistor forward converter.
Figure 7. Voltage and current waveforms for two transistor forward converter.
Note that the primary current is the same as the single transistor design example above.
However, the FDS3570 has an on-resistance of only 15% than that of the 200V FDS2670
(20m
Ω vs. 130 mΩ). Even with two transistors in series, the net on-resistance is still much
lower than the single high-voltage transistor, so a higher power level can be obtained.
Efficiency will also be several percentage points higher than the single transistor design since
the energy that would be dissipated in snubbers and clamps is, in this case, recovered to the
input capacitor. Using the FDS3670’s maximum RMS current rating of 9 amps, an assumed
efficiency of 83% with 36V in, and a maximum 45% duty factor, gives a maximum output
power of 180 watts. Again, it is permissible to parallel FETs in an effort to lower the conduction
losses and raise the useable output power of the converter.
D1
D2
T1
D3
D4
Q1
Q2
Isolation
Input
Gate
GND
U1
PWM
Gate
Source
GND
RTN
C2
L1
+
C1
+
VOUT
VIN
VGS(Q1TQ2)
-VIN
-Can Vary From
0 to VIN
VSD(Q1TQ2)


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