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FDS3670 Datasheet(PDF) 2 Page - Fairchild Semiconductor

No. de pieza FDS3670
Descripción Electrónicos  Power Converter Topology and MOSFET Selection for 48-V Telecom
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FDS3670 Datasheet(HTML) 2 Page - Fairchild Semiconductor

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2
Rev. A, June 2001
©2001 Fairchild Semiconductor Corporation
Figure 1. Simplified flyback regulator schematic.
For 36- to 72-V input designs, the FDS3670, 100V MOSFET is the lowest voltage part that
should be used. Even then, the drain voltage will have to be carefully controlled with some
form of primary side clamp circuit. If the input supply can be expected to experience transient
voltages on the order of 100V, the 150V FDS2570 should be considered. It is important to
note, two devices would have to be connected in parallel to maintain the same power level that
can be achieved with a single FDS3670.
The off-state voltage is determined by the input voltage, output voltage, transformer turns ratio,
transformer leakage inductance, and snubber/clamp circuit. Ignoring the effects of leakage
inductance, the off voltage is equal to the input voltage plus the output voltage multiplied by the
transformer turns ratio. As an example, assuming a 1:1 turns ratio and a 5V output, the off-
state drain voltage is equal to Vin plus 5V. The effects of leakage inductance complicate the
matter considerably. The energy stored in the leakage inductance is equal to LI2/2, where L is
the leakage inductance and I is the peak primary current. This energy appears as a voltage
impressed on the various stray capacitances around the circuit. The energy is equal to CV2/2
and, therefore, Vpk=Ipk(L/C)
1/2. The problem is complicated by the fact that most of the stray
capacitances are nonlinear and vary greatly as a function of the instantaneous voltage
applied. As such, an empirical approach to designing the snubbers and clamps is generally
used. Figure 2 shows typical waveforms for the flyback regulator. Generally in a 48V
application, the maximum useful power level for a flyback design will be around 20 to 30 watts.
Above that, consider a single transistor forward converter as shown in Figure 3.
Gate
Q1
RTN
C2
D1
T1
+
C1
+
U1
PWM
GND
VOUT
VIN


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