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SC4809B Datasheet(PDF) 8 Page - Semtech Corporation |
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SC4809B Datasheet(HTML) 8 Page - Semtech Corporation |
8 / 16 page 8 2005 Semtech Corp. www.semtech.com SC4809A/B/C POWER MANAGEMENT Application Information The flyback power stage is very popular in 48V input telecom applications for output power levels up to approximately 50 watts. The exact power rating of the flyback power stage, of course, is dependent on the input voltage/output voltage combination, its operating environment and many other factors. Additional output voltages can be generated easily by simply adding another winding to the coupled inductor along with an output diode and output capacitor. Obtaining multiple output voltages from a single power stage is another advantage of the flyback power stage. A simplified schematic of the flyback power stage with a drive circuit block included is shown in Figure 1. In the schematic shown, the secondary winding of the coupled inductor is connected to produce output voltage. The power switch, Q1, is an N-channel MOSFET. The secondary inductance, L SEC and capacitor C, make up the output filter, The resistor R, represents the load seen by the power supply output. Figure 1: Flyback Power Converter The important waveforms of the flyback power stage operating in DCM are shown in Figure 2. Figure 2: Discontinuous Mode Flyback Waveforms The simplified voltage conversion relationship for the flyback power stage operating in CCM is given by: D 1 D N N V V P S I O − • • = The simplified voltage conversion relationship for the flyback power stage operating in DCM is given by: K D N N V V P S I O • • = Where K is defined as: S SEC T R L 2 K • • = |
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