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LM2586S-3.3 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM2586S-3.3 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 30 page Flyback Regulator Operation The LM2586 is ideally suited for use in the flyback regulator topology. The flyback regulator can produce a single output voltage, such as the one shown in Figure 4, or multiple output voltages. In Figure 4, the flyback regulator generates an output voltage that is inside the range of the input voltage. This feature is unique to flyback regulators and cannot be duplicated with buck or boost regulators. The operation of a flyback regulator is as follows (refer to Figure 4): when the switch is on, current flows through the primary winding of the transformer, T1, storing energy in the magnetic field of the transformer. Note that the primary and secondary windings are out of phase, so no current flows through the secondary when current flows through the pri- mary. When the switch turns off, the magnetic field col- lapses, reversing the voltage polarity of the primary and secondary windings. Now rectifier D1 is forward biased and current flows through it, releasing the energy stored in the transformer. This produces voltage at the output. The output voltage is controlled by modulating the peak switch current. This is done by feeding back a portion of the output voltage to the error amp, which amplifies the differ- ence between the feedback voltage and a 1.230V reference. The error amp output voltage is compared to a ramp voltage proportional to the switch current (i.e., inductor current dur- ing the switch on time). The comparator terminates the switch on time when the two voltages are equal, thereby controlling the peak switch current to maintain a constant output voltage. Block Diagram 01251623 For Fixed Versions 3.3V, R1 = 3.4k, R2 = 2k 5.0V, R1 = 6.15k, R2 = 2k 12V, R1 = 8.73k, R2 = 1k For Adj. Version R1 = Short (0 Ω), R2 = Open FIGURE 3. Block Diagram www.national.com 11 |
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