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AN3276 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN3276 Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 22 page  AN3276 The new ST solution - BC2: energy recovery circuit Doc ID 17975 Rev 1 11/22 This feature requires a specific diode for this application, so ST has developed an optimized diode with an accurate trade-off between the IRM current value and its breakdown voltage. 2.2.4 Phase t2 to t3 Figure 11. Equivalent circuit t2 to t3 At t2, the current in D1 reaches 0 A and then the BC 2 works as a conventional power boost converter. As the power transistor stays on, the current in the main LB and the small L inductor increases up to I1 at time t3. 2.2.5 Phase t3 to t4 Figure 12. Equivalent circuit t3 to t4 At t3, the power transistor turns off. At this time the voltage across the MOSFET increases linearly as its COSS capacitance is charged by the current stored in the small inductor L to reach conduction in diode D2. No overvoltage stress occurs on the power switch during the turn off. At the same time, the voltage polarity across the main inductor changes until it reaches DB diode conduction. As soon as the diodes conduct together, the output current is shared as shown in Figure 7. The current in D2 starting at I1, decreases due to the reflected voltage from NS2 to reach 0 A with a low dI/dt. On the other hand, the current in DB rises to reach the nominal current at t4. This shared current is a benefit for the BC 2 circuit. In the PFC application working under a lower mains voltage such as 90 V rms, the highest L DB D2 D1 V V mains NS2 NS1 I1 V OUT TR + - - + Cj Coss L DB D2 D1 V V mains NS2 NS1 I1 V OUT + - - + |
Similar Part No. - AN3276 |
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Similar Description - AN3276 |
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