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AN4501 Datasheet(PDF) 5 Page - STMicroelectronics |
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AN4501 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 48 page DocID026394 Rev 1 5/48 AN4501 List of figures 5 List of figures Figure 1. Circuit schematics in boost configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 2. Application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 3. Evolution of IL, IL,PEAK, IL,PP with VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 4. Typical waveforms of a boost converter in continuous current mode . . . . . . . . . . . . . . . . . 14 Figure 5. Converter switching frequency versus RSF value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 6. Inductor waveforms of a boost converter in CCM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 7. Inductor current flow during the converter on-time and off-time . . . . . . . . . . . . . . . . . . . . . 19 Figure 8. A shunt resistor is used to monitor the inductor current during the on-state. . . . . . . . . . . . 22 Figure 9. Inductor current at the boundary between CCM and DCM. . . . . . . . . . . . . . . . . . . . . . . . . 23 Figure 10. Typical waveforms of the freewheeling diode in CCM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Figure 11. Feedback resistors for output over-voltage detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Figure 12. Typical current waveforms of the output capacitor current . . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 13. Current waveforms of the inductor and of the input capacitor for a boost converter in CCM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 14. Current waveforms of the input capacitor for a boost converter in CCM . . . . . . . . . . . . . . 31 Figure 15. Typical current waveform of M1 in CCM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Figure 16. Waveforms during the switch-on of M1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 17. Waveforms during the switch off of M1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Figure 18. Flowchart for the iterative calculation of the junction temperature of M1 . . . . . . . . . . . . . . 38 Figure 19. Inductor voltage during the on-phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Figure 20. Inductor voltage during the off-phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Figure 21. Typical inductor waveforms in continuous conduction mode . . . . . . . . . . . . . . . . . . . . . . . 42 Figure 22. Typical current waveform of M1 in CCM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Figure 23. Typical current waveform of the freewheeling diode in CCM . . . . . . . . . . . . . . . . . . . . . . . 44 |
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