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L6566A 数据表(PDF) 5 Page - STMicroelectronics |
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L6566A 数据表(HTML) 5 Page - STMicroelectronics |
5 / 51 page L6566A List of figures 5/51 List of figures Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 2. Typical system block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 3. Pin connection (through top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 4. Multi-mode operation with QR option active . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 5. High-voltage start-up generator: internal schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 6. Timing diagram: normal power-up and power-down sequences . . . . . . . . . . . . . . . . . . . . 19 Figure 7. Timing diagram showing short-circuit behavior (SS pin clamped at 5V). . . . . . . . . . . . . . . 20 Figure 8. Zero current detection block, triggering block, oscillator block and related logic . . . . . . . . 20 Figure 9. Drain ringing cycle skipping as the load is gradually reduced . . . . . . . . . . . . . . . . . . . . . . 21 Figure 10. Operation of ZCD, triggering and Oscillator blocks (QR option active). . . . . . . . . . . . . . . . 23 Figure 11. Load-dependent operating modes: timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 12. Addition of an offset to the current sense lowers the burst-mode operation threshold . . . . 25 Figure 13. Adaptive UVLO block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Figure 14. Possible feedback configurations that can be used with the L6566A . . . . . . . . . . . . . . . . . 26 Figure 15. Externally controlled burst-mode operation by driving pin COMP: timing diagram. . . . . . . 27 Figure 16. Typical power capability change vs input voltage in QR flyback converters . . . . . . . . . . . 28 Figure 17. Left: Overcurrent setpoint vs. VFF voltage; right: Line Feedforward function block . . . . . . 29 Figure 18. Hiccup-mode OCP: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Figure 19. Possible interfaces between the L6566A and a PFC controller . . . . . . . . . . . . . . . . . . . . . 32 Figure 20. Operation after latched disable activation: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . 33 Figure 21. Soft-start pin operation under different operating conditions and settings . . . . . . . . . . . . . 34 Figure 22. OVP Function: internal block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 23. OVP function: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Figure 24. Maximum allowed duty cycle vs. switching frequency for correct OVP detection. . . . . . . . 37 Figure 25. Brownout protection: internal block diagram and timing diagram . . . . . . . . . . . . . . . . . . . . 38 Figure 26. Ac voltage sensing with the L6566A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Figure 27. Slope compensation waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Figure 28. Typical low-cost application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Figure 29. Typical full-feature application schematic (QR operation) . . . . . . . . . . . . . . . . . . . . . . . . . 44 Figure 30. Typical full-feature application schematic (FF operation) . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Figure 31. Frequency foldback at light load (FF operation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Figure 32. Latched shutdown upon mains overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 |
类似零件编号 - L6566A |
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类似说明 - L6566A |
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