Datasheet
Table Of Contents
- Figure 1. Block diagram
- 1 Description
- 2 Maximum ratings
- 3 Pin connection
- 4 Electrical characteristics
- 5 Typical electrical performance
- Figure 3. IC consumption vs. VCC
- Figure 4. IC consumption vs. TJ
- Figure 5. VCC Zener voltage vs. TJ
- Figure 6. Startup and UVLO vs. TJ
- Figure 7. Feedback reference vs. TJ
- Figure 8. E/A output clamp levels vs. TJ
- Figure 9. UVLO saturation vs. TJ
- Figure 10. OVP levels vs. TJ
- Figure 11. Inductor saturation threshold vs. TJ
- Figure 12. Vcs clamp vs. TJ
- Figure 13. ZCD sink/source capability vs. TJ
- Figure 14. ZCD clamp level vs. TJ
- Figure 15. R discharge vs. TJ
- Figure 16. Line drop detection threshold vs. TJ
- Figure 17. VMULTpk - VVFF dropout vs. TJ
- Figure 18. PFC_OK threshold vs. TJ
- Figure 19. PFC_OK FFD threshold vs. TJ
- Figure 20. Multiplier characteristics at VFF = 1 V
- Figure 21. Multiplier characteristics at VFF = 3 V
- Figure 22. Multiplier gain vs. TJ
- Figure 23. Gate drive clamp vs. TJ
- Figure 24. Gate drive output saturation vs. TJ
- Figure 25. Delay to output vs. TJ
- Figure 26. Start-up timer period vs. TJ
- 6 Application information
- 7 Application examples and ideas
- Figure 34. Demonstration board EVL6564-100W, wide-range mains: electrical schematic
- Figure 35. L6564 100W TM PFC: compliance to EN61000-3-2 standard
- Figure 36. L6564 100W TM PFC: compliance to JEITA-MITI standard
- Figure 37. L6564 100 W TM PFC: input current waveform at 230 - 50 Hz - 100 W load
- Figure 38. L6564 100W TM PFC: input current waveform at 100 V - 50 Hz - 100 W load
- 8 Package mechanical data
- 9 Order codes
- 10 Revision history
Application information L6564
24/33 DocID16202 Rev 5
However, in some applications such as ac-dc adapters, where the PFC preregulator is
turned off at light load for energy saving reasons, even a well-designed boost inductor may
occasionally slightly saturate when the PFC stage is restarted because of a larger load
demand. This happens when the restart occurs at an unfavorable line voltage phase, i.e.
when the output voltage is significantly below the rectified peak voltage. As a result, in the
boost inductor the inrush current coming from the bridge rectifier adds up to the switched
current and, furthermore, there is little or no voltage available for demagnetization.
To cope with a saturated inductor, the L6564 device is provided with a second comparator
on the current sense pin (CS, pin 4) that stops the IC if the voltage, normally limited within
1.1 V, exceeds 1.7 V. After that, the IC will be attempted to restart by the internal starter
circuitry; the starter repetition time is twice the nominal value to guarantee lower stress for
the inductor and boost diode. Hence, the system safety will be considerably increased.
Figure 32. Effect of boost inductor saturation on the MOSFET current and detection method