Datasheet
AN4164 List of figures
Doc ID 023660 Rev 1 5/38
List of figures
Figure 1. Demonstration board image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. V
DD
waveforms IC externally biased (J1 selected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. V
DD
waveforms IC self-biased (J1 not selected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. Transformer, pin distances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6. Transformer, electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7. Transformer side view 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 8. Transformer side view 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 9. Drain current/voltage at 115 V
ac
, max. load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 10. Drain current/voltage at 230 V
ac
, max. load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 11. Drain current/voltage at 90 V
ac
, max. load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 12. Drain current/voltage at 265 V
ac
, max. load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 13. Line regulation, IC externally biased (J1 selected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 14. Line regulation, IC self-biased (J1 not selected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 15. Load regulation, IC externally biased (J1 selected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 16. Load regulation, IC self-biased (J1 not selected). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 17. Output voltage ripple at 115 V
AC
no load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 18. Output voltage ripple at 230 V
AC
no load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 19. Output voltage ripple at 115 V
AC
25 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 20. Output voltage ripple at 230 V
AC
25 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 21. Active mode efficiency of the demonstration board and comparison
with energy efficiency standards (IC externally biased) . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 22. P
IN
vs. V
IN
at no load and light load; IC externally biased (J1 selected) . . . . . . . . . . . . . . 17
Figure 23. P
IN
vs. V
IN
at no load and light load, IC self-biased (J1 not selected) . . . . . . . . . . . . . . . . 17
Figure 24. Efficiency at P
IN
= 1 W; IC externally biased (J1 selected) . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 25. Efficiency at P
IN
= 1 W; IC self biased (J1 not selected) . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 26. P
IN
at P
OUT
= 250 mW; IC externally biased (J1 selected) . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 27. P
IN
at P
OUT
= 250 mW; IC self biased (J1 not selected) . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 28. Soft-start @ startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 29. Soft-start @ startup (zoom) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 30. OLP short-circuit applied: OLP tripping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 31. Output short-circuit maintained: OLP steady-state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 32. Output short-circuit maintained: OLP steady-state (zoom) . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 33. Output short-circuit removal and converter restart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 34. Feedback loop failure protection: tripping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 35. Feedback loop failure protection: steady-state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 36. Feedback loop failure protection: steady-state, zoom . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 37. Feedback loop failure protection: converter restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 38. Control loop block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 39. Thermal measurement at V
IN
= 90 V
AC
, full load, IC externally biased . . . . . . . . . . . . . . . 26
Figure 40. Thermal measurement at V
IN
= 115 V
AC
, full load, IC externally biased . . . . . . . . . . . . . . 26
Figure 41. Thermal measurement at V
IN
= 230 V
AC
, full load, IC externally biased . . . . . . . . . . . . . . 27
Figure 42. Thermal measurement at V
IN
= 265 V
AC
, full load, IC externally biased . . . . . . . . . . . . . . 27
Figure 43. Thermal measurement at V
IN
= 90 V
AC
, Iout = 310 mA, IC self biased . . . . . . . . . . . . . . . 27
Figure 44. Thermal measurement at V
IN
= 115 V
AC
, Iout = 310 mA, IC self biased . . . . . . . . . . . . . . 28
Figure 45. Thermal measurement at V
IN
= 230 V
AC
, full load, IC self biased . . . . . . . . . . . . . . . . . . . 28
Figure 46. Thermal measurement at V
IN
= 265 V
AC
, full load, IC self biased . . . . . . . . . . . . . . . . . . . 28
Figure 47. Average measurements at full load, T
AMB
=25 ×C, 115 V
AC
, IC externally biased . . . . . . 29