AN2393

List of figures

3/35

List of figures

Figure 1.

L6599 and L6563 200W evaluation board (EVAL6599-200W). . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2.

PFC pre-regulator electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3.

Resonant converter electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4.

Auxiliary converter electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 5.

Overall efficiency versus output power at nominal mains voltages. . . . . . . . . . . . . . . . . . . 10

Figure 6.

Overall efficiency versus output power at several input voltage values . . . . . . . . . . . . . . . 11

Figure 7.

Resonant circuit primary side waveforms at full load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 8.

Resonant circuit primary side waveforms at no-load condition. . . . . . . . . . . . . . . . . . . . . . 12

Figure 9.

Resonant circuit secondary side waveforms: +24 V output . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 10.

Resonant circuit secondary side waveforms: +12 V output . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 11.

Low frequency (100 Hz) ripple voltage on the output voltages . . . . . . . . . . . . . . . . . . . . . . 13

Figure 12.

Load transition (0 - 100%) on +24 V output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 13.

Load transition (0 - 100%) on +12 V output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 14.

+24 V output short-circuit waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 15.

+12 V output short-circuit waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 16.

Thermal map @115 Vac - full load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 17.

Figure 18.

Figure 19.

Figure 20.

PFC coil electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 21.

PFC coil pin side view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 22.

Mechanical aspect and pin numbering of resonant transformer . . . . . . . . . . . . . . . . . . . . . 28

Figure 23.

Resonant transformer electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 24.

Resonant transformer winding position on coil former . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 25.

Auxiliary transformer electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 26.

Auxiliary transformer winding position on coil former . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 27.

Copper tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 28.

Thru-hole component placing and top silk screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 29.

SMT component placing and bottom silk screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33