L6699

List of figures

Doc ID 022835 Rev 2

3/38

List of figures

Figure 1.

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2.

Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3.

Typical system block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 4.

Multimode operation of the L6699 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 5.

Oscillator's internal block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 6.

Oscillator waveforms and their relationship with gate-driving signals. . . . . . . . . . . . . . . . . 14

Figure 7.

Adaptive deadtime: principle schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 8.

Relevant timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 9.

Detailed view of deadtime during low-to-high transition of half bridge midpoint . . . . . . . . . 16

Figure 10.

Comparison startup behavior: traditional controller (left), with L6699 (right) . . . . . . . . . . . 18

Figure 11.

Comparison of initial cycles after startup: traditional controller (left), with L6699 (right). . . 19

Figure 12.

Soft-start circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 13.

Input impedance vs. frequency curve in an LLC resonant half bridge . . . . . . . . . . . . . . . . 20

Figure 14.

Narrow input voltage range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 15.

Wide input voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 16.

Load-dependent operating modes: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 17.

How the L6699 can switch off a PFC controller at light load . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 18.

Current sensing techniques with sense resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 19.

Current sensing techniques “lossless”, with capacitive shunt. . . . . . . . . . . . . . . . . . . . . . . 24

Figure 20.

Soft-start and delayed shutdown upon overcurrent timing diagram

(safe-start details are not shown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 21.

Details of hard-switching transition during capacitive-mode operation . . . . . . . . . . . . . . . . 28

Figure 22.

Line sensing function: internal block diagram and timing diagram . . . . . . . . . . . . . . . . . . . 31

Figure 23.

Bootstrap supply: standard circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 24.

Bootstrap supply: internal bootstrap synchronous diode . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 25.

SO16N dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 26.

Package drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 27.

Recommended footprint (dimensions are in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36