ICL5101_16 Datasheet, PDF (17/44 Pages) Infineon Technologies AG – Resonant controller IC with PFC for LED driver

ICL5101
Functional Description
2.2.5
Self-Adapting Dead Time during Gate Drive Activity between HS and LS
The dead time between the turn OFF and turn ON of the RESONANT drivers is self-adapting and is detected by
means of switch-off of the high-side MOSFET and the –50 mV threshold of the LSCS voltage (see Figure 11).
The typical range of the dead time adjustment is 500 ns up to 1.0 µs during all operating modes. The start of the
dead time measurement is the OFF switching of the high-side MOSFET. The dead time measurement finishes
when V_LSCS drops below -50 mV for longer than typically 300 ns (internal fixed propagation delay). This time will
be stored, the low-side gate driver switches ON. The high-side gate driver turns ON again after OFF switching
of the low-side switch and the stored dead time (see copied dead time in Figure 11).
Normal Operation in RUN Mode
V_DSLS
VLSCS = -50mV
Gate LS
V_LSCS
END of Dead Time
Measurement
Gate HS
START of Dead Time
Measurement
Dead Time
300 ns
Propagation Delay
Dead Time
Stored Dead Time
Copied Dead Time
Figure 11 Dead Time ON and OFF of the Inverter Gate Drivers
Datasheet
17
Rev. 1.3, 2016-01-15