L6699D

The L6699D is a double-ended enhanced high voltage Resonant Controller specific to series-resonant half bridge topology. Both LLC and LCC configurations are supported. It provides symmetrical complementary duty cycle: the high-side switch and the low-side switch are driven ON/OFF 180° out-of phase for exactly the same time. Output voltage regulation is obtained by modulating the operating frequency. The dead-time inserted between the turn-OFF of one switch and the turn-ON of the other one is automatically adjusted to best fit the transition times of the half bridge midpoint. To drive the high-side switch with the bootstrap approach, the IC incorporates a high voltage floating structure able to withstand more than 600V with a synchronous-driven high voltage DMOS that replaces the external fast-recovery bootstrap diode. The IC enables the user to set the operating frequency range of the converter by means of a high-accuracy externally programmable oscillator.

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