The L6699 is a double-ended 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 deadtime 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 600 V 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. At startup, in addition to the traditional frequency-shift soft-start (the switching frequency starts from a preset maximum value and then decays as far as the steady-state value determined by the control loop), a proprietary circuit controls the half bridge to prevent hard-switching from occurring in the initial cycles because of the unbalance in the V·s applied to the transformer. At light load the IC can be forced to enter a controlled burst-mode operation that keeps the converter input consumption as low as possible. IC protection functions include a current sense input for OCP with frequency shift and delayed shutdown with automatic restart. Fast shutdown with automatic restart occurs if this first-level protection cannot control the primary current. Additionally, the IC prevents the converter from working in or too close to the capacitive mode, to guarantee soft-switching. A latched disable input (DIS) can be used to implement OTP and/or OVP. The combination of these protection features offers the highest degree of safety. Other functions include a not-latched active-low disable input with current hysteresis, useful for power sequencing or for brownout protection, and an interface with the PFC controller that enables the switching-off of the pre-regulator during fault conditions or during burst-mode operation. https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2020-06-12 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2021-04-03 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2021-04-15 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2021-07-17 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2021-10-02 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2021-12-04 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2022-04-07 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2022-06-13 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2022-06-25 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2023-03-23 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2023-10-18 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-01-08 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-02-02 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-02-11 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-03-11 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-03-20 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-05-20 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-08-07 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-09-12 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-10-07 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2024-11-02 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2025-06-16 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2025-07-04 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2025-09-16 https://elecena.pl/product/16964353/l6699d-enhanced-high-voltage-resonant-controller 2025-11-27