High voltage LLC resonant controller chip

It is a dual ended controller designed specifically for resonant half bridge topology structures. Provide a 50% complementary duty cycle, with the high side switch and low side switch having the same time and a phase difference of 180 °. Adjust the output voltage by modulating the operating frequency. A fixed dead time ensures soft switching and high-frequency operation, an external oscillator can set the operating frequency of the converter, and an internal bootstrap diode is included. At startup, the switching frequency gradually decreases from its maximum value and reaches a steady-state value determined by the control circuit. IC can be forced to enter controlled burst mode operation under light load to keep the input power consumption of the converter to a minimum. The functions include effective low level disable input without latch, current hysteresis and undervoltage protection, current detection input, frequency automatic restart, switching and delayed shutdown, etc. The two-stage OCP can provide a complete overload and short circuit protection circuit, and the additional latch disable input (DIS) is easy to implement OTP or OVP. It provides an interface with the PFC controller and can be turned off in case of fault or operated during burst mode

Integrated 600V High Voltage Drive LLC Resonant Controller

It is a high-performance controller applied in half bridge topology, such as series resonance, parallel resonance, and LLC resonance controllers. It integrates a 650V half bridge driver with fewer peripheral components, simplifying the layout. Adopting a unique architecture, including a maximum 500kHz voltage controlled oscillator with flexible control modes, it can achieve reliable and stable resonant mode power supply. It has complete protection functions and can be configured to apply to a wider range of applications, including overcurrent protection self recovery, undervoltage protection, soft start, optocoupler open circuit and short circuit protection functions. It can also be configured with dead time to prevent the upper and lower bridge MOSFETs from conducting simultaneously, suitable for different power occasions