The HR1001 is an enhanced LLC controller which provides new features of adaptive dead time adjustment (ADTA) and capacitive mode protection (CMP). The adaptive dead time adjustment automatically inserts a dead time between the two complimentary gate outputs. This is ensured by keeping the outputs off while sensing the dv/dt current of the half-bridge switching node. The ADTA features easier design, lower EMI, and higher efficiency. HR1001 incorporates anti-capacitive mode protection which prevents potentially destructive capacitive mode switching if the output is shorted or has a severe over load. This feature protects the MOSFET during abnormal condition, making the converter robust. HR1001 has a programmable oscillator that sets both the maximum and minimum switching frequencies. It starts up at a programmed maximum switching frequency and decays until the control loop takes over to prevent excessive inrush current. HR1001 enters a controlled burst-mode operation at light-load to minimize the power consumption and tighten output regulation. HR1001 provides rich protection features which include two-level OCP with external latch shutdown, auto-recovery, brown in/out, CMP, and OTP, improving converter design safety with minimal extra components.
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