The HR1001L is an enhanced LLC controller that provides new, adaptive dead-time adjustment (ADTA) and capacitive mode protection (CMP) features. The HR1001L is the OCP latch-off version of the HR1001B.
ADTA inserts a dead time between the two complimentary gate outputs automatically by keeping the outputs off while sensing the dV/dt current of the half-bridge switching node. ADTA features easier design, lower EMI, and higher efficiency. The HR1001L incorporates anti-capacitive mode protection, which prevents potentially destructive capacitive mode switching if the output is shorted or has a severe overload. This feature protects the MOSFET during abnormal conditions, making the converter robust.
The device 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. The HR1001L enters controlled burst mode at light-load to minimize the power consumption and tighten output regulation.
Full protection features include two-level over-current protection (OCP), external-latch shutdown, brown-in/brown-out, capacitive mode protection (CMP), and over-temperature protection (OTP).