The HR1001B is a noise-proofed, enhanced version of the HR1001, and it is pin-to-pin and BOM-to-BOM with the HR1001. The HR1001B is an enhanced LLC controller, which provides new adaptive dead-time adjustment (ADTA) and capacitive mode protection (CMP) features.
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. The HR1001B 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 HR1001B 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 HR1001B enters a controlled burst mode at light-load to minimize the power consumption and tighten output regulation.
The HR1001B provides rich protection features, including two-level OCP with external latch shutdown, auto-recovery, brown-in/out, CMP, and OTP, improving converter design safety with minimal external components.