Enhanced LLC Controller with Robust Adaptive Dead-Time Adjustment and Capacitive Mode Protection
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The HR1002A is an enhanced LLC controller that provides robust adaptive dead-time adjustment (ADTA) and capacitive mode protection (CMP), as well as improved functional surge performance.
ADTA 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. ADTA simplifies the design and provides lower EMI, as well as higher efficiency.
The HR1002A incorporates capacitive mode protection, which prevents potentially destructive capacitive mode switching if the output is shorted or is severely overloaded. This feature protects the MOSFET during abnormal conditions to provide a robust converter.
The HR1002A has a configurable oscillator that sets both the maximum and minimum switching frequencies. To prevent excessive inrush current, it starts up at a configured maximum switching frequency and decays until the control loop takes over.
The HR1002A enters a controlled burst mode under light-load conditions to minimize power consumption and tighten the output regulation.
Full protection features include two-level over-current protection (OCP) with external latched shutdown, auto-recovery, brown-in and brownout, capacitive mode protection (CMP), and over-temperature protection (OTP).
The HR1002A requires minimal external components, and is available in an SOIC16-15 package.
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