14 November 2018
Power Electronics / Power Management
Monolithic Power Systems’ HR1200 is a high-performance controller that integrates an advanced digital PFC (power factor correction) controller and a half-bridge LLC resonant controller. It requires fairly low input power at no load or ultra-light load, making it compliant with certain Energy using Product directive (EuP) specifications.
The PFC of the HR1200 employs a patented average current control scheme, which can operate both in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) according to the instantaneous condition of the input voltage and output load. The IC exhibits high efficiency and high power factor at light load.
In CCM, the HR1200 can be used in applications up to 500 W with minimal board size limitations. The performance of the PFC can be optimised by programming multiple parameters through an I²C GUI. Programming can be completed either by the factory or by the customer referring to a detailed user guide.
The half-bridge LLC resonant converter achieves high efficiency with zero-voltage switching (ZVS). The HR1200 implements an adaptive dead-time adjustment (ADTA) function to guarantee ZVS in different load conditions. Additionally, it can prevent the LLC converter from operating in capacitive mode, making it more robust and easier to design.
The chip integrates a high-voltage (HV) current source internally for start-up. When the AC input is removed, the HV current source also functions as an X-cap discharger. Such features are helpful to reduce related devices, thus reducing power consumption at no load.
The HR1200 has multiple protection features including thermal shutdown (TSD), open-loop protection (OLP), over-current protection (OCP), over-voltage protection (OVP) and brown-in/brown-out protection.
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