The HR1210 is a Multi-Mode PFC and Current Mode LLC Combo Controller, programmable through UART Interface. The power saving technology of HR1210 helps the power supply design to achieve optimized efficiency all over the operating range.
The PFC controller in HR1210 employs patented digital average current control scheme to achieve hybrid CCM and DCM operation. The switching frequency at light load can be reduced due to DCM which lead to better efficiency. Higher Power Factor (PF) is also achieved at light load in HR1210 by digital input capacitor current compensation method. At heavy load, CCM operation reduces the peak current in MOSFET which makes the controller can be implemented in wider load range.
HR1210 implements current mode control in the LLC stage, so it can easily achieve good stability and fast response at the same time. In addition, three different operation modes are implemented based on the different load conditions, i.e. steady state mode, skip mode and burst mode. In this way, efficiency in different load conditions can be optimized independently. The key zero-voltage switching (ZVS) feature of LLC converter that benefit the efficiency performance the most, can be always guaranteed by the adaptive dead time of both high-side gate and low-side gate driver. And also, any capacitive operation is effectively prevented in HR1210.
HR1210 integrates a high voltage current source internal the IC for startup. Therefore, the traditional start up resistor or external circuit can be removed. The high voltage current source is also implemented as X-cap discharger when AC input is dropout, so that the resistor for X-cap discharge can be removed too.
HR1210 features variable protections to make the system safe in case of any system faults. Such as thermal Shutdown (TSD), PFC Open Loop Protection (OLP), Over voltage Protection (OVP), Over Current Limit (OCL) and LLC Short Circuit Protection (SCP), SO pin protection, Over Load Protection (OLP).
HR1210 is available in SOIC20 and TSSOP20.
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