MPX2003GYT Datasheet | Monolithic Power Systems

MPX2003 Up to 140k Hz All-in-One Flyback Controller with Integrated Primary Control Circuitry and Secondary Synchronous Rectification Driver DESCRIPTION The MPX2003 is an all-in-one flyback controller with an integrated primary driving circuit, secondary controller, synchronous rectification driver, and safety-pliant feedback. It offers the benefits of both primary-side regulation (PSR) and secondary-side regulation (SSR). A feedback circuit is not required, which reduces system plexity and the total BOM cost. The synchronous rectifier (SR) can match the driving signal of the primary-side MOSFET, meaning the SR can operate safely in continuous conduction mode (CCM). Meanwhile, the integrated SR controller regulates the SR MOSFET at a low threshold, which increases the overall efficiency and design flexibility. An internal linear regulator is integrated for the SR power supply, so the MPX2003 can drive the low-side SR MOSFET without auxiliary winding, even when the output is low. The MPX2003 can run in CCM under heavy loads, then operate in quasi-resonant (QR) mode when the load decreases. If the load drops further, the MPX2003 works in pulse-frequency modulation (PFM) mode. The switching frequency (f SW) is fixed at 20k Hz when the device enters burst mode, which can prevent audible noise. The MPX2003 achieves high efficiency under most load conditions while improving electromagnetic interference (EMI) performance. The MPX2003 Features advanced protections, including VCC over-voltage protection (OVP), primary over-current protection (POCP), secondary-sense output overload protection (OLP), internal brown-in/brownout (B/I, B/O), short-circuit protection (SCP), current-sense short protection (SSP), current-sense open protection (SOP), SR gate open/short protection (SGOP/SGSP), SRD abnormal protection (SRDP), FB OVP and under-voltage protection (UVP), internal thermal shutdown, under-voltage lockout (UVLO), and an externally triggered protection (Ext.P). The...