MPX2002

The MPX2002 is an all-in-one flyback controller with an integrated primary driving circuit, secondary controller, synchronous rectification driver, and safety compliance feedback. The device provides the benefits of both primary-side regulation (PSR) and secondary-side regulation (SSR).

Without the need for a feedback circuit, the system is simplified, and the total BOM cost is reduced. The synchronous rectifier (SR) can match the driving signal of the primary-side MOSFET, which allows the SR to safely operate in continuous conduction mode (CCM). The integrated SR controller regulates the SR MOSFET at a low threshold to increase overall efficiency while providing a more flexible design.

An integrated, internal linear regulator provides the SR power supply, so the MPX2002 can drive the low-side SR MOSFET without auxiliary winding, even when the output is insufficient.

The MPX2002 can run in CCM under heavy loads, then switch to Quasi-Resonant (QR) operation when the load decreases. If the load drops further, the MPX2002 works in pulse-frequency modulation (PFM) mode. The switching frequency is fixed at 20kHz when it enters burst mode, which reduces audible noise. With this feature, the MPX2002 can achieve high efficiency under all load conditions with excellent electromagnetic interference (EMI) performance.

The MPX2002 features advanced protections, including VCC over-voltage protection (OVP), primary over-current protection (POCP), secondary-sense output overload protection (OLP), internal brown-in (B/I) and brownout (B/O), short-circuit protection (SCP), current-sense short protection (SSP), 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 MPX2002 is available in SOICW-16 and SOICW-16-T packages.