The EVMP45000-M-00A evaluation board is designed to demonstrate the capabilities of MPS's MP45000. The MP45000 is a critical conduction mode (CrM) totem-pole power factor correction (PFC) controller, configurable via the UART interface. The bridgeless totem-pole PFC typology eliminates the diode bridge in conventional PFC circuit, allowing significant improvement in efficiency and power density. The MP45000’s power-saving technology helps the power supply design to achieve optimized efficiency across the entire operating range.

The MP45000 employs a digital constant-on-time (COT) control scheme to achieve hybrid CrM and discontinuous conduction mode (DCM) operation. Under light loads, the switching frequency (f_SW) can be reduced to achieve better efficiency. Higher power factor (PF) is also achieved at light loads via improved digital input capacitor current compensation.

In addition, it features continuous conduction mode (CCM) operation to reduce inductance for designs that have a peak power requirement. With the help of patented CCM control logic, the MP45000 can operate in CCM briefly to support high output power (P_OUT) demands. It integrates two high-side MOSFET (HS-FET) drivers and two low-side MOSFET (LS-FET) drivers, which help simplify the peripheral circuit design. The fast-switching bridge driver has a separate Kelvin ground pin designed for GaN HEMTs. Different source and sink pins allow the MP45000 to adjust the turn-on and turn-off speeds easily with high reliability.

Robust protection features enhance system safety and reliability. The MP45000 features over-voltage protection (OVP), over-current limiting (OCL), under-voltage protection (UVP), brown-in (BI) and brown-out (BO) protection, VCC voltage (V_CC) under-voltage lockout (UVLO), and over-temperature protection (OTP). Adaptive dead-time adjustment (ADTA) is used to minimize switching losses and increase the efficiency.

The MP45000 is available in a TSSOP-28 package.