MP44019 CrM/DCM Multi-Mode PFC Controller SOIC

MP44019 CrM/DCM Multi-Mode PFC Controller SOIC

The MP44019 is a CrM/DCM multi-mode PFC controller that provides simple and high- performance active power factor correction using minimal external components.

Key Specifications

Features

• Valley Turn On for Minimum Switching Loss
• Frequency Reduction to Reduce Switching Loss Under Light-Load Conditions
• Low Supply Current in Burst Mode
• Soft-On/Off Burst for Low Audible Noise
• Mains Compensation
• Improved THD
• Under-Voltage Protection (UVP)
• Over-Current Limit (OCL)
• Over-Current Protection (OCP)
• Over-Voltage Protection (OVP)

Typical Application Circuit

Applications

• LCD and OLED TVs
• Desktop PCs and Servers
• High-Power Supplies for Lighting
• AC/DC Adapters, Open-Frame SMPSs

Design Notes

• The PFC inductor must support the maximum duty cycle at the lowest line voltage, which is where saturation risk peaks.
• High-voltage startup and X-capacitor discharge paths dominate no-load standby loss; verify them against the efficiency target.
• Leakage inductance and the RCD clamp set the turn-off loss — snubber values are a thermal trade-off, not a fixed recipe.
• Synchronous rectification timing must track the primary switching; a mistimed SR FET conducts through its body diode and fails hot.

Common Questions