MP023 Primary Side CC/CV Flyback Controller SOIC8

MP023 Primary Side CC/CV Flyback Controller SOIC8

The MP023 is an offline, primary-side controller that provides accurate, constant voltage and constant current regulation without the need of an optocoupler or secondary feedback circuit.

Key Specifications

Features

• Primary-Side Control without Optocoupler or Secondary Feedback Circuit
• Precise Constant Current and Constant Voltage Control (CC/CV)
• Variable Off-Time Peak Current Control
• 700V High-Voltage Current Source
• 20mW No-Load Power Consumption
• Programmable Cable Compensation
• Programmable Current Limit and Maximum Secondary Duty Cycle
• Programmable FB Voltage Sensing Point
• Multiple Protection Features: OVP, OCkP, OLP, OTP, VCC UVLO
• Low Cost and Simple External Circuit

Typical Application Circuit

Applications

• Appliance Power Supplies
• Adapters for Handheld Electronics

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