MP020-5 Primary-Side Regulator SOIC8

MP020-5 Primary-Side Regulator SOIC8

The MP020-5 is an offline, primary-side regulator that provides accurate constant voltage and constant current regulation without an opto-coupler or a secondary feedback circuit.

Key Specifications

Features

• Primary-Side–Control without Opto-Coupler or Secondary Feedback Circuit
• Precise Constant Current and Constant Voltage Control (CC/CV)
• Integrated 700V MOSFET with Minimal External Components
• Variable, Off-Time, Peak-Current Control
• 550µA High-Voltage Current Source
• 30mW No-Load Power Consumption
• Programmable Cable Compensation
• Multiple Protections: OVP, OCP, OCkP, OTP, and VCC UVLO
• Natural Spectrum Shaping for Improved EMI Signature
• Low Cost and Simple External circuit

Typical Application Circuit

Applications

• Cell Phone Chargers
• Adapters for Handheld Electronics
• Stand-By and Auxiliary Power Supplies

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