MP4021A NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP4026 & MP4027 MP4021A SOIC8

MP4021A NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP4026 & MP4027 MP4021A SOIC8

The MP4021A is a primary-side–control offline LED lighting controller that achieves high power factor and accurate LED current for isolated single-power-stage lighting applications in a single SOIC8 package.

Key Specifications

Features

• Real current control without secondary- feedback circuit
• Typical ±1.5% load regulation
• Unique architecture for superior line regulation
• High power factor≥0.9 over universal input voltage
• Boundary conduction mode improves efficiency
• Ultra-low (20µA) start-up current
• Low (1mA) quiescent current
• Input UVLO
• Cycle-by-cycle current limit
• Over-voltage protection

Typical Application Circuit

Applications

• Solid-state lighting
• Industrial and commercial lighting

Design Notes

• Channel-to-channel current matching sets backlight uniformity; check the matching spec at the current you will actually run.
• In boost topologies the OVP threshold must clear the worst-case forward voltage of the longest string, including temperature and binning spread.
• Keep PWM dimming above 200 Hz to stay clear of visible flicker, and away from the audio band if the product has a speaker.
• Size the inductor and output capacitor for the string current ripple, not the total LED current.

Common Questions