MP4057A Single-Stage Single Chip Solution MSOP-10

MP4057A Single-Stage Single Chip Solution MSOP-10

The MP4057A is a single-chip/single-stage solution for smart LED applications that can regulate LED current with primary-side regulation (PSR) control and supply power for microcontroller units (MCU) and wireless modules.

Key Specifications

Features

• Single-Chip/Single-Stage with LED Driver and Power Supply for MCU/Wireless Modules
• Fast Start-Up
• Ultra-Low Standby Loss, Typically Less Than 30mW in No-Load Condition, Optional Circuit for Less than 15mW at No Load
• 5% Deep Dimming
• No Flicker
• Low Audible Noise
• Valley Switching Mode in CC Mode for Good Efficiency
• Good Power Factor (PF) (Typically >0.9)
• Good Transient Response
• Cycle-by-Cycle Current Limit Protection in CV Mode

Typical Application Circuit

Applications

• Zigbee/Bluetooth Smart 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