MP4057A

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. The MP4057A is the most ideal solution for smart LED lighting because of its simplest design, fewest external components, and lowest cost. The MP4057A achieves a high power factor and accurate LED current. The proprietary real-current-control method accurately controls LED current from the primary-side information. The MP4057A integrates power-factor correction and works in valley switching mode to reduce MOSFET switching loss. The MP4057A achieves ultra-low standby loss (typically 30mW no-load power) by decreasing the working frequency in standby mode. The MP4057 has an integrated charging circuit at the supply pin for fast start-up without a perceptible delay. Based on the information from DIM, the MP4057A can operate in two operation modes: constant current (CC) and constant-voltage (CV). The LED can turn off when the MP4057A works in CV mode. During the transition between CC and CV, the LED does not flicker, and the voltage of the MCU/wireless module does not drop. The MP4057A’s multiple protection features enhance system reliability and safety greatly. These features include over-voltage protection (OVP), short-circuit protection (SCP), primary-side over-current protection (OCP), brown-out protection, cycle-by-cycle current limiting protection, under-voltage lockout (UVLO), and auto-restart over-temperature protection (OTP). The MP4057A is available in MSOP-10 and SOIC14 packages.