其具體的規格如下：

MP4021GS-A,30W以下隔離方案，全電壓輸入，電流波動1.5%以內, 260V時PF為0.95，效率在80%以上！

MPS4020/21 優勢在於：

1.集成PFC,功率因數很高，大部分情況下在93%以上，最高可達98%

2.源邊控制，省去光耦和相關電路，降低BOM cost

3.獨特的MOSFET控制技術，對MOSFET和快恢復二極管的要求降低很多，對少的方案必須選擇昂貴的MOSFET和二極管，進一步降低BOM COST

4.支持傳統的調光模式（原因是采用瞭獨特的MOSFET控制技術）。

總結: 隔離電源方案，效率85%、全電壓輸入，260V時PFC0.95、精度1.5%以內。MP4021是專門一顆針對LED驅動的芯片，功能全很多。單是PFC已經是很大的優勢，客戶會很看重這點，以及第二點的輸出過壓檢測（就是可以做開路保護）。

Description:

The MP4021 is a primary-side-control offline LED lighting controller that achieves high power factor and accurate LED current for single-power stage, isolated lighting applications. The proprietary real current control method accurately controls the LED current from the primary side , and therefore significantly simplifies the LED lighting system design by eliminating the secondary side feedback components and the optocoupler.

The MP4021 integrates power factor correction and works in boundary conduction mode to reduce the MOSFET switching losses.

The extremely low start-up current and quiescent current reduces the total power consumption to provide a high efficiency solution for lighting applications.
The multi-protection features of MP4021 significantly improves greatly enhance the system reliability and safety. The MP4021 features over-voltage protection, short-circuit protection, cycle-by-cycle current limit, VCC UVLO and auto-restart over-temperature protection.

Features

• Real Current Control Without Secondary-feedback Circuit
• Unique Architecture for Superior Line Regulation
• High Power Factor: ≥0.9 Over Universal Input Voltage
• Boundary Conduction Mode Improves Efficiency
• Ultra-low (10µA) Start Up Current
• Low (1mA) Quiescent Current
• Input UVLO
• Cycle-by-cycle Current Limit
• Over-voltage Protection
• Short-circuit Protection
• Over-temperature Protection
• Available in an SOIC8 Package

新手教學

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