In order to meet the requirements of European Union's new ERP standard, Maxic launched MT7618N, the 1st generation new EU solution in early 2020. MT7618N is designed for new EU DOB bulb application, with simple peripheral circuit and low BOM cost. Besides, Maxic launched the 2nd generation solution, MT7668H, to meet the light efficiency requirement of the new standard that released on September 1, 2021. MT7668H is a high PF (PF＞0.7), high efficiency, flicker-free, constant current LED driver. MT7668H has higher than 84%@AC230V efficiency, which is 4% higher than market existing products (product B). The low power consumption allows MT7668H to support single panel PCB filament lamp, saving ￥0.1 yuan (Size E27) PCB cost compared with product B’s double panel.

efficiency curve compassion

Meanwhile, MT7668H integrates high voltage power MOS and high voltage power supply circuit, no magnetic components are required, such as inductor and transformer, and has simple peripheral circuit.

 Features 

 

PF＞0.7，滿(man)足新歐標Harmonic的要求

無頻閃，Pst LM≤1.0，SVM≤0.4@AC230V

高效率，大于84%@AC230V，比市面B產品高出4%

支持單面板PCB 7W應用，比市面B產品雙面板應用節省成本0.1元

外圍電路簡單，支持全貼片設計方案

外置線電壓補償功能，可實現輸入功率恒定

芯片應用系統無EMI問題

過溫自動調節功能

 典型應用原理圖 

Typical application scheme 

MT7668H-7W filament lamp single-panel scheme

Input voltage：AC220V~AC240V

Output voltage：262V

Output current：23mA

layout

Power supply performance

High efficiency：84.3%@AC230V

No flicker

Harmornic

PF comparison

EMI performance

 230Vac  L

230Va  N

230Vac  CDN