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Product introduction | MT765X: flicker-free, linear PWM dimming solution

  • Release Date2021-01-15

  • Page View2256 times

As market required, Maxic launched the new generation low cost, high performance, flicker-free, linear PWM smart dimming products: MT7651L/H and MT7652L/H. In order to meet the requirements of EU’s new ERP standard, Maxic took the lead in launching the linear PWM smart dimming products: MT7656L/H and MT7658L/H.


 Product Selection 



 Features 


  • Ultra-low power consumption

           Single channel: <5mW@120Vac，<10mW@230Vac

           Dual-channel: <10mW@120Vac，<20mW@230Vac

  • Low to 1% dimming depth and 0.1% dimming resolution

  • 1%-100% PWM dimming, no flicker across the full range

  • <10KHz PWM frequency

  • High constant current accuracy (100% Duty，<±3%)

  • High constant current accuracy at low end (3% Duty，<±5%)

  • >750V (no fuse) anti-surge capability

  • MT7656H and MT7658H: PF>0.7, no flicker, meets the THD requirement of new EU’s standard

  • Excellent EMI performance with low BOM cost


 Typical scheme 



a、Typical scheme 1


Parameters of MT7651L-8.5W scheme

Input voltage：108Vac-132Vac

Input power：8.5W

Output voltage：128V

Output current：50mA





Schematic diagram



Performance



Dimming curve



EMI Performance

120Vac  L

120Vac  N

120Vac  CDN



b、Typical scheme 2


MT7656H-8.5W scheme

Input voltage：220Vac-240Vac

Input power：8.5W

Output voltage：252V

Output current：27mA





Schematic diagram



Performance

THD：IIN波形curve：

The input current shall be such that it reaches the 5% current threshold before or at 60o, has its peak value before or at 65o and does not fall below the 5% current threshold before 90°.

CH1(yellow)：Vin，CH2(blue)：Vcap ，CH4(green)：Iin 230Vac



Dimming curve



EMI Performance

230Vac  L

230Vac  N

230Vac  CDN