Linear Technology - LT3799 and LT3799-1
Offline Isolated Flyback LED Controller with Active PFC

LT3799 Characteristics

  • Isolated PFC LED driver 
  • TRIAC dimmable (only available on LT3799) 
  • No opto-coupler required 
  • Active PFC (typical PFC > 0.97) 
  • Input voltage: 90V-270VRMS 
  • LT3799-1 offers improved line regulation over the LT3799 

Applications

  • Offline 4W to 100W+ LED applications 
  • High DC Vin LED applications 

Inductors and CMCs

Inductor - 750311431 - .75mH
Filter Choke- 7447018 - 150µH
CMC - 7448640418 - 33mH
CMC - 744821039 - 39mH

Transformer Characteristics

  • Flyback topology  
  • Designs for Universal, US and European input voltages  
  • Special winding technique achieves low leakage inductance (<1%)  
  • High dielectric (Hipot) withstanding requirement – up to 4.5KVAC  
  • Reinforced insulation for universal voltages  
  • Transformer designs ranging from 4W to 100W+  
Part Number Target Application
(VOUT/IOUT) 		LPRI
(µH) 		NPSA
(NP:NS:NA) 		RPRI
(mΩ) 		RSEC
(mΩ)
(tied in parallel)
7508110210 10V/0.4A 2000 6.67:1:1.67 5100 92.4
750813002 3.8V/1.1A 2000 20:1:5 6250 16.2
750811330 18V/5A 300 6:1:1 150 8.3
750813144 28V/0.5A 600 4:1:0.71 2400 241.8
750813134 14V/1A 600 8:1:1.28 1850 60
750811291 85V/0.4 400 1:1:0.24 550 1230
750813390 90V/1A 100 1:1:0.22 150 222.7
750811290 125V/0.32A 460 1:1:0.17 600 254.6
7508111417 28V/0.5A 700 4:1:0.86 1340 58.3
750811351 36V/3A 180 4:1:0.67 135 80