第三代非隔离高恒流精度高功率密度LED驱动技术-www.EET-.PDF

www.EET- LED LED 2 TRUEC BUCKLED 2 TRUEC LEDMOSFET TRUEC2 LED DU8623 DU8633 2  LED Constant Current Control Solution based on TRUEC Technology Abstract: This paper presents the principle of a non-isolated BUCK topology based on TRUEC2 constant current control, using integrated MOSFET PWM control IC: Duty Cycle Company’s DU8623 and DU8633. The experiment demonstrates that this control method can effectively increase the accuracy of the output current, which is not subject to the line voltage and external inductor. The Robustness is also increased compare with open loop control solution. The integration of MOFET results in the decreasing of external components, which in turn decreases total cost. 2 Keyword: TRUEC /LED Constant Current Control / Close loop current control/ DU8623 DU8633 1 LED BUCK LED DU8623/DU8633 LED 7W 2. 1 LED LED PWM UC384X 50% www.EET www.EET- EMI HV9910(PT4107SMD802FT870LNK506 PI; LED Toff 100% HB9910B SN3910LM3445 ) 1 BUCK MOSFET MOSFET DCBUS LED Vi-Vo=L =L (1) MOSFET D1 Vo= L =L (2) 1Io(average)= Ipk- (3) 23 www.EET www.EET- Io= -Vo* (4)