STEVAL-ILL043V1 High end, 75 W high power factor flyback LED driver based on the L6562A with two dimmable strings Data brief Features Mains voltage range V = 165V , ACmin ac V = 277 V ACmax ac Minimum mains frequency f = 47 Hz l DC output voltage V = 65 V out Maximum output current I = 1.5 A out Maximum 2fL output ripple VO% = 1.0% Minimum switching frequency f = 40 KHz swmin Expected efficiency: 90% STEVAL-ILL043V1 RoHS compliant An integrated auxiliary power supply provides an Description energy saving action and a remote control monitoring function for the system. The STEVAL-ILL043V1 demonstration board is a high-PF flyback configuration in order to drive a This ballast designed by using the L6562A and new design of the 75 W LED array based on the the buck inverse converter offers more L6562A controller, with a much reduced BOM advantages in terms of output current and voltage cost. stability. This configuration uses an isolated feedback with The key benefit is the very high efficiency that, at an optocoupler and a secondary side full load, is almost 90%. reference/error amplifier. The inverse buck converter based on the L6562A is used for constant voltage and constant current control in double dimmable channels. The L6562A is a PFC controller operating in Transition mode. The highly linear multiplier includes a special circuit, able to reduce AC input current distortion, that allows wide-range-mains operation with an extremely low THD, even over a large load range. The inverse buck converter shows good performance in terms of power switch control and conditioning circuitry signal for the current sensing. In fact, this topology of converter allows easy driving of the switch referred to ground by using an L6562A driver. July 2012 Doc ID 023218 Rev 1 1/5 For further information contact your local STMicroelectronics sales office. www.st.com 5 5 1 0 Q) =& 5 / )% 1) 67 Q) 8 Q) X) Q) 1 & X) X) 9 9GF Q) P 9 /) 8 X) X) X) X) X) Q) P 9 X+ P 9 + 8 1 0 1 0 5 56 P 02 ( 16 ,6( 16 96( 1 0 5 P 9 P 9 8 Q) 0 . 08 1 0 1 0 1- 8 =& 1- 8 56 00 6= 9 56 00 6= 9 Q) . Q) X) U 9 QH Q) 9FF Q) 9FF 7 =& 1) Q) Q) X+ Q) Q) 9 X) OHF UH DF Q) X) Q) 59 Q) Q) X) + ) 677 X) 56 (7 0. 6 Schematic diagram STEVAL-ILL043V1 1 Schematic diagram Figure 1. Schematic diagram 6 6 6 6 5 5 0. 6 0. 6 + P+ P 67 61 7 ) 5 67 1) 5 5 5 6736 6736 ) 5 5 X/) S & ) S & /X ) & ) S & ) S 9,1B*1 // // 5 5 5 5 , B 0 0 & -3 F F 00 , B 5 5 9F F 9F F / 03 /7 ) 30 7/ ) / 9B/( 9B/( S & S . 5 . 5 5 5 . 5 5 5 5 . 0 B B0 & & 5 5 5 5 // // // // & & %& %& -3 5 -3 5 ) ) & S 5 & S 5 00 , B 00, B 5 ) 5 ) W W &B6H &B6H 9 // & S // & S // . 9 // 5 5 . 66 11 11 (( (( & 66 66 99 0 9B/( % 8 & 5 & 9 9 5 + P 1*B & 9 4 %& & 16 ( & . & 9 5 . 5 4 %& & 5 5 5 5 & 0 9B/( & 4 P 9 & %& 5 5 . & 5 . +X 5 5 . 5 9 & 9 & // ) 2) // 5 & 9 . 5 5 . 9 & : =H 5 . 9 5 5 & : 5 & 9 & 9 & . & 5 7 3 78 . 7/ ,/ 5 & < & % X+ / .1 2 - 3& & & 4 67) 5 6736 / 6736 & 9 5 . 5 + / 60 7 7 06 677 DQ & 5 . < & 5 & ) . %70 5 5 60 7 5 677 / + 5 6 2 85& ( F 5 6 2 85& ( & 9 03 5 , 1 5 5 . 9 5 , 1 5 , 1 ) /7 0 *) 5 , 1 *1 & S 9GF F 9G 9 / 07 % ,5() 9 5 5 5 5 . , 7 & 5 . &230 5 & ) & 9 P+ & 9 =& %& 9 & ) . 5 & 5 B 5 . 5 ( 56 0 5 3% 9 & & LWV + 6) . 0 P 9 6 7 & . & 5 5 5 :6(&B =& )) 2 0B B0 / 1 . 5 5 . - 0 9 DF - V 2/5 Doc ID 023218 Rev 1 Q) 3: / 7 ) / / 9,1 - - B /( & & B./( X) & & 9,1 / / ,& & ,19 9F 4 &2 * RU 4 08 *1 7 &6 X) & & . 0 5 . 0 . ,6 . ,6 9696 0 9F ,19 Q *1 &2 X) Q * &6 . 21 3: 3: 9 70 4 7 7UVI 3: / . - B /( & 21 B./( 9,1 92 70 / ,& ,19 9F 4 Q) &2 * RU 4 08 *1 &6 . N 5 . Q . N 9 *1 9,1 9,1B*1 9,1