DimmerCompatibleLEDDriver方案.PDFVIP

Application Note 1583 ISL6745AHEVAL5Z and ISL6745ALEVAL5Z: TRIAC Dimmer Compatible LED Driver Abstract Features of the Board ISL6745AHEVAL5Z (high line) and ISL6745ALEVAL5Z • V : 160~270V (ISL6745AHEVAL5Z), 90V~144V IN AC (low line) are low cost, high performance LED drivers (ISL6745ALEVAL5Z) with Power Factor Correction (PFC). They use Intersil’s • I = 350/500/700mA/1.05A; V = 32/48V, O O voltage mode PWM controller ISL6745A to operate a PO(MAX) = 33W Flyback converter in Discontinuous Conduction Mode • Isolated, Flyback Converter (DCM) for PFC. The design gives high flexibility on both input and output conditions. With the same circuit • Active Single-Stage PFC, PF 0.95 configuration, they work well with wide range of TRIAC • TRIAC Dimmable (by “Open Loop Dimming”) with dimmers. The brightness of the LED can be well Inrush Current Control controlled by the dimmers with flicker free operation. • OCP: Pulse-by-Pulse OCP at Switching Frequency This driver circuit can be used for various LED lighting applications. The number of LEDs in a string can be as • OVP: OVP for Output Open Circuit Protection many as 9~12. The output current can be set to different • Efficiency: 80% levels from 350mA to 1A. Therefore, the evaluation • Dimension (L×W×H): 129×25×29mm3 boards can demonstrate high performance solutions for • Recommended LED Load: 1