HVLED805 STMicroelectronics

HVLED805 Off-line LED driver with primary-sensing Features 800 V, avalanche rugged internal power MOSFET 5% accuracy on constant LED output current with primary control Optocoupler not needed Quasi-resonant (QR) zero voltage switching SO16N (ZVS) operation Internal HV start-up circuit Table 1. Device summary Open or short LED string management Order codes Package Packaging Automatic self supply HVLED805 Tube Input voltage feed-forward for mains SO16N independent cc regulation HVLED805TR Tape and reel Applications AC-DC led driver applications LED retrofit lamps (i.e. E27, GU10) Figure 1. Application diagram Vin VCC HV start-up & DRAIN SUPPLY LOGIC PROTECTION & FEEDFORWARD Vref LOGIC LED DE MAG ... LOGIC DRIVING CONSTANT DMG LOGIC CURRENT Rdmg REGULATION 3.3V Vref 1V Rfb OCP CONSTANT VOLTAGE REGULATION Vc COMP ILED GND SOURCE Rcomp Rsense CLED Ccomp October 2010 Doc ID 18077 Rev 1 1/29 www.st.com 29Contents HVLED805 Contents 1 Description . 3 2 Maximum ratings 4 3 Electrical characteristics . 5 4 Pin connection 7 5 Application information . 12 5.1 Power section and gate driver . 13 5.2 High voltage startup generator . 13 5.3 Secondary side demagnetization detection and triggering block . 15 5.4 Constant voltage operation . 16 5.5 Constant current operation 18 5.6 Voltage feedforward block 20 5.7 Burst-mode operation at no load or very light load 22 5.8 Soft-start and starter block 23 5.9 Hiccup mode OCP 23 5.10 Layout recommendations . 24 6 Package mechanical data 26 7 Revision history . 28 2/29 Doc ID 18077 Rev 1