Power Integrations LYT6067C | Demoboard DER-847

Description

This engineering report describes a constant voltage (CV) and constant current (CC) output 42 W LED ballast with 3-way dimming function, Correlated Color Temperature (CCT) function, and power selection multi-set feature. At constant voltage application, the LED ballast is designed to provide a 42 V output voltage across 0 mA to 1200 mA output current load while at constant current mode operation, it can provide 1200 mA (3way dimmable) constant current at 42 V – 30 V LED voltage string. The design is optimized to operate from an input voltage range of 100 VAC to 277 VAC. The LED ballast employs a two-stage design with a boost PFC at first stage and an isolated flyback DC-DC for the secondary stage. The boost PFC utilizes HiperPFS-4 device while the second stage flyback uses LYTSwitch-6 controller. The HiperPFS-4 devices incorporate a continuous conduction mode (CCM) boost PFC controller, gate driver and 600 V power MOSFET in a single power package. This device eliminates the need for external current sense resistors and their associated power loss, and use an innovative control technique that adjusts the switching frequency over output load, input line voltage, and input line cycle. LYTSwitch-6 ICs simplifies the flyback stage by combining primary, secondary and feedback circuits in a single surface IC. This IC includes an innovative new technology,FluxLink™, which safely bridges the isolation barrier and eliminates the need for an optocoupler. The single architecture of LYTSwitch-6 allows the IC to have primary and secondary controllers, with sense elements and a safety-rated mechanism into a single IC. DER-847 key design goals offer high power factor (>0.90), low THD (<15%) at nominal input, high efficiency, and low component count at universal input voltages. The document contains the power supply specification, schematic, bill of materials, transformer documentation,printed circuit layout, and performance data.

Features

• With integrated PFC function, PF >0.90
• Low THD <15% at nominal 
• Accurate output voltage and current regulation, ±5%
• Low ripple current 
• Highly energy efficient, >89% at 230 VAC
• Low cost and low component count for compact PCB solution 
• Compatible with 3-Way dimming application 
• With Multi-Set Feature: Power Selection and CCT Selection 
• Integrated protection and reliability features
• Output short-circuit 
• Line and output OVP 
• Line surge or line overvoltage 
• Thermal foldback and over temperature shutdown with hysteretic automatic power recovery 
• No damage during line brown-out or brown-in conditions 
• Meets IEC 2.5 kV ring wave, 1 kV differential surge 
• Meets EN55015 conducted EMI

Typical applications

• LED Lighting Ballast

More information

• Datasheet
• IC product information