Power Integrations LYT3315D | Demoboard DER-502

Description

This engineering report describes a TRIAC dimmable, isolated flyback LED driver designed to drive a nominal LED voltage string of 27 V at 350 mA from an input voltage range of 90 VAC to 132 VAC. The LED driver utilizes the LYT3315D from the LYTSwitch-3 family of devices. LYTSwitch-3 is a family of devices which are designed especially for TRIAC dimmable LED drivers with a single stage PFC function and accurate LED current control. DER-502 is a single 9.5 W TRIAC dimmable LED driver with constant current output. Key design goals were high efficiency, compact PCB and excellent dimming compatibility. The design is intended for downlight LED applications. This document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, design spreadsheet and performance data.

Features

• Single-stage power factor corrected, PF >0.9
• Accurate constant LED current (CC) regulation, ±5%
• High efficiency
• Low cost and low component count for compact PCB solution
• TRIAC dimmable
• Works with a wide selection of TRIAC dimmers
• Fast start-up time (<500 ms) – no perceptible delay
• Minimum dead-band or visible pop on effect.
• Integrated protection features
• Open load and output short-circuit protection
• Thermal fold-back protection
• No damage during line brown-out or brown-in conditions
• Meets IEC 2.5 kV ring wave, 1 kV differential surge and EN55015 conducted EMI

Typical applications

• Downlight LED

More information

• Datasheet
• IC product information