Power Integration

Demoboard DER-630

12 W High Efficiency, High Power Factor, Isolated Flyback Power Supply for Smart Lighting Using LYTSwitch-6

Topologie: Flyback
Eingangsspannung (min.): 90.00 V
Eingangsspannung (max.): 265.00 V
Ausgang 1: 27.00 V / 0.450 A

Erstveröffentlichung am 21.05.2018, Version 1.0


This engineering report describes a 12 W isolated flyback power supply with a single-stage power factor correction circuit for smart lighting applications. The power supply is designed to provide a 27 V constant voltage output across 0 mA to 450 mA output current load and throughout the input voltage from 90 VAC to 265 VAC. The power supply IC controller device, LYTSwitch-6, combines primary, secondary and feedback circuits in a single surface-mounted off-line flyback switcher IC. It incorporates the primary MOSFET, the primary-side controller and a secondary-side synchronous rectification controller. The device also includes an innovative new technology, FluxLink™, which safely bridges the isolation barrier and eliminates the need for an optocoupler. DER-630 using a LYTSwitch-6 IC is a universal input flyback converter design added with a switched valley-fill PFC circuit. This design offers a highly efficient constant voltage supply with a fast transient load response. Through the PFC circuit, the design achieves high power factor across universal input. The key design goals were high efficiency and high power factor across the input voltage range.


  • Accurate constant voltage regulation
  • Fast transient load response
  • High power factor
  • Highly energy efficient
  • Low standby power
  • Low component count
  • Integrated protection and reliability features
  • Output short-circuit
  • Line and output OVP
  • Line surge or line overvoltage
  • 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


  Artikel Nr. SPEC Produktserie L
RDC typ.
RDC max.
Montageart Muster
768772182 PDF WE-TI HV Tonneninduktivität (High Voltage) 1800 0.35 0.38 3 3.3 1.4 THT