Power Integrations releases compact 25W LED lighting ballast reference design for T8 tubes
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DER-287 reference design
Power Integrations has published the DER-287 reference design for a 25W LED T8 tube ballast power supply designed to reach 91 per cent efficiency and to be used in commercial and industrial lighting.
The DER-287 is a single-stage converter built around LNK409EG, from the Linkswitch-PH family of LED driver ICs, and meets commercial requirements for power factor (PF greater than 0.9) and harmonic distortion (EN61000-3-2 Class C).
According to Power Integrations, single-stage technology increases product lifetime by eliminating the opto-isolators and large aluminium electrolytic input bulk capacitors required by conventional two-stage solutions.
The single-stage IC DER-287 has a monolithic design that combines controller, driver, switching MOSFETs and protection features into a single package, meaning that implementation requires very few external components — which is beneficial to compact T8 tube enclosures.
The Linkswitch-PH video, data sheet, application notes, and other design examples are available on the company’s website.
- Monolithic design
- Power factor greater than 0.9
- Harmonic distortion: EN61000-3-2 Class C
- Reaches 91 per cent efficiency
- Low THD and high PF meet commercial requirements
- Features over-temperature and over-current protection
Power Integrations has launched its Linkswitch-3 series of integrated monolithic switching ICs. The devices are claimed to deliver accurate primary-side regulation for chargers and adapters up to 10W, making them suitable for smartphones, tablets and other mobile devices, particularly those subject to 30mW no-load limitations, such as upcoming mandatory US DoE EPS efficiency regulations and EU CoC Tier 2 guidelines.
This document from Power Integrations is an engineering report describing a non-isolated LED driver (power supply) utilising a LNK458KG from the Linkswitch-PL series of devices.
The Linkswitch-PH has been developed to cost-effectively design a single-stage power-factor-corrected LED driver with primary-side constant-current control.
This design idea presents the schematic for a CV/CC power supply for LED driver applications using the Linkswitch-II LNK605DG.
The power supply shown in this design idea uses a Linkswitch-TN device in a boost converter configuration to deliver a constant current of 20mA from a single positive voltage of 554VDC.