New SMPS Controller Supports 250W LED Systems

NXP has introduced an integrated SMPS controller IC that allows the design of reliable, high-power LED drivers using very few external components.

The SSL1750 supports LED drivers with power ratings ranging from 25W up to 250W. Features offered by the device include a controller for Power Factor Correction (PFC) and a flyback controller. The IC also provides a large number of protection functions, including under- and over-voltage protection.

The device integrates a number of features that provide high efficiency at all power levels. This applies to quasiresonant operation at high power levels, quasi-resonant operation with valley skipping and reduced-frequency operation at lower power levels. At low power levels, the PFC switches over to burst-mode control to maintain high efficiency. In burst mode, soft-start and soft-stop functions are added to eliminate audible noise.

During low-power conditions, the flyback controller switches to frequency-reduction mode and limits the peak current to 25% of its maximum value. This ensures high efficiency at low power while minimising audible noise from the transformer.

 

FEATURES Universal mains supply operation: 70V AC to 276V AC Valley and zero-voltage switching for minimum switching losses Frequency limitation to reduce switching losses Burst-mode operation if a low load is detected at the flyback output Under-voltage protection (foldback during overload) Accurate over-voltage protection (adjustable for flyback converter)

 

 

 

• NIC Components’ Quick Kit, page 090119

 

NXP / SSL1750