Integrated flyback controller boosts performance of LED lighting
The HVLED101 controller IC from STMicroelectronics maintains high power factor and very low power in standby mode, for precise regulation across a wide range of LED driver topologies.
The HVLED101 is an enhanced peak current-mode controller for flyback or buck-boost topologies that require a high power factor of at least 0.9 at full load. It also enables power-system designers to produce low total harmonic distortion of less than 5% at full load. Other topologies such as buck, boost and SEPIC can also be implemented with the HVLED101.
The HVLED101 is ideal for use in single-stage LED drivers rated for up to 180 W, and two‑stage LED drivers up to 200 W.
Both primary-side regulation of the output voltage and optocoupler control can be applied independently on the chip: both produce precise regulation. Standby power consumption in no-load conditions is very low.
The HVLED101 is built with innovative ST high-voltage technology which enables the IC to be connected directly to the input voltage in order to both start-up the device, and to monitor the input voltage without the need for external components. A valley-locking feature guarantees noise-free operation in medium- and low-load conditions.
The maximum power can be controlled by limiting the input power to a level programmed by the engineer, to ensure safe operation of the converter. The HVLED101 also controls abnormal conditions such as open circuit, output short-circuit, and input over- or under-voltage, as well as circuit failures such as open loop and over-currents at the main switch.