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.
Board part numbers: EVLHV101SSR50W and EVLHV101PSR50W
The EVLHV101SSR50W LED driver board provides a stable and insulated 60 V output voltage and a maximum power output of 50 W. The board can be used as a stand-alone power supply, or as the front-end stage in a dimmable or non-dimmable offline LED driver.
This demonstration board achieves a very high power factor, low total harmonic distortion and low bill-of-materials cost thanks to the features of the HVLED101, which adopts frequency foldback with valley-locking operation to reduce switching losses and minimize acoustic noise.
Input-voltage variations, excessive input voltage and insufficient input voltage are managed by the HVLED101’s protection functions, which improve the reliability of the application.
The EVLHV101SSR50W version of the board implements secondary-side regulation, and the EVLHV101PSR50W features primary-side regulation.
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