Thursday, July 18, 2024

Evaluation Board For Superior Performance Of LED Streetlamps

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  • Meets lighting safety standards and its high efficiency maximises cost savings
  • Ensures protection from overload and short-circuits

For quickening the development of LED streetlamps and other medium- to high-power lighting applications, the STMicroelectronics EVL150W-HVSL LED-driver evaluation board and reference design integrates features that ensure high performance and lessen bill-of-materials (BOM) costs.

As a 150W, 1A mains-input driver, the EVL150W-HVSL achieves full-load efficiency above 91 per cent for maximising utility-cost savings for streetlamp operators. Electromagnetic interference (EMI) is within relevant EN55022 limits. Input-current total harmonic distortion (THD) less than 10 per cent at 230V AC from 30 per cent to 100 per cent of full load meets European EN61000-3-2 Class-C and Japanese JEITA-MITI Class-C norms for lighting equipment.

The EVL150W-HVSL has a universal 90V-264V AC input and meets IEC 60950-1 and 62368-1 safety standards. The board supports analogue, resistive and pulse width modulation (PWM) dimming modes, with flicker-free PWM dimming down to 1 per cent at any frequency.

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Constant current delivery

Additionally, the board contains ST’s STCMB1 integrated power-factor correction (PFC) controller and high-voltage resonant half-bridge controller working with the LCC topology, which can deliver constant current independently of the output voltage and is therefore well suited for driving LED. Proprietary features of this device, such as the constant on-time PFC control, timeshift control of the resonant half-bridge, and hard-switching prevention, save external components and ensure superior dynamic performance and ripple rejection. The PFC and half-bridge are synchronized in burst mode, reducing light-load input power consumption to less than 0.5W. The compact 20-pin STCMB1 also integrates 800V startup circuitry as well as X-capacitor discharge and power-sequencing circuitry. No auxiliary power supply is needed.

Luminaires powered by the EVL150W-HVSL benefit from comprehensive protection including output-overload, output short-circuit and open-loop protection, each with the auto-restart capability to satisfy street-lighting application requirements.

The EVL150W-HVSL is currently in volume production from ST and authorized distributors.


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