LED driver eval board to accelerate development of LED streetlamps
To accelerate the creation of LED streetlamps and other medium- to high-power lighting applications, STMicroelectronics has introduced the EVL150W-HVSL LED-driver evaluation board and reference design.
The 150W, 1.0A mains input driver achieves full-load efficiency above 91 per cent to maximise utility-cost savings for streetlamp operators, explains ST. Electromagnetic interference (EMI) is within relevant EN55022 limits and input current total harmonic distortion (THD) less than 10 per cent at 230V AC from 30 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 90 to 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 one per cent at any frequency.
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, particularly suitable for LED driving. Proprietary features, such as the constant on-time PFC control, time shift 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 synchronised when in burst mode, reducing light load input power consumption to less than 0.5W. The compact 20-pin STCMB1 also integrates 800V start up circuitry as well as X-capacitor discharge and power-sequencing circuitry. No auxiliary power supply is needed.
Luminaires powered by the EVL150W-HVSL have output overload, output short circuit and open loop protection, each with auto-restart capability to satisfy street lighting requirements.
The EVL150W-HVSL is currently in volume production.