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In order to design a highly efficient auto-dimmable LED street light with unstable mains input, Arrow has developed an LED street light solution based on AC mains input.
The solution selected Cree's lighting-grade XLamp MC-E LED, NXP's PFC controller and flyback controller SSL1750, and TI's DC/DC constant current controller TPS40211.
The XLamp XR-E LED is a lighting-grade multi-chip module. Cree currently offers 5W to 9W XLamp XR-E LED modules with a typical thermal resistance of 8°C/W.
NXP's SSL1750 is a switching power supply (SMPS) controller IC suitable for driving 25W to 250W LED lighting applications. For applications with power requirements below 25W, the SSL152x series and SSL1623PH are more suitable.
The SSL1750 integrates a PFC (Power Factor Correction) controller and a flyback controller that enables cost-effective LED drive power with a small number of external components. At all output power levels, its special green features ensure high efficiency. This applies to quasi-resonant operation at high power levels and down-conversion at lower power levels. At low power levels, the PFC transitions to burst mode to maintain high efficiency. In burst mode, soft start and soft stop functions have also been added to eliminate audible noise. At low power, the flyback controller switches to the down mode and limits the peak current to 25% of the maximum. This ensures high efficiency at low power while minimizing transformer audio noise. The SSL1750 makes AC/DC conversion more than 90% efficient.
The TPS40211 is a wide input (4.5V to 52V), asynchronous boost controller with a maximum output current of 700mA, allowing dimming by PWM and output voltages from 20V to 37V. It has an efficiency of 90% or more at 8-18V input. It is suitable for applications that require a source-grounded N-channel FET topology (such as boost, flyback, and SEPIC) and a variety of LED driver applications. Its main features include: programmable soft-start, overcurrent protection, automatic retry, and programmable oscillator frequency. Current mode control provides improved transient response and simplified loop compensation.
In addition, Arrow offers optical lens and optical solutions for LED streetlights. The ARR1-R60120-L1 is an optical lens specifically designed for LED streetlight applications. It features high efficiency, single beam pattern and consistent effects.
The above content is provided by WOSEN. WOSEN is a professional manufacturer and supplier of Led Flood Light, Led Street Light, Led Solar Light, etc. For more information, please visit https://www.wosenled.com/ or contact admin@wosenled.com or WhatsApp +86-13425434349
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