Single-stage flyback controllers optimised for cost-effective smart LED drivers

Infineon Technologies AG is addressing the demand of LED driver manufacturers for cost-effective dimmable and intelligent LED systems. With unique features, the ICs satisfy the required performance necessities for LED lighting applications, such as LED drivers and luminaires up to 125W, smart lighting, and emergency luminaires. Outside this market area, adapters and chargers, flat TVs, all-in-one PCs, and monitors up to 125W gain from the ICL88xx family.

All three alternatives provide benchmarking performance for PFC and total harmonic distortion at full-load and low-load conditions, therefore facilitating platform design and window drivers. They are optimised as SSR CV output flyback controllers and are also ideal for PSR. To attain optimum efficiency and low EMI with no compromise on light quality, they feature CCM and QRM with smart valley hopping.

The family provides an external start-up circuit control signal for more flexibility and a cost-optimized bottom-up platform design for multiple applications. It offers a comprehensive set of protection features, incorporating a power limitation and secondary side over-voltage protection. Also, the devices need a minimum number of external components, leading to exceptional cost-effectiveness compared to existing solutions. The gate driver current allows designs up to 125W with state-of-the-art MOSFETs. The system performance and efficiency can be optimised, still further utilising the company's CoolMOS P7 power MOSFETs.

ICL8800 is the basic variant offering all of the above features. ICL8810 is an advanced alternative with an integrated burst mode that enables a very low standby power consumption of less than 100mW and flicker-free deep dimming down to 0.1%. This feature makes it suitable for smart lighting applications in connection with microcontrollers. Finally, ICL8820 is the fully-featured version, further equipped with an integrated DC-input jitter function. The latter increases EMI performance and supports the fulfilment of EMI demands in DC operation. It eases EMI certification in creating emergency lighting LED driver applications with no additional circuitry, minimising cost and effort.