43 W high power factor constant voltage output flyback converter based on ICL8820

REF_ICL8820_LED_43W_JT This 43 W reference design uses Infineon's high power factor flyback controller ICL8820. The evaluation board is a constant voltage (CV) secondary side regulation (SSR) system designed for use with a constant current (CC) converter for LED lighting applications.

Two-stage topologies are becoming increasingly popular due to the easy scalability of primary-side power and secondary-side characteristics. REF_ICL8820_LED_43W_JT is a plug-and-play solution.

As a default, the reference design board is equipped with a depletion mode MOSFET BSS126I based startup circuit on a small adapter board. This setup will significantly reduce standby losses. If low standby power consumption is not required, the startup circuit can be changed to a resistive startup design.

This reference design comes with two conditioning circuits. Both are plug-and-play solutions, but at least one circuit must be connected to the motherboard. There is a cost trade-off between the two evaluation boards; the TL431 evaluation board is lower cost and has good standby performance, while the op amp board exhibits excellent overall performance at the 30 mW power level. With its benchmark power factor correction and total harmonic distortion performance at full and light load conditions, the ICL8820 supports window driver and platform designs. In addition, the IC combines excellent efficiency with low EMI characteristics without compromising light quality.

As a complete functional product of the ICL88xx series, ICL8820 is particularly suitable for switching LED drivers, with a dimming depth as low as 0.1% and support for dimming. In addition, the controller integrates burst mode and dithering capabilities to significantly reduce standby power to less than 100 mW. The product has a built-in dither function, eliminating the need for additional circuitry, thus simplifying the EMI certification process. Therefore, the ICL8820 is not only an ideal device for smart lighting, but also enables the design of emergency lighting LED drivers at low cost and effort.

Feature description

Constant voltage (CV) secondary-side regulation (SSR) reference design for LED lighting applications
ICL8820 integrates burst mode to achieve very low standby power of less than 100 mW, and its built-in dithering function simplifies the EMI certification process and eliminates the need for additional configurations Circuit
power factor (PF) > 0.9 and THD < 10%, applicable to a wide load range (AC input up to 277 Vrms)
Maximum AC input voltage: 90 – 305 Vrms
Supports critical conduction mode and quasi-resonant mode with smart valley jumping

Advantage

Ideal topology for smart LED drivers. The minimum dimming level of the driver is 0.1%. It supports dimming
to create smart lighting.
Two-level topology that combines scalability and many functions.
Ultra-high light quality.
Cost-effective and bottom-up design.
Flexible . High strength, low material cost, suitable for a variety of applications

Potential applications

LED Lighting/LED Drivers and Luminaires up to 125 W
Smart Lighting/Emergency Lighting
Adapters and Chargers, Flat Screen TVs, All-in-One PCs, Monitors up to 125 W