SSL2101: LED Flyback Driver Solution

NXP's SSL2101 is a 120V AC LED flyback driver that can work directly from the live voltage rectifier. The device includes a high-voltage power switch and a circuit that starts directly from the live voltage rectifier, supporting most dimming schemes. Built-in over-temperature protection (OTP), over-current protection (OCP) and winding short-circuit protection (SWP) are mainly used in decorative lamps up to 10W such as GU10, LED drivers, LED strings up to 15W, and 1W-10W LED lamps. This article introduces the main features, block diagram, flyback circuit diagram (applicable to 230V TRIAC) of SSL2101, as well as the SSL2101 light reference board, main indicators, circuit diagram and bill of materials.

SSL2101 is a switch mode power supply (SMPS) controller IC that is combined with a phase dimmer and connected to the rectified main power line (mains voltage) to drive LED devices. The device includes a high-voltage power switch and circuits for starting directly from the main power voltage. In addition, the device also has a high-voltage circuit for powering phase dimmers.

Figure 1 SSL2101 block diagram

Figure 2 SSL2101 reference board outline

Key features

• Can be used with existing lighting control infrastructure, triacs, transistors, dimmers

• Supports most dimming solutions

• Optimized for valley conversion efficiency through built-in dedicated circuits

• Built-in demagnetization detection

• Built-in over-temperature protection (OTP)

• Short winding protection (SWP) and over-current protection (OCP)

• Internal VCC allows startup from rectified mains voltage

• Natural dimming curve logarithmic correction


Figure 3 SSL2101 light reference board specifications

SSL2101 applications

SSL2101 is suitable for different power requirements, including:

• Retrofit luminaires such as GU10, up to 10W

• LED modules, separate power supplies, LED points, small spotlights, up to 15W

• LED strings such as retail displays, up to 15W

• Power-isolated LED drivers, up to 10W to 15W (flyback topology)

• Non-power isolated LED driver (buck topology) with maximum peak current of 900 mA and continuous LED current less than 450 mA

• LED lamps 1 W to 10 W (flyback) or 450 mA (buck)

SSL2101 Light Reference Board

The SSL2101 work light board is a 120 V (ac), dimmable 450 mA LED driver board. It uses a flyback converter to drive power LEDs that require galvanic isolation. The board design highlights high performance dimming, wide dimmer compatibility, high efficiency and the ability to drive different numbers of LEDs.