NXP's SSL5511T is an offline dimmable controller IC, intended to drive dimmable LEDs in general lighting applications, like remote-controlled luminaires and smart lamps. The IC drives an external switch for easy power scaling. It has been designed to start up directly from the High-Voltage (HV) supply by an internal high-voltage current source. Flyback, buck and buck-boost circuit topologies are supported. Primary side sensing provides accurate output current control.
The IC can detect analog signals (according to IEC60929 annex E) or digital control signals and translate them to a continuous LED current in multiple ways. It can operate in three switching modes at two switching frequency ranges. It offers tradeoffs between the output current ripple, the mains current Total Harmonic Distortion (THD) and the application size. The IC incorporates many protection features.
The SSL5511DB1214 is a 100 V 20 W non-isolated 0-10 V dimmable LED driver demo board (shown).
Features and benefits
· High-efficiency switch mode buck, flyback or buck-boost controller driving an external power FET
· Selectable low THD or low LED current ripple modes
· Analog IEC60929 input or digital control input for dimming
· Continuous (analog) regulation of LED current in both the dimming control modes
· Dim curve selection based on the control input type
· Full range of internal protections
· Low component count LED driver solution