General description
The SSL3401HN is a Switched Mode Power Supply (SMPS) controller IC. It operates in combination with a phase cut dimmer and a 12 V (AC or DC) low voltage electronic or magnetic transformer. It is designed to drive LED devices and include a dimmer conduction phase detector.
The chip includes a hysteretic controller for the power converter. It is most suitable for use with a linear LED current source. Two embedded Proportional-Integral (PI) controllers and a 0.052 % resolution PWM generator, adjusted by the dimmer conduction phase, ensure excellent LED current stability for a dimming range from 100 % to less than 5 %. It also minimizes the power loss across the LED current source.

FEATUREs and benefits
◾ Easy migration to existing lighting control infrastructure
◾ Support most available dimming and low-voltage transformation solutions
◾ Excellent stability of LED current
◾ Double PI controllers to enhance the line regulation of the LED current
◾ Optimized dimming curve for low-voltage transformer compatibility
◾ Automatic supply frequency detection for seamless operation with 50 Hz, 60 Hz or DC sources
◾ Dimmer conduction angle detection
◾ Coil current limitation
◾ Temperature roll-back protection
◾ OverVoltage Protection
◾ Power-On-Reset (POR)
◾ Shorted LED protection
◾ Open LED detection

APPLICATIONs
◾ General LED lighting with various power requirements
◾ Dimmable 12 V MR16 and AR111 applications