General description
The SSL6203TW is a monolithic high-voltage Integrated Circuit (IC) that can drive and dim three high-voltage LED strings directly from the rectified mains. The high level of integration gives a low-cost and low component count application, which is especially suitable for retrofit Solid-State Lighting (SSL).
The IC operates as a linear high-voltage current source. The string current in the LEDs can easily be adjusted. A patented LED drive scheme ensures optimal LED utilization.
The application can be dimmed. It also runs on a leading-edge phase cut dimmer with the integrated smart bleeder current.
To guarantee correct and proper operation, the SSL6203TW incorporates many protection features.
A thermally enhanced small outline package gets rid of the heat and makes integration of the whole application on the LED plate possible.

FEATUREs and benefits
High-voltage integration
■ Integrated 120 mA (120 V (AC) mains compatible) high-voltage current sources
■ Integrated bleeder high-voltage current source
■ Integrated low voltage supply regulator
■ Two high-voltage current sources per output for optimal heat balancing
■ Start up Junction Field Effect Transistor (JFET)
■ Integrated floating switches for improving LED utilization
■ Robust high-voltage IC with 330 V rating, compatible with 120 V (AC) mains voltage

Mains dimmable
■ Leading-edge dimmer compatible (phase-cut)
■ Adjustable bleeder current by a single resistor
■ Adjustable LED current by a single resistor or controlled by a current source
■ Low dimmer inrush current stress due to the absence of an electrolytic capacitor on
   the rectified mains

LED current
■ For high-voltage LEDs
■ Adjustable LED current using a single resistor or controlled by a current source
■ Adjustable LED current ripple using external capacitors
■ Drives three LED strings (typical string voltage ranges from approximately 43 V to
   50 V (120 V (AC) mains))
■ Overvoltage feedback for < 10 % line and load regulation
■ Two high-voltage current sources per output for optimal heat balancing
■ Patented LED drive scheme for optimal LED utilization (US 20130257282 A1)

Protections
■ UnderVoltage LockOut (UVLO)
■ Open LED protection on every LED string
■ Protected against shorted LEDs
■ OverTemperature Protection (OTP) on the high-voltage current sources

Thermal features
■ Reduced IC dissipation because of the presence of dual LED current outputs per
   string, enabling the application of external heat dissipation resistors
■ Thermally enhanced thin shrink small outline package ensuring the heat can be
   transported to the PCB easily
■ Optimized start-up current for instantaneous on-light output

Mains current
■ High power factor (> 0.9)
■ Total Harmonic Distortion (THD) according to the IEC61000-3-2 standard
■ No inrush current
■ No EMI filter

Cost
■ Low component count
■ No inductors
■ No mains electrolytic capacitor
■ No EMI filter

Form factor
■ Small form factor
■ No inductors
■ No EMI filter required as the SSL6203TW is a non-high-frequency switching converter
■ High integration level

Smart lighting
■ Setting the LED and BLEED pins to 0 V externally using a smart lighting system can
   switch off the IC.
■ Externally controlling the LED pin with a current source using a smart lighting system
   can dim the LEDs.

APPLICATIONs
■ 120 V (AC) mains dimmable retrofit SSL lamps