DESCRIPTION

The UTC  USL3533K is a high performance, high precision

and low cost constant current LED driver for non-isolated buck

application. The device operates in critical conduction mode and

is suitable for 85V~265V universal input offline LED lighting. It

operates in critical conduction mode, the output current does not

change with the inductance and LED output voltage.

The UTC  USL3533K integrates a 500V power MOSFET. It

can achieve excellent constant current performance with very few

external components, so the system cost and size are minimized.

The UTC  USL3533K offers rich protection functions to

improve the system reliability, including LED open circuit

protection, LED short circuit protection, VCC under voltage

protection, CS resistor short  circuit protection and thermal

regulation function.

FEATURES

* Critical conduction mode operation

* Internal 500V Power MOSFET

* Ultra low operating current

* No auxiliary winding

* ±5% LED output current accuracy

* LED short protection

* LED open protection

* VCC under voltage protection

* Current sensing resistor short protection

* Thermal regulation function