NON-ISOLATED BUCK OFFLINE LED DRIVER
DESCRIPTION
The UTC USL3631 is a high performance, high precision and
low cost constant current LED driver for non-isolated buck
application. The device operates in continuous conduction mode
and is suitable for 85V~265V universal input offline LED lighting.
It operates in continuous conduction mode, the output current
does not change with the inductance and LED output voltage.
The UTC USL3631 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 USL3631 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
* Continuous 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 |
