CONSTANT CURRENT CONTROLLER FOR NON-ISOLATED BUCK LED DRIVER

DESCRIPTION

The UTC  USL1602 is a high precision constant current

non-isolated buck LED driver controller. It can operate under

universal AC input, also can operate 12V~600V DC input. The UTC

USL1602 integrates 600V power MOSFET, so it can use very few

external components achieve  excellent constant current

performance.

The UTC USL1602 uses high precision current sense circuit, to

achieve high precision output current and excellent line regulation.

The UTC USL1602 operates in inductor current critical mode. The

LED current is constant over wide range of inductance variation and

the LED output voltage, so the load regulation is excellent.

The UTC  USL1602 operation current is 200uA only, so the

auxiliary winding is not needed. It can simplify the system design

and reduce the system cost.      

The UTC  USL1602 offers rich protection functions, including

LED short circuit protection, current sense resistor short circuit

protection and over temperature protection.  

FEATURES

* Inductor current critical mode, No need to compensate the inductance variation

* 600V MOSFET integrated

* Source driver structure, Not need the auxiliary winding for VCC

* ±3% LED current accuracy

* Up to 93% system efficiency

* LED short circuit protection

* Current sense resistor short circuit protection

* Over temperature protection