DS12748 Rev 2

17/33

HVLED001B

Application information

33

7

Application information

7.1

Operating modes

The HVLED001B QR flyback controller is able to operate either as a single-stage high

power factor (HPF) flyback controller or as a DC/DC flyback controller in dual-stage

topologies. It‘s enhanced features are mainly intended to simplify the design and the

management of constant current applications (LED drivers).

Application schematics of the two main topologies are reported in Figure 17 and Figure 18.

Figure 17. High power factor flyback - Primary side regulated constant output voltage