The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage
(CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices
process information from the primary power switch and an auxiliary flyback winding for precise
control of output voltage and current.
An internal 700-V start-up switch, dynamically-controlled operating states and a tailored
modulation profile support ultra-low standby power without sacrificing start-up time or output
Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed
applicable standards. The output drive interfaces to a bipolar transistor power switch.
Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of
switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency
high across the entire load and line ranges.
The controller has a maximum switching frequency of 80 kHz and always maintains control
of the peak-primary current in the transformer. Protection features help keep primary and secondary
component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be
programmed with an external resistor.