The UCC2871x family of flyback power supply controllers 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 UCC28710 family allow operating efficiencies to meet or exceed
applicable standards. The output drive interfaces to a MOSFET 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 controllers have a maximum switching frequency of 100 kHz and always maintain control
of the peak-primary current in the transformer. Protection features help keep primary and secondary
component stresses in check. The UCC28710 allow the cable compensation to be programmed. The
UCC28711, UCC28712 and UCC28713 devices allow remote temperature sensing using a negative
temperature coefficient (NTC) resistor while providing fixed cable-compensation levels.
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