The UCC28730 isolated-flyback power supply controller provides Constant-Voltage (CV) and
Constant-Current (CC) output regulation without the use of an optical coupler, and
signal detection to improve transient response to large
load steps. A minimum switching frequency of 30 Hz facilitates achieving less than 5 mW of no-load
power. This device processes information from the primary power switch and an auxiliary flyback
winding for precise control of output voltage and current. The monitoring works with a secondary-side alarm device such as the
UCC24650 to deliver rapid response to heavy load steps using minimal output capacitance.
An internal 700-V start-up switch, dynamically- controlled operating states and a
tailored modulation profile support ultra-low stand-by power without sacrificing start-up time or
output transient response. Control algorithms in the UCC28730 allow operating efficiencies to meet
or exceed applicable standards. Discontinuous conduction mode (DCM) operation with valley-switching
reduces switching losses. Modulation of the switching frequency and primary current peak amplitude
(FM and AM) keeps the conversion efficiency high across the entire load and line ranges.
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