Datasheet Texas Instruments UCC28730D — Datenblatt

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SLUSBL5 – FEBRUARY 2015 UCC28730 Zero-Power Standby PSR Flyback Controller
with CVCC and Wake-Up Monitoring
1 Features 3 Description 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 wake-up 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
wake-up monitoring works with a secondary-side
alarm device such as the UCC24650 to deliver rapid
response to heavy load steps using minimal output
capacitance. Enables Zero-Power (1.2 Вµs is achieved.
t ON (min ) = LP …