UCC28730 Texas instruments

UCC28730

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UCC28730

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Описание

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.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.

Enables Zero-Power (<5 mW) standby consumption
Smart Wake-Up detection enables smallest output capacitance
Primary-side regulation (PSR) eliminates optocoupler
±5% voltage regulation and current regulation across line and load
700-V start-up switch
83-kHz maximum switching frequency enables low stand-by power charger designs
Resonant-ring valley-switching operation for highest overall efficiency
Frequency-dither to ease EMI compliance
Clamped gate-drive output for MOSFET
Overvoltage, low-line, and overcurrent protection functions
Programmable cable compensation
SOIC-7 package

Vin (min) (V)	27
Vin (max) (V)	450, 700
Vout (min) (V)	3.3
Vout (max) (V)	48
Iout (max) (A)	6
Iq (typ) (mA)	2
Switching frequency (min) (kHz)	0.032
Switching frequency (max) (kHz)	83
Features	Current limiting, DCM, Green mode, High-voltage startup, Input line monitor, Leading edge blanking, Light-load efficiency, Low power, PSR, Secondary-side wake up, Soft start, Thermal shutdown, Valley switching
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Control mode	Primary-side regulation