UCC28911 Texas instruments

UCC28911

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UCC28911

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Описание

The UCC28910 and UCC28911 are high-voltage flyback switchers that provide output voltageand current regulation without the use of an optical coupler. Both devices incorporate a 700-Vpower FET and a controller that process operating information from the flyback auxiliary windingand power FET to provide a precise output voltage and current control. The integrated high-voltage current source for startup that is switched off during device operation, and the controller current consumption is dynamically adjusted with load. Both enablethe very low stand-by power consumption. Control algorithms in the UCC28910 and UCC28911, combining switching frequency and peakprimary current modulation, allow operating efficiencies to meet or exceed applicable standards.Discontinuous conduction mode (DCM) with valley switching is used to reduce switching losses.Built-in protection features help to keep secondary and primary component stress levels in check across the operating range. The frequency jitter helps to reduce EMI filter

Constant-Voltage (CV) and Constant-Current (CC) Output Regulation Without Optical-Coupler
±5% Output Voltage Regulation Accuracy
±5% Output Current Regulation With AC Line and Primary Inductance Tolerance Compensation
700-V Start-Up and Smart Power Management Enables <30-mW Standby Power
115-kHz Maximum Switching Frequency Design for High-Power Density
Valley Switching and Frequency Dithering to Ease EMI Compliance
Thermal Shut Down
Low Line and Output Over-Voltage Protection

Vin (min) (V)	10
Vin (max) (V)	450
Vout (min) (V)	3.3
Vout (max) (V)	18
Iout (max) (A)	0.7
Iq (typ) (mA)	23.5
Switching frequency (min) (kHz)	0.42
Switching frequency (max) (kHz)	115
Features	Adjustable switching frequency, Current limiting, Green mode, High-voltage startup, Input line monitor, Integrated Switch, IoT compatible, Leading edge blanking, Light-load efficiency, Soft start, Thermal shutdown
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Control mode	Current, Primary-side regulation, Voltage
Duty cycle (max) (%)	99