UCC28742 Texas instruments

UCC28742

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UCC28742

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Описание

The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flyback power-supply controller that provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. This device processes information from opto-coupled feedback and an auxiliary flyback winding for high-performance control of output voltage and current. The UCC28742 employs advanced control algorithms to achieve high operating efficiency and performance. The drive output 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 controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitates the achievement of low no-load input power.

Opto-Coupled Feedback Enables up to 1% Regulation
Accurate Current Limit with Overload Timeout Protection and Delayed Hiccup Response
Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
80-kHz Maximum Switching Frequency
Frequency Dithering to Ease EMI Compliance
Clamped Gate-Drive Output for MOSFET
Ultra-Low Start-Up Current and Large VDD Hysteresis
- High Value Start-Up Resistor
- Low Bias Capacitance
Fault Protections
- Input Low Line
- Output Over-Voltage
- Over-Current
- Short-Circuit
SOT23-6 Package
Create a Custom Design Using the UCC28742 with the WEBENCH^® Power Designer

Topology	Flyback
Control mode	Secondary-side regulation
Duty cycle (max) (%)	99
Switching frequency (max) (kHz)	105
Features	Current limiting, DCM, Light-load efficiency, Overvoltage protection, SSR, Soft start, Valley switching
UVLO thresholds on/off (V)	22/7.7
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Gate drive (typ) (A)	0.03