Texas Instruments UCC28742DBVR | Demoboard PMP21462.1

Beschreibung

The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-sideregulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flybackpower-supply controller that provides Constant-Voltage (CV) using an optical coupler to improvetransient response to large-load steps. This device processes information from opto-coupledfeedback and an auxiliary flyback winding for high-performance control of output voltage andcurrent.The UCC28742 employs advanced control algorithms to achieve high operating efficiency andperformance. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode(DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primarycurrent-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load andline ranges.The controller has a maximum switching frequency of 80 kHz and always maintains controlof the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitatesthe achievement of low no-load input power.

Eigenschaften

• 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

Typische Anwendungen

• Smart Electricity Meters
• Industrial and Medical AC-to-DC Power Supplies,Bias Supply for UPS, Server PSU, etc.,Power Supply for Cable Modem, Television, SetTop Box, and Wireless Routers,AC-to-DC Power Supply for Appliances

Weiterführende Informationen

• Datenblatt
• Produktseite des IC-Herstellers