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Texas Instruments UCC28742DBVR | Demoboard PMP21462.1
High-Efficiency Flyback Controller with 1% Output regulation accuracy
Overview
| Topology | Flyback Converter |
| Input voltage | 85-265 V |
| Switching frequency | 0.2-65 kHz |
| Output 1 | 5 V / 2 A |
| IC revision | A |
Description
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.
Features
- 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
Typical applications
- 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
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | ISAT(A) | fres(MHz) | IR(A) | L(µH) | RDC max.(Ω) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TI HV Radial Leaded Wire Wound Inductor (High Voltage), 1.3 A, 3.7 MHz | Status Activei| Production is active. Expected lifetime: >10 years. | Saturation Current1.3 A | Self Resonant Frequency3.7 MHz | Rated Current0.9 A | Inductance220 µH | DC Resistance0.6 Ω | – | – | – | Length7.8 mm | Width7.8 mm | Height9.5 mm | MountTHT | |||||
 | WE-CMB Common Mode Power Line Choke, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | – | – | Rated Current1 A | Inductance5000 µH | DC Resistance0.22 Ω | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length15 mm | Width7.8 mm | Height18 mm | MountTHT | ||||
750317656 | Transformer, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Transformer | – | – | – | – | – | – | – | – | – | – | – | – |