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Overview
| Topology | Flyback Converter |
| Input voltage | 85-265 V |
| Output 1 | 5.25 V / 2.1 A |
| IC revision | B |
Description
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.
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
- Power Supply for Cable Modem, Television, SetTop Box, and Wireless Routers, AC-to-DC Power Supply for Appliances
- Industrial and Medical AC-to-DC Power Supplies, Smart Electricity Meters,Bias Supply for UPS, Server PSU, etc.
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 768772221 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-TI HV Radial Leaded Wire Wound Inductor (High Voltage) | 1.3 | 3.7 | 0.9 | 220 | 0.6 | – | – | – | 7.8 | 7.8 | 9.5 | THT | ||
 | 744822233 | SPEC PCN pendingDue to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff. | 11 files | Active i| Production is active. Expected lifetime: >10 years. | WE-CMB Common Mode Power Line Choke | – | – | 1.5 | 3300 | 0.12 | 250 | 1500 | MnZn | 17.5 | 13 | 22 | THT | ||
| 750317658 | SPEC | – | – | Active i| Production is active. Expected lifetime: >10 years. | Transformer | – | – | – | – | – | – | – | – | – | – | – | – |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 768772221 | SPEC | |
| 744822233 | SPEC PCN pendingDue to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff. | |
| 750317658 | SPEC | – |
| Samples |
|---|
| 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 |
|---|
