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Texas Instruments UCC28740 | Demoboard PMP40183
UCC28740 Constant-Voltage Constant-Current Flyback Controller Using Optocoupled Feedback
Overview
| Topology | Flyback Converter |
| Input voltage | 85-265 V |
| Switching frequency | 100 kHz |
| Output 1 | 5.05 V / 2.2 A |
| IC revision | PMP40183 |
Description
The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. Constant-Current (CC) regulation is accomplished through Primary-Side Regulation (PSR) techniques. This device processes information from opto-coupled feedback and an auxiliary flyback winding for precise high-performance control of output voltage and current. An internal 700-V startup switch, dynamically controlled operating states, and a tailored modulation profile support ultra-low standby power without sacrificing startup time or output transient response. Control algorithms in the UCC28740 allow operating efficiencies to meet or exceed applicable standards. 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 100 kHz and always maintains control of the peak-primary current in the transformer. Protection features keep primary and secondary component stresses in check. A minimum switching frequency of 170 Hz facilitates the achievement of less than 10-mW no-load power.
Features
- Less than 10-mW No-Load Power Capability
- Optocoupled Feedback for CV, and Primary-Side Regulation (PSR) for CC
- Enables ±1% Voltage Regulation and ±5% Current Regulation Across Line and Load
- 700-V Startup Switch
- 100-kHz Maximum Switching Frequency Enables High-Power-Density Charger Designs
- Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
- Frequency Dithering to Ease EMI Compliance
- Clamped Gate-Drive Output for MOSFET
- Overvoltage, Low-Line, and Overcurrent Protection Functions
- SOIC-7 Package
- Create a Custom Design Using the UCC28740 With the WEBENCH® Power Designer
Typical applications
- USB-Compliant Adapters and Chargers for Consumer Electronics, White Goods
- Standby Supply for TV and Desktop
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | ISAT,10%(A) | RDC max.(Ω) | Version | Interface Type | Gender | Pins | Mount | PCB Thickness(mm) | Working Voltage(V (DC)) | Packaging | L1(µH) | L2(µH) | IR(A) | IR 2(A) | ISAT(A) | RDC1 typ(Ω) | RDC2 typ(Ω) | RDC1 max(Ω) | RDC2 max(Ω) | fres(MHz) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TI Radial Leaded Wire Wound Inductor, 100 µH, 0.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | Inductance100 µH | Rated Current0.8 A | Saturation Current @ 10%0.8 A | DC Resistance0.65 Ω | VersionHeat Shrinking Tube | – | – | – | MountTHT | – | – | – | – | – | – | – | – | – | – | – | – | Self Resonant Frequency7.1 MHz | – | ||||
 | WE-DD SMT Shielded Coupled Inductor, 220 µH, 0.91 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-DD SMT Shielded Coupled Inductor | Inductance220 µH | Rated Current0.91 A | – | DC Resistance0.58 Ω | – | – | – | – | – | – | – | – | Inductance 1220 µH | Inductance 2220 µH | Rated Current0.91 A | Rated Current 20.91 A | Saturation Current1.6 A | DC Resistance 10.54 Ω | DC Resistance 20.54 Ω | DC Resistance 10.58 Ω | DC Resistance 20.58 Ω | Self Resonant Frequency2.8 MHz | TypeStraight | ||||
 | WR-USB Type C Connectors, –, 5 A | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Type C Connectors | – | Rated Current5 A | – | – | – | Interface TypeType C | GenderReceptacle | Pins24 | MountTHR | PCB Thickness1.6 mm | Working Voltage48 V (DC) | PackagingTape and Reel | – | – | – | – | – | – | – | – | – | – | TypeHorizontal |