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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 | Product series | L (µH) | IR (A) | ISAT (A) | RDC max. (Ω) | Version | Application | Interface Type | Gender | Pins | Mount | 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 7447462101 | SPEC | 8 files | WE-TI Radial Leaded Wire Wound Inductor | 100 | 0.8 | 0.8 | 0.65 | Heat Shrinking Tube | – | – | – | – | THT | – | – | – | – | – | – | – | – | – | – | – | 7.1 | – | ||
 | 744873221 | SPEC | 8 files | WE-DD SMT Shielded Coupled Inductor | 220 | 0.91 | 1.6 | 0.58 | – | – | – | – | – | – | – | – | 220 | 220 | 0.91 | 0.91 | 1.6 | 0.54 | 0.54 | 0.58 | 0.58 | 2.8 | Straight | ||
 | 632723300011 | SPEC | – | 6 files | WR-COM USB 3.1 Type C Receptacle Horizontal THR / SMT | – | 5 | – | – | – | USB 3.1 | Type C | Receptacle | 24 | THR | 20 | Tape and Reel | – | – | – | – | – | – | – | – | – | – | Horizontal |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 7447462101 | SPEC | |
| 744873221 | SPEC | |
| 632723300011 | SPEC | – |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Product series | L (µH) | IR (A) | ISAT (A) | RDC max. (Ω) | Version | Application | Interface Type | Gender | Pins | Mount | 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 |
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