UCC28740DR
Power Management - Specialized
Technical Specifications
| Type | Description |
|---|---|
| Working Voltage V | 22 V |
| Switching Freq Hz | 50.085 kHz |
| Voltage - Breakdown | 700V |
| Duty Cycle(Max) | - |
| Working Mode | DCM |
| Feedback System | Secondary-Side Feedback |
| Operating Temp | -40°C ~ +125°C |
| Type | Description |
|---|---|
| Output Current | - |
| Pd W | - |
| Features | Constant Current Mode (CC);Constant Voltage (CV);Over Voltage Protection;Over Current Protection;Overtemperature protection (OTP);Short Circuit Protection |
| Topology | Flyback |
| Output Voltage | - |
| Package / Case | SOIC-7 |
Product Introduction
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
Applications
- - USB-Compliant Adapters and Chargers for Consumer Electronics - Smart Phones Tablet Computers Cameras - Standby Supply for TV and Desktop - White Goods
Datasheet
Alternative Parts
Common UCC28740DR alternatives overseas buyers search for:
Compliance & Export Codes
| Type | Details |
|---|---|
| RoHS | ROHS3 |
| ECCN | EAR99 |
| CNHTS | 8542399000 |
| USHTS | 8542390001 |
| TARIC | 8542399000 |
| Type | Details |
|---|---|
| CAHTS | 8542390000 |
| BRHTS | 85423999 |
| INHTS | 85423900 |
| MXHTS | 8542.39.99 |
Sourcing Information
Sourcing UCC28740DR from China? SZ Procure helps international buyers navigate the Shenzhen electronics market and locate suitable supplier options for specific component requirements.
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