UCC28740是TI公司的一款反激式控制器产品,UCC28740是具有光电耦合器反馈的恒压、恒流反激控制器,本页介绍了UCC28740的产品说明、应用、特性等,并给出了与UCC28740相关的TI元器件型号供参考。
UCC28740 - 具有光电耦合器反馈的恒压、恒流反激控制器 - 反激式控制器 - 离线隔离型DC/DC控制器和转换器 - TI公司(Texas Instruments,德州仪器)
- Less than 10-mW No-Load Power Capability
- Opto-Coupled 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
- USB-Compliant Adapters and Chargers for Consumer Electronics
- Smart Phones
- Tablet Computers
- Cameras
- Standby Supply for TV and Desktop
- White Goods
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.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
UCC28740 | SOIC (7) | 4.90 mm × 3.91 mm |