UCC28720是TI公司的一款反激式控制器产品,UCC28720是具有初级侧调节功能的恒压、恒流控制器,本页介绍了UCC28720的产品说明、应用、特性等,并给出了与UCC28720相关的TI元器件型号供参考。
UCC28720 - 具有初级侧调节功能的恒压、恒流控制器 - 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)
- < 10-mW No-Load Power
- Primary-Side Regulation (PSR) Eliminates Opto-Coupler
- ±5% Voltage and Current Regulation Across Line and Load
- 700-V Start-Up Switch
- 80-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs
- Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency
- Wide VDD Range Allows Small Bias Capacitor
- Dynamic BJT Drive
- Overvoltage, Low-Line, and Overcurrent Protection Functions
- Programmable Cable Compensation
- 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 UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.
An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.
Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor 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. Protection features help keep primary and secondary component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be programmed with an external resistor.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
UCC28720 | SOIC (7) | 3.91 mm × 4.90 mm |