UCC28720 - 具有初级侧调节功能的恒压、恒流控制器

UCC28720是TI德州仪器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，本站介绍了UCC28720的封装应用图解、特点和优点、功能等，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 - 德州仪器

产品特性

< 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

产品应用

USB-Compliant Adapters and Chargers for Consumer Electronics
- Smart phones
- Tablet computers
- Cameras
Standby Supply for TV and Desktop
White Goods

产品说明

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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
UCC28720	SOIC (7)	3.91 mm × 4.90 mm

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