UCC28740 - 具有光电耦合器反馈的恒压、恒流反激控制器

UCC28740是TI德州仪器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，本站介绍了UCC28740的封装应用图解、特点和优点、功能等，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 - 德州仪器

产品特性

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

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 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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
UCC28740	SOIC (7)	4.90 mm × 3.91 mm

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