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UCC28740

更新时间： 2024-11-08 12:03:43
品牌 Logo 应用领域
德州仪器 - TI 光电控制器
页数 文件大小 规格书
32页 1315K
描述
Constant-Voltage Constant-Current Flyback Controller Using Opto-Coupled Feedback

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UCC28740  
www.ti.com  
SLUSBF3A –JULY 2013–REVISED JULY 2013  
Constant-Voltage Constant-Current Flyback Controller Using Opto-Coupled Feedback  
Check for Samples: UCC28740  
1
FEATURES  
DESCRIPTION  
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.  
•
•
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  
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.  
•
Resonant-Ring Valley-Switching Operation for  
Highest Overall Efficiency  
•
•
•
Frequency Dithering to Ease EMI Compliance  
Clamped Gate-Drive Output for MOSFET  
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.  
Overvoltage, Low-Line, and Overcurrent  
Protection Functions  
•
SOIC-7 Package  
APPLICATIONS  
•
USB-Compliant Adapters and Chargers for  
Consumer Electronics  
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.  
–
–
–
Smart Phones  
Tablet Computers  
Cameras  
•
•
Standby Supply for TV and Desktop  
White Goods  
TYPICAL V-I DIAGRAM  
SIMPLIFIED APPLICATION DIAGRAM  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2013, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
 
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与UCC28740相关器件

型号 品牌 获取价格 描述 数据表
UCC28740D TI

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 		Constant-Voltage Constant-Current Flyback Controller Using Opto-Coupled Feedback
UCC28740DR TI

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 		Constant-Voltage Constant-Current Flyback Controller Using Opto-Coupled Feedback
UCC28740-Q1 TI

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 		具有集成高压启动和光耦合器反馈功能的汽车类超低待机功耗反激式控制器
UCC28740QDRQ1 TI

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 		具有集成高压启动和光耦合器反馈功能的汽车类超低待机功耗反激式控制器 | D | 7 | -
UCC28742 TI

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 		具有 1% 输出调节精度的高效反激控制器
UCC28742DBVR TI

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 		具有 1% 输出调节精度的高效反激控制器 | DBV | 6 | -40 to 125
UCC28742DBVT TI

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 		具有 1% 输出调节精度的高效反激控制器 | DBV | 6 | -40 to 125
UCC28750 TI

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 		具有次级侧调节 (SSR) 功能、适用于离线应用的电流模式反激式控制器
UCC287502DBVR TI

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 		具有次级侧调节 (SSR) 功能、适用于离线应用的电流模式反激式控制器 | DBV | 6
UCC28780 TI

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 		1MHz 高频有源钳位反激式控制器

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