UCC2889NG4

更新时间： 2024-11-10 12:02:03

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
14页	1119K
描述
Off-line Power Supply Controller

阅读下载

中文翻译

获取价格

数据手册
替代型号

如果您发现信息不准确，欢迎纠错

UCC2889NG4 数据手册

UCC1889

UCC2889

UCC3889

Off-line Power Supply Controller

DESCRIPTION

FEATURES

•

Transformerless Off-line

Applications

The UCC1889 controller is optimized for use as an off-line, low power, low voltage,

regulated bias supply. The unique circuit topology utilized in this device can be

visualized as two cascaded flyback converters, each operating in the discontinu-

ous mode, and both driven from a single external power switch. The significant

benefit of this approach is the ability to achieve voltage conversion ratios of 400V

to 12V with no transformer and low internal losses.

•

Ideal Primary-side Bias Supply

Efficient BiCMOS Design

Wide Input Range

The control algorithm utilized by the UCC1889 is to force the switch on time to be

inversely proportional to the input line voltage while the switch off time is made in-

versely proportional to the output voltage. This action is automatically controlled by

an internal feedback loop and reference. The cascaded configuration allows a volt-

age conversion from 400V to 12V to be achieved with a switch duty cycle greater

than 10%. This topology also offers inherent short circuit protection since as the

output voltage falls to zero, the switch off time approaches infinity.

Fixed or Adjustable

Low Voltage Output

•

Uses Low Cost SMD Inductors

Short Circuit Protected

Optional Isolation Capability

The output voltage can be easily set to 12V or 18V. Moreover, it can be pro-

grammed for other output voltages less than 18V with a few additional compo-

nents. An isolated version can be achieved with this topology as described further

in Unitrode Application Note U-149.

OPERATION

With reference to the application diagram below, when input voltage is first applied,

the RON current into TON is directed to VCC where it charges the external capacitor,

C3, connected to VCC. As voltage builds on VCC, an internal undervoltage lockout

holds the circuit off and the output at DRIVE low until VCC reaches 8.4V. At this

time, DRIVE goes high turning on the power switch, Q1, and redirecting the current

into TON to the timing capacitor, CT. CT charges to a fixed threshold with a current

ICHG=0.8 • (VIN - 4.5V)/RON. Since DRIVE will only be high for as long as CT

charges, the power switch on time will be inversely proportional to line voltage.

This provides a constant line voltage-switch on time product.

TYPICAL APPLICATION

UDG-93060-1

Note: This device incorporates patented technology used under license from Lambda Electronics, Inc.

SLUS158A - FEBRUARY 1995 - REVISED FEBRUARY 2003

12 3 4 5 6 7...14

中文翻译

下载PDF

UCC2889NG4 替代型号

型号	品牌	替代类型	描述	数据表
UCC3889NG4	TI	完全替代	Off-line Power Supply Controller
UCC3889N	TI	功能相似	Off-line Power Supply Controller
UCC2889N	TI	功能相似	Off-line Power Supply Controller

与UCC2889NG4相关器件

型号	品牌	获取价格	描述	数据表
UCC2890	TI	获取价格	Off-Line Battery Charger Circuit
UCC2891	TI	获取价格	CURRENT MODE ACTIVE CLAMP PWM CONTROLLER
UCC28910	TI	获取价格	High-Voltage Flyback Switcher with Primary-Side Regulation and Output Current Control
UCC28910_15	TI	获取价格	High-Voltage Flyback Switcher with Primary-Side Regulation and Output Current Control
UCC28910D	TI	获取价格	High-Voltage Flyback Switcher with Primary-Side Regulation and Output Current Control
UCC28910DR	TI	获取价格	High-Voltage Flyback Switcher with Primary-Side Regulation and Output Current Control
UCC28911	TI	获取价格	High-Voltage Flyback Switcher with Primary-Side Regulation and Output Current Control
UCC28911D	TI	获取价格	High-Voltage Flyback Switcher with Primary-Side Regulation and Output Current Control
UCC28911DR	TI	获取价格	High-Voltage Flyback Switcher with Primary-Side Regulation and Output Current Control
UCC2891D	TI	获取价格	CURRENT MODE ACTIVE CLAMP PWM CONTROLLER

与UCC2889NG4相关文章

英伟达新AI芯片Rubin或提前半年亮相
2024-11-05

24
苹果iPhone 17将全系采用三星/LG显示LTPO OLED面板
2024-11-05

24
三星深化印度制造布局，供应链本地化进程加速
2024-10-29

50
芯擎科技“星辰一号”自动驾驶芯片点亮成功，2025年量产在即
2024-10-29

40

产品中心

服务支持

精选活动

关于我们

帮助中心

UCC2889NG4

UCC2889NG4 数据手册

UCC2889NG4 替代型号

与UCC2889NG4相关器件

与UCC2889NG4相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

UCC2889NG4

UCC2889NG4 数据手册

UCC2889NG4 替代型号

与UCC2889NG4相关器件

与UCC2889NG4相关文章

您还可以找

您在本页遇到什么问题？