UCC2889

更新时间： 2024-11-07 22:59:31

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
7页	456K
描述
Off-line Power Supply Controller

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UCC2889 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.

2/95

12 3 4 5 6 7

中文翻译

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UCC2889 替代型号

型号	品牌	替代类型	描述	数据表
UCC3889	TI	功能相似	Off-line Power Supply Controller

与UCC2889相关器件

型号	品牌	获取价格	描述	数据表
UCC2889D	TI	获取价格	Off-line Power Supply Controller
UCC2889DG4	TI	获取价格	Off-line Power Supply Controller
UCC2889DTR	TI	获取价格	Off-line Power Supply Controller
UCC2889DTR/81361G4	TI	获取价格	Off-line Power Supply Controller
UCC2889DTRG4	TI	获取价格	Off-line Power Supply Controller
UCC2889J	ETC	获取价格	Voltage-Mode SMPS Controller
UCC2889N	TI	获取价格	Off-line Power Supply Controller
UCC2889NG4	TI	获取价格	Off-line Power Supply Controller
UCC2890	TI	获取价格	Off-Line Battery Charger Circuit
UCC2891	TI	获取价格	CURRENT MODE ACTIVE CLAMP PWM CONTROLLER

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