UCC2857N

更新时间： 2024-09-20 13:15:07

品牌	Logo	应用领域
德州仪器 - TI		调节器功率因数校正控制器
页数	文件大小	规格书
10页	129K
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中文翻译

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数据手册

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UCC2857N 数据手册

UCC1857

UCC2857

UCC3857

PRELIMINARY

Isolated Boost PFC Preregulator Controller

FEATURES

DESCRIPTION

• PFC With Isolation, V < V

The UCC3857 provides all of the control functions necessary for an Iso-

lated Boost PFC Converter. These converters have the advantage of trans-

former isolation between primary and secondary, as well as an output bus

voltage that is lower than the input voltage. By providing both power factor

correction and down conversion in a single power processing stage, the

UCC3857 is ideal for applications which require high efficiency, integration,

and performance.

• Single Power Stage

• Zero Current Switched IGBT

• Programmable ZCS Time

• Corrects PF to >0.99

The UCC3857 brings together the control functions and drivers necessary

to generate overlapping drive signals for external IGBT switches, and pro-

vides a separate output to drive an external power MOSFET which pro-

vides zero current switching (ZCS) for both the IGBTs. Full programmability

is provided for the MOSFET driver delay time with an external RC network.

ZCS for the IGBT switches alleviates the undesirable turn off losses typi-

cally associated with these devices. This allows for higher switching fre-

quencies, smaller magnetic components and higher efficiency. The power

factor correction (PFC) portion of the UCC3857 employs the familiar aver-

age current control scheme used in previous Unitrode controllers. Internal

circuitry changes, however, have simplified the design of the PFC section

and improved performance.

• Fixed Frequency, Average Current

Control

• Improved RMS Feedforward

• Soft Start

• 9V to 18V Supply V Range

• 20-Pin DW, N, J, and L Packages

(continued)

TYPICAL APPLICATION CIRCUIT

RECTIFIED

AC INPUT

BIAS

SUPPLY

OUT

–

FEEDBACK

CKT

REF

OPTO

PKLMT MOUT

IAC

CA–

CAO VIN

MOSDRV 14

IGDRV1 16

IGDRV2 18

DELAY 12

CRMS

UCC3857

10 VA–

11 VAO

REF

VREF

PGND

AGND

UDG-98065

02/99

12 3 4 5 6 7...10

中文翻译

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